Recent advances in jet ejectors operating under static conditions have produced high thrust augmentation that is feasible for application to V/STOL 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 V/STOL 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.
Analysis and Design of Ejector Diffuser for Optimum Thrust
1976
31 pages
Report
No indication
English
Jet & Gas Turbine Engines , Fluid Mechanics , Thrust augmentation , Ejectors , Diffusers , Vertical takeoff aircraft , Numerical methods and procedures , Finite difference theory , Pressure distribution , Turbulent boundary layer , Compressible flow , Optimization , Flow fields , Aerodynamic configurations , Design criteria
Thrust Augmentation Using Mixer-Ejector-Diffuser Systems
British Library Conference Proceedings | 1994
|Thrust Augmentation Using Mixer-Ejector-Diffuser Systems
British Library Conference Proceedings | 1994
|Thrust augmentation using mixer-ejector-diffuser systems
AIAA | 1994
|Analysis and design of ejector diffusor for optimum thrust
Tema Archive | 1976
|