CN103487254B - A kind of test unit with controllable frequency pressure oscillation mechanism - Google Patents
A kind of test unit with controllable frequency pressure oscillation mechanism Download PDFInfo
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- CN103487254B CN103487254B CN201310321550.9A CN201310321550A CN103487254B CN 103487254 B CN103487254 B CN 103487254B CN 201310321550 A CN201310321550 A CN 201310321550A CN 103487254 B CN103487254 B CN 103487254B
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Abstract
The invention discloses a kind of test unit with controllable frequency pressure oscillation mechanism, comprise pressure oscillation mechanism, experimental cabin and be arranged at gas regulation case between the two.Pressure oscillation mechanism comprises bent axle and several piston cylinders; Piston rod, the throw-out lever that can move reciprocatingly are set in this piston cylinder; Spring is provided with between piston rod and throw-out lever, between throw-out lever and piston cylinder.Crankshaft and piston bar is connected with connecting rod by rod journal; One end of bent axle connects motor by shaft coupling, and the other end is fixed with axle sleeve.The side plate of experimental cabin is provided with draft tube and escape pipe; This escape pipe passes from the through hole of gas regulation case side; Gas regulation case is provided with several the first circular ventholes away from one end of experimental cabin.Adopt said structure, throw-out lever can this first circular venthole of periodic intermittent shutoff, realize the adjustment of pressure oscillation in experimental cabin and oscillation frequency, impermeability good and can be suitable for high pressure, easily to process, test accuracy is high, easy to maintenance.
Description
Technical field
The present invention relates to a kind of test unit, can be applicable to the research fields such as internal combustion engine, rocket engine, gas turbine, boiler and gas jet technique; Particularly a kind of test unit with controllable frequency pressure oscillation mechanism.
Background technology
Engine is chemical energy fuel combustion discharged is the device that can utilize mechanical energy, fuel atomization is very complicated physical and chemical process with burning, it comprises heat transfer, mass transfer, the process that fluid flowing and chemical kinetic reaction etc. carry out simultaneously, particularly combustion instability impact is very large on engine performance for this process, combustion instability can run in each reseach of engine process, all types of combustion instability all characterizes with the pressure vibration of room, firing chamber, so the fuel atomizing under pressure oscillation environment, combustion mechanism research is significant in reseach of engine process, propellant spray atomization wherein under pressure oscillation environment, combustion by evaporation experimental study is the key link of reseach of engine process, by the fuel atomization under pressure oscillation environment, burning test, obtain gas-liquid spray atomization, combustion by evaporation characteristic and the response pattern to pressure oscillation thereof, thus accurate assurance fuel atomization, combustion process and rule thereof, disclose the main excitation mechanism of the generation of engine unstable combustion, for suppression combustion instability, improve engine performance significant.
In pressure oscillation test, pressure oscillation device is vital equipment.According to thermodynamics the Ideal-Gas Equation
that is: 1 known, the method changing closed container gas pressure intensity has three kinds, changes the temperature of confining gas.2, confining gas volume is changed.3, confining gas density or quality is changed.First method changes its pressure change by the change of gas temperature, and the scope of pressure oscillation and frequency depend on scope and the frequency of temperature variation, and this way implements and is not easy to.Second method reaches the object changing confining gas pressure by the volume changing gas, although this method impermeability easily ensures, the compression and expansion of gas needs powerful power-equipment, implements also more difficult.The third method makes gas pressure intensity change by continuous inflation/deflation, and this method implements fairly simple.
The existing method realizing pressure oscillation by the third method has two kinds, one is rotating type change valve, it is characterized in that on rotor, design several through holes, by the rotation of rotor, gas piping is switched on and off, realize the rapid translating of air-flow, thus realize the pressure oscillation in experimental cabin; Another kind is gear type reversal valve, namely blocks and opens gas piping gas port by the gear teeth intermittence of high-speed rotary gear, thus realize the pressure oscillation in experimental cabin.
Although above two kinds of method structures are simple, need power little, but rotor or gear are due to architectural feature own, when contacting with gas piping, can not realize sealing completely, even if when part mechanical machining precision is higher, can not avoid the gas leak phenomenon in the course of work, experimental precision is low, and test pressure is higher, test effect is poorer, and high pressure can not use substantially; In addition, because this pressure oscillation structure is directly connected with experimental cabin, if there is fault, must experimental cabin be stopped, maintenance, change more inconvenient.
Summary of the invention
The technical problem to be solved in the present invention is for above-mentioned the deficiencies in the prior art, and provide that a kind of frequency is controlled, impermeability good, high pressure can be suitable for, easily processing, test accuracy be high, the test unit with controllable frequency pressure oscillation mechanism easy to maintenance.
For solving the problems of the technologies described above, the technical solution used in the present invention is:
There is a test unit for controllable frequency pressure oscillation mechanism, comprise pressure oscillation mechanism, experimental cabin and be arranged at gas regulation case between the two; The side plate of described experimental cabin is provided with draft tube and escape pipe; Described gas regulation case is provided with a through hole near one end of experimental cabin, and described escape pipe passes from this through hole; Gas regulation case is provided with several the first circular ventholes away from one end of experimental cabin; Can this first circular venthole of periodic intermittent shutoff during described pressure oscillation mechanism motion.
Described pressure oscillation mechanism comprises bent axle and several piston cylinders; The piston rod that can move reciprocatingly and throw-out lever is provided with in this piston cylinder; Can the circular venthole of shutoff first during the motion of this throw-out lever; Between described piston rod and throw-out lever, between throw-out lever and piston cylinder, be provided with spring; Described crankshaft and piston bar is connected with connecting rod by rod journal; One end of described bent axle is connected with motor by shaft coupling, and the other end is fixed with axle sleeve.
Described gas regulation case has silencer box away from the arranged outside of experimental cabin; This silencer box comprises the first circular venthole shared with gas regulation case, gas outlet and the second circular venthole corresponding with the first circular venthole position; This second circular venthole allows piston cylinder to extend there through.
Described throw-out lever is greater than the area of the first circular venthole near the area of the end face of the first circular venthole.
The quantity of described piston cylinder, rod journal, connecting rod, piston rod and throw-out lever is three.
Described first circular venthole and the second circular venthole quantity are three.
Described gas regulation case and silencer box are structure as a whole, and the side plate with the first circular venthole is be arranged on the baffle plate in this integrative-structure.
After the present invention adopts said structure, above-mentioned throw-out lever can the first circular venthole on periodic intermittent ground shutoff gas regulation case, makes the air-flow rapid translating in experimental cabin, thus realizes the pressure oscillation in experimental cabin; By adjusting the quantity of motor speed or the first circular venthole and throw-out lever etc., the adjustment of pressure oscillation frequency can be realized.Throw-out lever is greater than the area of the first circular venthole near the area of the end face of the first circular venthole, therefore under the promotion of motor and spring etc., can realize sealing completely, good airproof performance, test accuracy is high, can be suitable for high-pressure situations; And not high to the processing request of the parts such as throw-out lever, gas regulation case, easily process, separately this oscillating mechanism is arranged on outside experimental cabin, easy-maintaining, replacing, after closing the gas control valve on escape pipe, experimental cabin environment is unaffected, can quick-recovery test soon.
Accompanying drawing explanation
Fig. 1 is the structural representation that the present invention has the test unit of controllable frequency pressure oscillation mechanism;
Fig. 2 is the inner structure schematic diagram of oscillating mechanism in the present invention (not containing silencer box);
Fig. 3 is the schematic diagram of bent axle in the present invention;
Fig. 4 is the schematic diagram of connecting rod in the present invention;
Fig. 5 is the schematic diagram of piston cylinder in the present invention;
Fig. 6 is the schematic diagram of throw-out lever in the present invention;
Fig. 7 is the schematic diagram of piston rod in the present invention;
Fig. 8 is gas regulation case in the present invention, silencer box vertical view and the cut-open view along silencer box A-A face.
Wherein have: 1. pressure oscillation mechanism; 2. gas regulation case; 3. experimental cabin; 4. axle sleeve; 5. bent axle; 6. shaft coupling; 7. motor; 8. piston rod; 9. spring; 10. throw-out lever; 11. draft tube; 12. silencer boxs; 13. escape pipes; 14. piston cylinders; 15. connecting rods; 16. rod journals; 17. first circular ventholes; 18. second circular ventholes; 19. gas outlets; 20. end faces.
Embodiment
Below in conjunction with accompanying drawing and concrete preferred implementation, the present invention is further detailed explanation.
As shown in Figure 1, a kind of test unit with controllable frequency pressure oscillation mechanism, the casing comprising pressure oscillation mechanism 1, experimental cabin 3 and arrange between the two; This casing is divided into gas regulation case 2 and silencer box 12 by the one piece of baffle plate axially arranged in casing; The side plate of experimental cabin 3 is provided with draft tube 11 and escape pipe 13; Described gas regulation case 2 is provided with a through hole near one end of experimental cabin, and described escape pipe 13 passes from this through hole; Above-mentioned baffle plate is provided with 3 the first circular ventholes 17; As shown in Figure 2, can this first circular venthole 17 of periodic intermittent shutoff when described pressure oscillation mechanism 1 is moved.
As shown in Figure 2, described pressure oscillation mechanism 1 comprises bent axle 5(specifically as shown in Figure 3) and 3 piston cylinder 14(are specifically as shown in Figure 5); The piston rod 8(that can move reciprocatingly is provided with concrete as shown in Figure 7 in this piston cylinder 14) and throw-out lever 10(is specifically as shown in Figure 6); Can the circular venthole 17 of shutoff first when this throw-out lever 10 moves; Between described piston rod 8 and throw-out lever 10, between throw-out lever 10 and piston cylinder 14, be provided with spring 9; Described bent axle 5 is concrete as shown in Figure 4 with connecting rod 15(by rod journal 16 with piston rod 8) be connected; One end of described bent axle 5 is connected with motor 7 by shaft coupling 6, and the other end is fixed with axle sleeve 4.
Above-mentioned pressure oscillation mechanism 1 also can be can the change-over valve of the circular venthole 17 of periodic intermittent shutoff first; as rotor or gear wheel reversing valve; but the area of each rotor or gear all should be greater than the area of this first circular venthole 17, and this change is also within protection scope of the present invention.
On above-mentioned silencer box 12, be provided with gas outlet 19 and the second circular venthole 18 corresponding with the first circular venthole 17 position; This second circular venthole 18 allows piston cylinder 14 to extend there through.
Above-mentioned throw-out lever 10 is greater than the area of the first circular venthole 17 near the area of the end face 20 of the first circular venthole 17.
During test, first in experimental cabin 3, fill the gas of required condition, in cabin 3 to be tested, pressure reaches and after being stabilized in predetermined value, switches on power, motor 7 is with dynamic crankshaft 5 to swing, and bent axle 5 drives piston rod 8 to do reciprocating in piston cylinder 14 by connecting rod 15.Open and adjust the gas regulation valve on tracheae 13, make the flow of draft tube 11 and gas outlet 19 equal (because gas regulation case 2 volume is much smaller than the volume of experimental cabin 3, therefore when opening the gas control valve on escape pipe 13, pressure change in experimental cabin 3 is very little or substantially constant), when the rod journal 16 on bent axle 5 turns near piston cylinder 14 one end, piston rod 8 promotes throw-out lever 10 by spring 9 and moves right, two springs 9 are all compressed, throw-out lever 10 termination is made to be close to gas regulating the qi flowing in the channels case 2 wall (i.e. baffle plate), block the first circular venthole 17 on wall, stop venting, when the rod journal 16 on bent axle 5 turns to away from piston cylinder 14 one end, two springs 9 are upheld, and under the effect of spring 9, separately, the first circular venthole 17 starts venting for throw-out lever 10 end face 20 and gas regulating box 2 wall.
When rod journal 16 turns to again near piston cylinder 14 one end, above action will be repeated, throw-out lever 10 end face 20 and gas regulating box 2 wall is so just made periodically to be adjacent to and to separate, thus make the first circular venthole 17 intermittence block and open, realize the change in oscillation to gaseous mass in experimental cabin 3, thus cause the change in oscillation of gas pressure intensity in experimental cabin 3.
During test, by adjusting the rotating speed of motor 7 or adjusting the quantity of rod journal 16, piston cylinder 14, connecting rod 15, piston rod 8, the circular venthole 17 of throw-out lever 10, first and the second circular venthole 18, to reach required oscillation frequency; Therefore the change that the quantity of piston cylinder 14, connecting rod 15, piston rod 8, the circular venthole 17 of throw-out lever 10, first and the second circular venthole 18 is arranged; all within protection scope of the present invention; throw-out lever 10 is when end face 20 area is greater than first circular venthole 17; also can be square or rectangle, but be not limited thereto.
In addition, install encapsulant additional at the circular venthole 17 of end face 20, first of throw-out lever 10 and the second circular venthole 18 place, the soundproof effect of silencer box 12 will be better, can provide a comparatively quietly working environment for experimenter.
Claims (6)
1. there is a test unit for controllable frequency pressure oscillation mechanism, it is characterized in that: the gas regulation case (2) comprising pressure oscillation mechanism (1), experimental cabin (3) and be arranged between the two; The side plate of described experimental cabin (3) is provided with draft tube (11) and escape pipe (13); Described gas regulation case (2) is provided with through hole near one end of experimental cabin (3), and described escape pipe (13) passes from this through hole; Gas regulation case (2) is provided with several the first circular ventholes (17) away from one end of experimental cabin (3); Can this first circular venthole (17) of periodic intermittent shutoff during described pressure oscillation mechanism (1) motion; Described pressure oscillation mechanism (1) comprises bent axle (5) and several piston cylinders (14); The piston rod (8) and throw-out lever (10) that can move reciprocatingly is provided with in this piston cylinder (14); Can the circular venthole of shutoff first (17) during this throw-out lever (10) motion; Spring (9) is provided with between described piston rod (8) and throw-out lever (10), between throw-out lever (10) and piston cylinder (14); Described bent axle (5) is connected with connecting rod (15) by rod journal (16) with piston rod (8); One end of described bent axle (5) is connected with motor (7) by shaft coupling (6), and the other end is fixed with axle sleeve (4).
2. the test unit with controllable frequency pressure oscillation mechanism according to claim 1, is characterized in that: described gas regulation case (2) has silencer box (12) away from the arranged outside of experimental cabin (3); This silencer box (12) comprises the first circular venthole (17) total with gas regulation case (2), gas outlet (19) and the second circular venthole (18) corresponding with the first circular venthole (17) position; This second circular venthole (18) allows piston cylinder (14) to extend there through.
3. the test unit with controllable frequency pressure oscillation mechanism according to claim 1, it is characterized in that: described throw-out lever (10) stretches out piston cylinder (14) away from one end of bent axle (5), end face (20) area of this end is greater than the area of the first circular venthole (17).
4. the test unit with controllable frequency pressure oscillation mechanism according to claim 1, is characterized in that: described piston cylinder (14), rod journal (16), connecting rod (15), piston rod (8) are three with the quantity of throw-out lever (10).
5. the test unit with controllable frequency pressure oscillation mechanism according to claim 2, is characterized in that: described first circular venthole (17) and the second circular venthole (18) quantity are three.
6. the test unit with controllable frequency pressure oscillation mechanism according to claim 2, it is characterized in that: described gas regulation case (2) and silencer box (12) are structure as a whole, the side plate with the first circular venthole (17) is be arranged on the baffle plate in this integrative-structure.
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| CN201310321550.9A CN103487254B (en) | 2013-07-29 | 2013-07-29 | A kind of test unit with controllable frequency pressure oscillation mechanism |
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| CN201310321550.9A CN103487254B (en) | 2013-07-29 | 2013-07-29 | A kind of test unit with controllable frequency pressure oscillation mechanism |
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| CN103487254B true CN103487254B (en) | 2015-09-30 |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105020051B (en) * | 2015-06-19 | 2017-04-05 | 中国人民解放军装备学院 | A kind of combustor acoustic investigation device |
| CN106769066B (en) * | 2017-01-12 | 2023-11-17 | 无锡帕捷科技有限公司 | Pulse pressure generator and pulse pressure testing device |
| CN113075353B (en) * | 2021-04-01 | 2022-03-29 | 上海交通大学 | Solid propellant combustion testing device |
| CN113045311B (en) * | 2021-05-13 | 2022-02-08 | 深圳市一诺牙科技术有限公司 | Color zirconia false tooth sintering method and color zirconia false tooth |
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| CN1167519A (en) * | 1994-09-29 | 1997-12-10 | 索尼克斯研究有限公司 | Charge conditioning system for enabling cold starting and running of spark-ignited, diesel piston engines |
| CN1651751A (en) * | 2003-12-30 | 2005-08-10 | 依维柯股份公司 | Gas engine ,cylinder head for a gas engine and its method of production and gas supply system |
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| WO2011128158A1 (en) * | 2010-04-13 | 2011-10-20 | Siemens Aktiengesellschaft | Resonator device for damping the pressure oscillation within a combustion chamber and a method for operating a combustion arrangement |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| DE602007004729D1 (en) * | 2007-09-11 | 2010-03-25 | Fiat Ricerche | Fuel injection device with a variable flow rate high pressure fuel pump |
| RU2508506C2 (en) * | 2009-09-01 | 2014-02-27 | Дженерал Электрик Компани | Method and unit for fluid feed in gas turbine engine combustion chamber |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1167519A (en) * | 1994-09-29 | 1997-12-10 | 索尼克斯研究有限公司 | Charge conditioning system for enabling cold starting and running of spark-ignited, diesel piston engines |
| CN1651751A (en) * | 2003-12-30 | 2005-08-10 | 依维柯股份公司 | Gas engine ,cylinder head for a gas engine and its method of production and gas supply system |
| CN1837593A (en) * | 2005-03-25 | 2006-09-27 | 株式会社丰田自动织机 | Homogeneous pneumatic compression ignition type engine |
| CN101457670A (en) * | 2007-12-14 | 2009-06-17 | 现代自动车株式会社 | Impulslader fur kraftfahrzeugmotoren |
| WO2011128158A1 (en) * | 2010-04-13 | 2011-10-20 | Siemens Aktiengesellschaft | Resonator device for damping the pressure oscillation within a combustion chamber and a method for operating a combustion arrangement |
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