An analysis of ground erosion caused by jet downwash impingement
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Authors
Shuter, David V.
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1965
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Monterey, CA; Naval Postgraduate School
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Abstract
Recent interest in military VTOL/STOL aircraft employing unprepared landing sites has led to interest in the problem of landing surface erosion. Surface erosion is caused by the aerodynamic forces on ground particles existing within the flow field of an impinging jet. The inviscid flow field is discussed and the viscous ground boundary layer is analyzed utilizing both theory and available experimental data. A mathematical model of the process of entrainment of ground particles is constructed. Erosion rates in the form of erosion profiles are predicted for selected jet configuration and types of terrain. A criterion for entrainment, due to both lift and drag, was found and presented for selected distances from the jet centerline.
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This publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States.