IL43402A

IL43402A - An ejector apparatus and a method for flowing fluid therethrough

Info

Publication number: IL43402A
Application number: IL43402A
Authority: IL
Original assignee: Rockwell International Corp
Priority date: 1972-11-30
Filing date: 1973-10-08
Publication date: 1976-03-31
Also published as: IL43402A0; BR7309301D0; GB1447523A; JPS4983200A; DE2359562A1; SE394728B; JPS5743479B2; IT1003547B; FR2209413A5; AU6104473A; CA981918A; ES420255A1

Claims

CLAIMS:

1. In ejector apparatus Immersed In a body of secondary flow fluid and producing an augmented thrust vector oriented aleng an ejector longitudinal axis, in combination: perimeter injector means having opposed discharge slots that are positioned at opposite sides of said longitudinal axis and that are oriented and sized to each discharge primary fluid flowed therethrough 1n a direction toward and substantially at right angles to said longitudinal axis at a discharge velocity greater than" approximately 0.7 Mach number; convergent Inlet surfaces each extending from Immediately adjacent a respective one of said perimeter Injector means opposed discharge slots and continuing 1n the direction of fluid flow along said long1£ud1 nal axis through a rotational angle 1n the range of approximately 80° to 110° to form an ejector apparatus throat having a minimum dimension D In a direction normal to said longitudinal axis; center Injector means having a discharge nozzle that 1s positioned Intermediate said perimeter Injector means discharge slots and above said ejector apparatus throat minimum dimension D and that Is oriented and sized to discharge primary fluid flowed therethrough 1n a direction generally along said longitudinal axis at a discharge velocity greater than approximately 0.7 Mach number; divergent diffuser surfaces continuing from said convergent Inlet surfaces 1n the region of said ejector apparatus throat minimum dimension D to a termination at an Interface with said body of secondary flow fluid and with an 43402/2 average divergence with respect to each other of angl e 2 * ; and duct means flowing high energy primary flow fluid to said perimeter Injector means discharge slots and to said center Injector means discharge nozzle at pressure ratios greater than approximately 1.3 relative to said body of secondary flow fluid and at flow rates sufficient for maintaining said discharge velocities, said perimeter Injector means opposed discharge slots and said divergent dlffuser surfaces termination being separated In a direction along said longitudinal axis by a distance L that 1s less than approximately 2.5 times said ejector apparatus throat minimum dimension D, and said divergent dlffuser surfaces average divergence angle 2« being at least approximately 15*,

2. The apparatus defined by claim 1 wherein said opposed discharge slots each have a height H 1n the direction of said ejector longitudinal axis and wherein said convergent Inlet surfaces each have a mean radius of curvature R for said rotational angle, said height H and said radius of curvature R being 1n a ratio substantially 1n the range of from 1:5 to 1:15,

3. The apparatus defined by claim 1 wherein said divergent dlffuser surfaces termination 1s separated from said perimeter Injector means opposed discharge slots in a direction along said longitudinal axis by a distance L that 1s substantially less than approximately 2.0 times said ejector apparatus throat minimum dimension D.

4. The apparatus defined by claim 1 wherein said duct means high energy primary flow fluid is proportioned with approximately from 30% to 70¾ being flowed to said center Injector means and the balance being flowed to said perimeter Injector means. 43402/2

5. The apparatus defined by claim 4 wherein said duct means high energy primary flow fluid 1s proportioned with approximately 50¾ being flowed to said center Injector means and the balance being flowed to said perimeter Injector means.

6. The apparatus defined by claim 1 wherein said divergent dlffuser surfaces average divergence angle 2« 1s at least approximately 24°.

7. A method of augmenting the thrust of a primary fluid flow 1n ejector apparatus which 1s Immersed 1n a body of secondary fluid and which has Joined 1n succession along a longitudinal axis a convergent Inlet section* a throat section of minimum dimension 0 In a direction normal to said longitudinal axis, and a divergent dlffuser section, comprising the steps of: njecting part of said primary fluid flow nto said ejector apparatus 1n a direction generally along said longitudinal axis as a free core Jet centrally of a secondary fluid Inlet opening 1n said convergent Inlet section and generally from above and toward said throat section at a discharge velocity greater than approximately 0.7 Mach number and entraining and mixing secondary fluid flowed through said Inlet opening Into and with primary fluid from said free core jet; simultaneously injecting the balance of said primary fluid flow Into said ejector apparatus 1n a direction generally at right angles to said longitudinal axis as will jets and from opposite sides of said secondary fluid nle opening 1n said convergent Inlet section, toward said longitudinal axis, and at discharge velocities greater than approximately 0.7 Mach number over opposed curved Inlet surfaces in said convergent nlet section adjacent thereto, 43402/2 turning said primary fluid flow Injected as well jets over said curved nlet surfaces 1n said convergent Inlet section and entraining and mixing additional secondary fluid flowed through said secondary fluid Inlet opening 1n said convergent Inlet section Into and with the primary fluid of said wall jets; diffusing said free core jet and wall jet primary fluid flow and entrained and mixed secondary fluid 1n said ejector apparatus Intermediate opposed wall surfaces extending from said throat section and defining said divergent dlffuser section; and discharging said diffused free core jet and wall Jet primary fluid flow and entrained and mixed secondary fluid from said ejector apparatus and Into said body of secondary fluid a distance from the region at which said primary fluid flow 1s Injected Into said ejector apparatus that 1s 1n the direction of said longitudinal axis greater than approximately 1.0 times but less than approximately 2.5 times said throat section minimum dimension D, said primary fluid flow and entrained and mixed secondary fluid thereby having a thrust at the region of discharge into said body of secondary fluid at least 50% greater 1n magnitude than the magnitude of thrust of said primary fluid flow.

8. The method defined by claim 7 wherein said primary fluid flow Injected as a free core jet and as wall jets 1s Injected Into said ejector apparatus at a pressure ratio of approximately 1.3 or greater with respect to the pressure of said body of secondary fluid. 43 402/2 ^

9. The method d

10. The method defined by claim 7 wherein said primary fluid flow Injected Into said ejector apparatus Is proportioned n a manner whereby approximately from 302 to 70% 1a Injected as said free core jet and the balance 1s Injected as said wall jets.

11. The method deflnddcby claim 7 wherein sa d primary fluid flow Injected Into said ejector apparatus 1s proportioned 1n a ' manner whereby approximately 50% Is njected as said free core jet and the balance 1s Injected as said wall jets.

12. The method defined by claim 7 wherein said primary fluid flow Injected as wall jets 1s turned over said opposed curved Inlet surfaces In said convergent Inlet section through an angle 1n the range of approximately from 30° to 110°.

13. The method defined by claim 7 wherein said primary fluid flow Injected as wall jets 1s turned over said opposed curved Inlet surfaces 1n said convergent Inlet section through an angle n the range of approximately from 80° to 110°.

14. The method defined by claim 7 wherein said free core jet and wall jet primary fluid flow and entrained and mixed secondary fluid 1s diffused Intermediate opposed wall surfaces extending from said throat section that diverge with respect to each other through an average angle that 1s at least approximately 15°.

15. The method defined by claim 7 wherein said free core jet and wall jet primary fluid flow and entrained and mixed secondary fluid s diffused Intermediate opposed wall surfaces extending from said throat section that diverge with respect to each other