Unsteady Phenomena in Turbomachinery.
ADVISORY GROUP FOR AEROSPACE RESEARCH AND DEVELOPMENT PARIS (FRANCE)
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In designing the blading of a compressor or turbine the airflow is assumed to be steady. In reality the flow must always be unsteady. Small-scale disturbances arise from the proximity of passing blades sometimes large scale disturbances result from distorted inlet flows. In a compressor, self-excited large scale disturbances may occur in the form of rotating stall. These unsteady effects are important because they may limit the range of efficient operation, or they may excite destructive blade vibrations. During recent years, improved instruments have enabled unsteady flows to be measured within cascades and turbomachines. The attention of the Meeting will be focussed on the improved understanding so obtained of the fluid mechanics of unsteady turbomachinery flows, the ways in which this understanding can be expressed in theoretical models, and the practical application of the research to turbomachinery design. Author
- Fluid Mechanics
- Jet and Gas Turbine Engines