The Boeing Company
LOW PRESSURE DIFFERENTIAL EJECTOR PUMP UTILIZING A LOBED, AXISYMMETRIC NOZZLE

Abstract:

An ejector including a mixing section; an inlet to the mixing section, the inlet comprising a first wall; a nozzle disposed in the inlet; the nozzle comprising the second wall defining a first channel through the nozzle, wherein the first wall and the second wall define a second channel through the inlet, the second wall has a trailing edge and a curved surface including a varying radius of curvature defining depressions extending to the trailing edge, a first flow of a first fluid into the second channel creates a pressure in the mixing section that draws a second flow of a second fluid through the first channel and into the mixing section, and the first flow and the second flow interact along the curved surface including the depressions and the trailing edge, forming a mixture comprising the first fluid and the second fluid. An outlet from the mixing section outputs the mixture, wherein the flow is well mixed and contains significant amounts of each fluid.