Accession Number : ADA303614

Title :   Strut and Wall Interference on Jet-Induced Ground Effects of a STOVL Aircraft in Hover.

Descriptive Note : Master's thesis,

Corporate Author : NAVAL POSTGRADUATE SCHOOL MONTEREY CA

Personal Author(s) : Kristy, Michael H.

PDF Url : ADA303614

Report Date : SEP 1995

Pagination or Media Count : 92

Abstract : A small scale ground effect test rig was used to study the ground plane flow field generated by a STOVL aircraft in hover. The objective of the research was to support NASA-Ames Research Center planning for the Large Scale Powered Model (LSPM) test for the ARPA-sponsored ASTOVL program. Specifically, small scale oil flow visualization studies were conducted to make a relative assessment of the aerodynamic interference of a proposed strut configuration and a wall configuration on the ground plane stagnation line. A simplified flat plate model representative of a generic jet-powered STOVL aircraft was used to simulate the LSPM. Cold air jets were used to simulate both the lift fan and the twin rear engines. Nozzle Pressure Ratios were used that closely represented those used on the LSPM tests. The flow visualization data clearly identified a shift in the stagnation line location for both the strut and the wall configuration. Considering the experimental uncertainty, it was concluded that either the strut configuration or the wall configuration caused only a minor aerodynamic interference.

Descriptors :   *WALLS, *VERTICAL TAKEOFF AIRCRAFT, *STRUTS, *SHORT TAKEOFF AIRCRAFT, GROUND LEVEL, POSITION(LOCATION), RATIOS, UNCERTAINTY, LOW TEMPERATURE, AIRCRAFT, AIR FLOW, JET ENGINES, FLOW VISUALIZATION, FLOW FIELDS, CONFIGURATIONS, PRESSURE, AERODYNAMIC FORCES, INTERFERENCE, ENGINES, NOZZLES, SIMPLIFICATION, JET FLOW, HOVERING, FLAT PLATE MODELS, STAGNATION, GROUND EFFECT, LIFT FANS.

Subject Categories : V/STOL

Distribution Statement : APPROVED FOR PUBLIC RELEASE