Lobed convergent/divergent supersonic nozzle ejector system

An ejector system comprising:

• a. a convergent/divergent nozzle adapted in size and shape to supersonically accelerate a primary flow passing through the nozzle, and
• b. 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;
• and
• ii. 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;
• and
• d. 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.

An ejector system comprising:

• a. a convergent/divergent nozzle adapted in size and shape to supersonically accelerate a primary flow passing through the nozzle, and
• b. 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, and
• d. 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°.

An ejector system comprising:

• a. a convergent/divergent nozzle configured to supersonically accelerate a primary flow passing through the nozzle;
• and
• b. 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, and
• d. 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.

An ejector system comprising:

• a. a nozzle configured to supersonically accelerate a primary flow passing through the nozzle;
• and
• b. 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;
• and
• e. the ejector shroud has a length to entrance diameter ratio from about 1 to about 3.5.

An ejector system comprising:

• a. a nozzle configured to supersonically accelerate a primary flow passing through the nozzle;
• and
• b. 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;
• and
• f. the inner wall angle of at least one of the inner walls is greater than 7°.