Parametric Study of Ejector-Cooled Turbine Engine Compartment Using CFD Mike Kazlauskas

Overview Modeling turbine engine compartment using CFD Uses ejector arrangement for compartment cooling- High speed, primary flow entrains secondary flow Runs will be 2D, axisymmetric. Profile of compartment is created and virtually revolved around centerline Trying to determine effects of compartment cooling flow and exhaust loss on cooling inlet size, ejector gap size, and primary nozzle velocity

Compartment Schematic

Compartment Mesh and Control Volume

Mesh Closeup- Ejector Gap Detail

Compartment Geometry Turbine Exit Plane Primary Nozzle Mixing Duct Cooling Inlet

Geometry Sizes Mixing Duct Sizing Primary Nozzle Sizing

Sample Run- Contours of Velocity (ft/s)

Secondary Flow vs. Ejector Gap Size

Full Result Summary

Run Summary

Conclusions Smallest primary nozzle with large mixing duct produced highest overall secondary flow, however exhaust loss was twice as high as other configurations Constant area primary nozzle with large mixing duct produced relatively high secondary flow with significantly lower losses than small nozzle configuration Configurations with inadequate ejector gap area are limited to the maximum amount of secondary flow regardless of complartment cooling inlet area