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Response of a Thin Airfoil Encountering a Strong Density Discontinuity

Marble, F. E. (1993) Response of a Thin Airfoil Encountering a Strong Density Discontinuity. Journal of Fluids Engineering, 115 (4). pp. 580-589. ISSN 0098-2202. doi:10.1115/1.2910183.

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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, Glauert (1929), Burgers (1935), Theodorsen (1935), Kussner (1936), Karman and Sears (1938), Kinney and Sears (1975). 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-uniformaties in temperature or composition, of a size comparable to the blade chord. This condition existsfor turbine blades, Marble (1975), Giles and Krouthen (1988), 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, Wortman (1975), 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. Dedicated to Professor W. R Sears on the occasion of his 80th birthday. Contributed by the Fluids Engineering Division for publication in the JOURNAL OF FLUIDS ENGINEERING. Manuscript received by the Fluids Engineering Division June 29, 1993; revised manuscript received September 23, 1993. Associate Technical Editor: D. P. Telionis.
Group:Guggenheim Jet Propulsion Center
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Guggenheim Jet Propulsion Center360
Issue or Number:4
Record Number:CaltechAUTHORS:20101123-132225533
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Official Citation:Response of a Thin Airfoil Encountering a Strong Density Discontinuity F. E. Marble, J. Fluids Eng. 115, 580 (1993), DOI:10.1115/1.2910183
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:20991
Deposited By: Ruth Sustaita
Deposited On:24 Nov 2010 19:12
Last Modified:09 Nov 2021 00:05

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