Accession Number : AD0475412


Title :   AN ANALYSIS OF GROUND EROSION CAUSED BY JET DOWNWASH IMPINGEMENT


Descriptive Note : Master's thesis


Corporate Author : NAVAL POSTGRADUATE SCHOOL MONTEREY CA


Personal Author(s) : Shuter, David V


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/475412.pdf


Report Date : Jan 1965


Pagination or Media Count : 112


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.


Descriptors :   *DOWNWASH , *VERTICAL TAKEOFF AIRCRAFT , MATHEMATICAL MODELS , EXPERIMENTAL DATA , HAZARDS , THEORY , THESES , BOUNDARY LAYER , TERRAIN , EROSION , FLOW FIELDS , AERODYNAMIC LOADING , PRESSURE , AERODYNAMIC CHARACTERISTICS , SAFETY , NOZZLES , LANDING FIELDS , DRAG , LIFT , EXHAUST NOZZLES , FLUID FLOW , JET AIRCRAFT , SHORT TAKEOFF AIRCRAFT


Subject Categories : Fluid Mechanics


Distribution Statement : APPROVED FOR PUBLIC RELEASE