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Response of a Thin Airfoil Encountering a Strong Density Discontinuity

Marble, Frank E. (1993) Response of a Thin Airfoil Encountering a Strong Density Discontinuity. Journal of Fluids Engineering, 115 (4). pp. 580-589. ISSN 0098-2202.

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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 [1,2,3,4,5,6]. In some instances, notably for airfoils 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 [7,8] immediately downstream of the main burner of a gas turbine engine where the density fluctuations of the order of 50% may occur. Disturbances of a somewhat smaller magnitude arise from the ingestion of hot boundary layers into fans [9] 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 we propose to calculate.

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Additional Information:©1993 The American Society of Mechanical Engineers. Received June 29, 193; revised September 23, 1993.
Group:Guggenheim Jet Propulsion Center
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Record Number:CaltechAUTHORS:20101122-104523778
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Official Citation:Response of a Thin Airfoil Encountering a Strong Density Discontinuity F. E. Marble pp. 580-589
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:20940
Deposited By: Ruth Sustaita
Deposited On:30 Nov 2010 21:46
Last Modified:26 Dec 2012 12:40

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