AN ANALYTICAL METHOD OF DETERMINING GENERAL DOWNWASH FLOW FIELD PARAMETERS FOR V/STOL AIRCRAFT

Abstract

This report presents a method of analytically determining the general downwash flow field parameters of various types of V/STOL aircraft. The basic difference between the operation of V/STOL aircraft and conventional aircraft is their method of take-off and landing. During these operations, V/STOL aircraft produce high downwash air velocities that impinge and spread out over the surface of the ground. Depending on the size, type, and number of engines on the aircraft, this downwash can cause damage to nearby aircraft, equipment, or personnel. Past theoretical methods based on incompressible flow theory have been unsuccessful in establishing a means of computing this downwash flow field. A combined method, however, of proven experimental data and certain analytical approaches have yielded a useful means of predicting the general downwash flow field parameters. This report presents these approaches and demonstrates their usefulness.

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Document Details

Document Type
Technical Report
Publication Date
Nov 01, 1966
Accession Number
AD0809185

Entities

People

  • David J. Hohler

Organizations

  • Air Force Research Laboratory

Tags

Communities of Interest

  • Air Platforms

DTIC Thesaurus Topics

  • Aircraft Equipment
  • Aircrafts
  • Airframes
  • Downwash
  • Dynamic Pressure
  • Experimental Data
  • Flow Fields
  • Fluid Flow
  • Gas Flow
  • Helicopters
  • Incompressible Flow
  • Jet Aircraft
  • Pressure Distribution
  • Propulsion Systems
  • Short Takeoff Aircraft
  • Static Pressure
  • Turbulent Mixing

Readers

  • Aviation Safety and Air Traffic Management
  • Fluid Mechanics and Fluid Dynamics.
  • Systems Analysis and Design