Reduction of V/STOL Downwash Effects by Jet Exhuast Flow Control.
Final rept. Jul 73-Jun 74,
CIVIL ENGINEERING LAB (NAVY) PORT HUENEME CALIF
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The performance of VSTOL aircraft is influenced significantly by ground effects during landing and takeoff when the propulsive flow of the aircraft is directly dowward. To mitigate downwash effects, a new landing mat concept was developed at Civil Engineering Laboratory whereby exhaust flow is controlled by either a very thin array of diamond patterns or parallel ribs. The impinging jet flow aligns itself with the long axis of the grid pattern, expanding in two directions along a single line rather than radially outward over the plane of the ground. Grid height or thickness is small compared with jet diameter. A method for calculating grid height was developed by combining Froesslings solution for boundary layer thickness and Glauerts solution for wall jet thickness. Author
- Terminal Flight Facilities
- Jet and Gas Turbine Engines