Accession Number : ADA325840

Title :   An Analytical Solution of Lift Loss for a Round Platform with a Central Lifting Jet.

Descriptive Note : Technical rept.,

Corporate Author : NAVAL AIR DEVELOPMENT CENTER WARMINSTER PA AIRCRAFT AND CREW SYSTEMS TECHNOLO GY DIRECTORATE

Personal Author(s) : Yen, K. T.

PDF Url : ADA325840

Report Date : 10 MAR 1980

Pagination or Media Count : 46

Abstract : An analysis of the lift loss for a round planform fitted with a centrally located round jet is presented. The pressure distribution over the lower surface of the planform is solved analytically by matching an inner viscous solution with an outer potential solution. By comparing the calculated pressure distributions with NACA experimental data, satisfactory agreement has been obtained, although the planforms are not exactly the same. In addition, Wyatt's formula for the lift loss is found to be essentially valid, but only under limited conditions, and an improved formula is suggested. Additional works, both experimental and theoretical, needed to solve the lift loss problem are discussed with recommendations.

Descriptors :   *PRESSURE DISTRIBUTION, *HOVERING, *VERTICAL TAKEOFF AIRCRAFT, *SHORT TAKEOFF AIRCRAFT, *PLANFORM, LOSSES, VISCOSITY, REYNOLDS NUMBER, LIFTING BODIES.

Subject Categories : Aerodynamics
      V/STOL
      Fluid Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE