AN ANALYSIS OF GROUND EROSION CAUSED BY JET DOWNWASH IMPINGEMENT

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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Document Details

Document Type
Technical Report
Publication Date
Jan 01, 1965
Accession Number
AD0475412

Entities

People

  • David V. Shuter

Organizations

  • Naval Postgraduate School

Tags

Communities of Interest

  • Air Platforms
  • Materials and Manufacturing Processes

DTIC Thesaurus Topics

  • Aerodynamic Forces
  • Aircrafts
  • Boundaries
  • Boundary Layer
  • Computational Fluid Dynamics
  • Dynamic Pressure
  • Experimental Data
  • Flow
  • Flow Fields
  • Fluid Dynamics
  • Fluid Flow
  • Fluid Mechanics
  • Hydrodynamics
  • Inviscid Flow
  • Layers
  • Pressure Distribution
  • Turbulent Flow

Readers

  • Aerospace Engineering
  • Fluid Mechanics and Fluid Dynamics.
  • Wetland-Land-Environmental Management.