Response of a thin airfoil encountering strong density discontinuity
- California Inst. of Tech., Pasadena, CA (United States). Karman Lab. of Fluid Mechanics
Airfoil theory for unsteady motion has been developed extensively assuming the undisturbed medium to be of uniform density, a restriction accurate for motion in the atmosphere. In some instances, notably for airfoil comprising fan, compressor and turbine blade rows, the undisturbed medium may carry density variations or ``spots``, resulting from non-uniformities in temperature or composition, of a size comparable to the blade chord. This condition exists for turbine blades, immediately downstream of the main burner of a gas turbine engine where the density fluctuations of the order of 50 percent may occur. Disturbances of a somewhat smaller magnitude arise from the ingestion of hot boundary layers into fans, and exhaust into hovercraft. Because these regions of non-uniform density convect with the moving medium, the airfoil experiences a time varying load and moment which the authors calculate.
- Sponsoring Organization:
- USDOE
- OSTI ID:
- 143848
- Journal Information:
- Journal of Fluids Engineering, Vol. 115, Issue 4; Other Information: PBD: Dec 1993
- Country of Publication:
- United States
- Language:
- English
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