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An ejector system comprises a lobed, supersonic primary nozzle and a convergent/divergent ejector shroud. The lobed nozzle is just upstream from the ejector shroud, such that there is an annular space between the nozzle and shroud for admitting a secondary flow. In operation, a primary flow of high-

An ejector system comprises a lobed, supersonic primary nozzle and a convergent/divergent ejector shroud. The lobed nozzle is just upstream from the ejector shroud, such that there is an annular space between the nozzle and shroud for admitting a secondary flow. In operation, a primary flow of high-pressure steam or air is directed through the primary nozzle, where it is accelerated to supersonic speed. The primary flow then exits the primary nozzle, where it entrains and is mixed with the secondary flow, creating a low pressure region or vacuum. The ejector shroud subsequently decelerates the combined flow while increasing the flow pressure, which increases suction performance and reduces energy loss. Because the primary nozzle mixes the two flows, the ejector shroud is able to have a length-to-entrance-diameter ratio significantly smaller than typical shrouds/diffusers, which decreases the system's size and increases performance.

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1. An ejector system comprising:a. a convergent/divergent nozzle adapted in size and shape to supersonically accelerate a primary flow passing through the nozzle, andb. an ejector shroud generally coaxial with the nozzle, said nozzle and ejector shroud having a space there between for admitting a se

1. An ejector system comprising:a. a convergent/divergent nozzle adapted in size and shape to supersonically accelerate a primary flow passing through the nozzle, andb. an ejector shroud generally coaxial with the nozzle, said nozzle and ejector shroud having a space there between for admitting a secondary flow;c. wherein the convergent/divergent nozzle includes a plurality of lobes for mixing the primary flow with the secondary flow, said lobes having a lobe wall contouring in the divergent area region of the nozzle for enhancing both the nozzle flow expansion and the mixing of the primary flow with the secondary flow, andd. wherein the ejector shroud is adapted in size and shape to decelerate and increase the flow pressure of the mixed primary and secondary flows passing through the ejector shroud, said shroud having a length to entrance diameter ratio from about 1 to about 3.5.2. The ejector system of claim 1 wherein the ejector shroud has a length to entrance diameter ratio of about 3.5.3. The ejector system of claim 1 wherein the ejector shroud has an inner wall with an inner wall angle between 7° and about 20°.4. An ejector system comprising:a. a convergent/divergent nozzle adapted in size and shape to supersonically accelerate a primary flow passing through the nozzle, andb. an ejector shroud generally coaxial with the nozzle, said nozzle and ejector shroud having a space there between for admitting a secondary flow;c. wherein the convergent/divergent nozzle includes a plurality of lobes for mixing the primary flow with the secondary flow, said lobes having a lobe wall contouring in the divergent area region of the nozzle for enhancing both the nozzle flow expansion and the mixing of the primary flow with the secondary flow; wherein:i. the lobes define an exit area of the nozzle; andii. the exit area has a flow area substantially the same as a primary flow expansion area needed to generate a desired run suction pressure for the ejector system, whereby the secondary flow is caused to flow between the lobes for rapid mixing and passing through a larger pressure rise without separations; andd. wherein the ejector shroud is adapted in size and shape to decelerate and increase the flow pressure of the mixed primary and secondary flows passing through the ejector shroud.5. An ejector system comprising:a. a convergent/divergent nozzle adapted in size and shape to supersonically accelerate a primary flow passing through the nozzle, andb. an ejector shroud generally coaxial with the nozzle, said nozzle and ejector shroud having a space there between for admitting a secondary flow;c. wherein the convergent/divergent nozzle includes a plurality of lobes for mixing the primary flow with the secondary flow, said lobes having a lobe wall contouring in the divergent area region of the nozzle for enhancing both the nozzle flow expansion and the mixing of the primary flow with the secondary flow, andd. wherein the ejector shroud is adapted in size and shape to decelerate and increase the flow pressure of the mixed primary and secondary flows passing through the ejector shroud, said shroud having a plurality of inner walls each having an inner wall angle, wherein the inner wall angle of at least one of the inner walls is between 7° and about 20°.6. An ejector system for creating a low pressure and/or vacuum region by entraining a secondary flow with a primary flow, said ejector system comprising:a. a convergent/divergent nozzle adapted in size and shape to supersonically accelerate the primary flow passing through the nozzle and to mix the primary flow with the secondary flow, wherein the nozzle includes a plurality of lobes for mixing the primary flow with the secondary flow, said lobes having a lobe wall contouring in a divergent area region of the nozzle for enhancing both the nozzle flow expansion and the mixing of the primary flow with the secondary flow; andb. diffuser means generally coaxial with and spaced apart from the nozzle means to admit the secondary flow, said diffuser means for decelerating and increasing the flow pressure of the mixed primary and secondary flows, wherein the diffuser means is an ejector shroud having a length to entrance diameter ratio from about 1 to about 3.5.7. The ejector system of claim 6 wherein the diffuser means is an ejector shroud having a length to entrance diameter ratio of about 3.5.8. The ejector system of claim 6 wherein:a. the plurality of lobes define an exit area of the nozzle; andb. the exit area has a flow area substantially the same as a primary flow expansion area needed to generate a desired run suction pressure for the ejector system, whereby the secondary flow is caused to flow between the lobes for rapid mixing and passing through a larger pressure rise without separation.9. The ejector system of claim 8 wherein;a. the diffuser means is an ejector shroud having a plurality of inner walls each having an inner wall angle; andb. the inner wall angle of at least one of the inner walls is between 7° and about 20°.10. The ejector system of claim 6 wherein the diffuser means is an ejector shroud having an inner wall with an inner wall angle between 7° and about 20°.11. An ejector system comprising:a. a convergent/divergent nozzle configured to supersonically accelerate a primary flow passing through the nozzle; andb. an ejector shroud generally coaxial with the nozzle, said nozzle and said ejector shroud having a space there between for admitting a secondary flow;c. wherein the nozzle comprises a plurality of lobes for mixing the primary flow with the secondary flow, said lobes having a lobe wall contouring in a divergent area region of the nozzle for enhancing both the nozzle flow expansion and the mixing of the primary flow with the secondary flow, andd. wherein the ejector shroud is configured to decelerate and increase the flow pressure of the mixed primary and secondary flows passing through the ejector shroud, wherein the ejector shroud has a length to entrance diameter ratio from about 1 to about 3.5.12. The ejector system of claim 11 wherein the ejector shroud has a length to entrance diameter ratio of about 3.5.13. The ejector system of claim 11 wherein:a. the ejector shroud has a plurality of inner walls each having an inner wall angle; andb. the inner wall angle of at least one of the inner walls is greater than 7°.14. The ejector system of claim 11 wherein;a. the ejector shroud has a plurality of inner walls each having an inner wall angle; andb. the inner wall angle of at least one of the inner walls is between 7° and about 20°.15. The ejector system of claim 11 wherein the ejector shroud has an inner wall with an inner wall angle between 7° and about 20°.16. The ejector system of claim 11 wherein a round area encompassing all the lobes at an exit plane of the nozzle has a flow area sufficient to generate a desired run suction pressure for the ejector system.17. An ejector system comprising:a. a nozzle configured to supersonically accelerate a primary flow passing through the nozzle; andb. an ejector shroud generally coaxial with the nozzle, said nozzle and said ejector shroud having a space there between for admitting a secondary flow; wherein:c. the nozzle comprises a plurality of lobes for mixing the primary flow with the secondary flow;d. the ejector shroud is configured to decelerate and increase the flow pressure of the mixed primary and secondary flows passing through the ejector shroud; ande. the ejector shroud has a length to entrance diameter ratio from about 1 to about 3.5.18. An ejector system comprising:a. a nozzle configured to supersonically accelerate a primary flow passing through the nozzle; andb. an ejector shroud generally coaxial with the nozzle, said nozzle and said ejector shroud having a space there between for admitting a secondary flow; wherein:c. the nozzle comprises a plurality of lobes for mixing the primary flow with the secondary flow;d. the ejector shroud is configured to decelerate and increase the flow pressure of the mixed primary and secondary flows passing through the ejector shroud;e. the ejector shroud has a plurality of inner walls each having an inner wall angle; andf. the inner wall angle of at least one of the inner walls is greater than 7°.