Analysis and Design of Ejector Diffuser for Optimum Thrust,
DAVID W TAYLOR NAVAL SHIP RESEARCH AND DEVELOPMENT CENTER BETHESDA MD AVIATION AND SURFACE EFFECTS DEPT
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Recent advances in jet ejectors operating under static conditions have produced high thrust augmentation that is feasible for application to VSTOL flight. However, because of a loss in augmentation in duct flow, b ramjet effect, and c space limitations, high performance and compactness are required in the design of thrust-augmenting ejectors for VSTOL aircraft. An analytical inverse approach is presented in which the pressure distribution along the diffuser wall of an ejector is defined for a given entrance flow condition and the contour of the desired diffuser wall is determined by using a finite difference technique. The prescribed pressure distribution is first optimized by a modified Stratford criterion for incipient separation of turbulent boundary layers this optimization makes it applicable to compressible two-dimensional and axisymmetric flows.
- Fluid Mechanics
- Jet and Gas Turbine Engines