Test process and apparatus for treatment of jet engine exhaust
阅读：568发布：2021-09-20
专利汇可以提供Test process and apparatus for treatment of jet engine exhaust专利检索，专利查询，专利分析的服务。并且A process and apparatus for treating the exhausts of jet engines being tested on jet test stands is shown. A jet or spray of water is introduced to the surface of the exhaust stream serving at once to augment the exhaust and cool it. Substantially less augmentation air is therefore required to absorb the energy of the exhaust, the load on downstream pollution abatement equipment is lessened and the treated exhaust is at least partially condensible. In a preferred embodiment a portion of the exhaust gases that have been partially cooled by air and water augmentation are recycled and remixed with fresh exhaust gases and fresh augmentation air. This internal augmentation results in a decrease in external air augmentation. Also the recycle stream contains some unvaporized water which vaporizes under the conditions at the point of mixture. More efficient use of the augmentation water is thereby achieved with a further reduction in total flows. The augmentation apparatus in which the recycle is achieved comprises an augmenter shell having an annular inner shell having a diverging inner surface.，下面是Test process and apparatus for treatment of jet engine exhaust专利的具体信息内容。
1. A process for treating the hot exhaust gases from a jet engine mounted on a test stand comprising the steps of: introducing water to said exhaust gas in a mixing zone together with augmentation air; passing the mixture formed through an augmentation zone; and recycling a portion thereof back to the said mixing zone.
2. A process as recited in claim 1 wherein a second quantity of water is introduced into the gas passing through the said augmentation zone.
3. A process as recited in claim 1 wherein the gas from said augmentation zone is passed to a gas scrubbing zone for removal of pollutants therein.
4. A process for treating the hot exhaust gases from a jet engine mounted on a test stand comprising the steps of: introducing the hot exhaust stream into the converging section of a first shell open to the atmosphere at its upstream end and thereby inducing a flow of air into said first shell; introducing water to the mixture of said hot exhaust stream and induced air, in a mixing zone at the downstream end of said first shell; and then passing the mixture of exhaust gas, induced air and water into an augmenter zone comprising a tubular outer shell and a substantially concentric tubular inner shell shorter in length than said outer shell, said inner shell having an inner surface diverging outwardly from and along the central axis common to said tubular shells, whereby a portion of said mixture is recycled through the annular space between said shells to said mixing zone.
5. A process as recited in claim 4 wherein the water is supplied uniformly and radially inwardly into the mixture of exhaust and induced air at an angle of from 0* to 30* downstream from the vertical.
6. A process as recited in claim 5 wherein the water is supplied at a velocity of from 20 to 200 feet per second.
7. A process as recited in claim 4 wherein supplementary water is supplieD into the mixture passing through said inner tubular shell.
8. A process as recited in claim 4 wherein the angle of divergence of the inner surface of said inner tubular shell from said central axis is from 4* to 15*.
9. A process as recited in claim 4 wherein the angle of convergence of the inner surfaces of said first shell is from 15* to 45* and the diameter of the downsream end is from 1 inch to 15 inches greater than the maximum flame diameter of the jet engine exhaust.
10. A process as recited in claim 4 wherein an annular baffle is affixed, at its outer circumference, to the inner surface of said tubular outer shell at a position downstream of said tubular inner shell, in order to provide additional recycling of the mixture of exhaust gas, induced air and water.
11. An apparatus for treating the hot exhaust gases from a jet engine mounted on a test stand comprising the elements of: a converging section of a first shell; a jet engine positioned so that its exhaust is axially directed into said converging section thereby providing an annular air induction zone between said engine and the inner surfaces of said first shell; an outer tubular shell extending rearwardly from the outer circumference of said first shell; water supply means positioned within said outer tubular shell downstream of said first shell; and an inner tubular shell shorter in overall length than said outer tubular shell and positioned downstream of said water supply means and in substantially annular relation to said outer tubular shell, said inner tubular shell having an inner surface diverging outwardly from and along the central axis common to said tubular shells.
12. An apparatus as recited in claim 11 wherein said outer shell is cylindrical.
13. The apparatus of claim 11 wherein said water supply means are radially and uniformly positioned around the stream of jet engine exhaust and induced air passing through the downstream end of said first shell.
14. The apparatus of claim 13 wherein said spray means comprises a circular pipe having uniformly spaced holes drilled in the inner circumference thereof at angles of from 0* to 30* downstream from the vertical.
15. The apparatus of claim 13 wherein said spray means comprise uniformly spaced nozzles oriented at from 0* to 30* downstream from the vertical.
16. The apparatus of claim 11 wherein said inner tubular shell has water spray means associated with its inner surface.
17. The apparatus of claim 11 wherein the angle of divergence of the inner surface of said inner tubular shell from the central axis is from 4* to 15*.
18. An apparatus as recited in claim 11 wherein the angle of convergence of the inner surfaces of said first shell is from 15* to 45* and the diameter of the downstream end is from 1 inch to 15 inches greater than the maximum flame diameter of the jet engine exhaust.
19. An apparatus as recited in claim 11 having an annular baffle affixed at its outer circumference to the inner surface of said outer tubular shell at a position downstream of said inner tubular shell.
20. The apparatus of claim 19 wherein the ratio of the inner diameter of said baffle to the inner diameter of said outer tubular shell is from 0.8 to 1.0.
21. A jet engine exhaust augmentation unit comprising a longitudinally extending augmentation tube having an inlet for receiving the exhaust from a jet engine and an outlet, recycling means for returning a portion of the exhaust from the augmentation tube outlet for reintroduction into the inlet thereof for combination with the jet engine exhaust, and a water injection system for injecting water into the jet engine exhaust for lowering the temperature of the exhaust out of the augmentation tube outlet.
22. A jet engine exhaust augmentation unit according to claim 21 wherein the recycling means comprises a reTurn shroud having a forward coupling for close coupling a jet engine thereto in alignment with the augmentation tube.
23. A jet engine exhaust augmentation unit according to claim 22 wherein the forward coupling provides for introducing secondary augmentation air around the jet engine into the inlet of the augmentation tube.
24. A jet engine exhaust augmentation unit according to claim 21 further comprising augmentation air inlet means for introducing augmentation air into the inlet of the augmentation tube for combination with the jet engine exhaust.
25. A jet engine exhaust augmentation unit according to claim 24 wherein the total mass flow rate of the additional fluid introduced into the augmentation tube inlet is no less than the mass flow rate of the jet engine exhaust.
26. A jet engine exhaust augmentation unit according to claim 21 further comprising a rear discharge conduit having a forward inlet opening in alignment with the augmentation tube for discharging from the augmentation unit the remainder of the exhaust from the augmentation tube outlet.
27. A jet engine exhaust augmentation unit according to claim 26 wherein the augmentation tube comprises a rear divergent nozzle section with a rear outlet opening in alignment with the discharge conduit inlet opening.
28. A jet engine exhaust augmentation unit according to claim 27 wherein the rear outlet opening of the divergent nozzle section is larger than and is spaced forwardly of the forward inlet opening of the discharge conduit.
29. A jet engine exhaust augmentation unit according to claim 28 wherein the recycling means comprises an annular concave deflector for substantially reversing the flow of said returned portion of the exhaust from the augmentation tube outlet.
30. A jet engine exhaust augmentation unit according to claim 21 wherein the water injection system provides for injecting sufficient water to reduce the temperature of the jet engine exhaust out the augmentation tube outlet to approximately 212*F.
31. A jet engine exhaust augmentation unit according to claim 21 wherein the water injection system provides for injecting water into the augmentation tube for lowering the temperature of the jet engine exhaust.
32. A jet engine exhaust augmentation unit according to claim 21 wherein the water injection system provides for injecting water into said returned portion of the exhaust as it is returned for reintroduction to the tube inlet.
33. A turbojet engine exhaust augmentation unit for a turbojet engine test cell comprising a housing with an elongated shroud having a forward opening for receiving a turbojet engine and a rear discharge conduit with a forward inlet opening substantially larger than and in alignment with the rear exhaust opening of the turbojet engine, an elongated augmentation nozzle mounted within the shroud intermediate of and in alignment with the turbojet engine and discharge conduit and having a forward inlet opening for receiving the turbojet engine exhaust and a rear divergent nozzle section with a rear outlet opening in alignment with and forwardly of the discharge conduit inlet opening, the augmentation nozzle forming with the elongated shroud a substantially annular recirculating passage around the nozzle for returning a portion of the exhaust from the rear outlet opening of the nozzle to its forward inlet opening, and water injection means for injecting water into the engine exhaust for lowering the temperature of the exhaust out the rear nozzle outlet opening, the augmentaion nozzle being dimensioned so that the engine exhaust flow through the nozzle provides for drawing said returned exhaust portion into the nozzle inlet opening for augmentation of the engine exhaust.
34. A method of augmenting jet engine exhaust in a jet engine test cell for reducing the exhaust temperature and noise, comprising the steps of returning a portion of the jet exhaust from a relative downstream point for aspiration into the jet engine exhaust at a relative upstReam point for augmentation of the exhaust, and injecting water into the jet exhaust to form an exhaust and water mixture for cooling the exhaust and vaporizing the water at least in part and such that a jet exhaust and water mixture is aspirated into the jet exhaust at said relative upstream point.
35. A method of augmenting jet engine exhaust in a jet engine test cell according to claim 34 further comprising the step of aspirating augmentation air into the jet engine exhaust at a mass flow rate substantially less than the mass flow rate of the exhaust and water mixture aspirated into the jet engine exhaust.
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