Accession Number : ADA118819

Title :   Efficiency Improved Turboprop.

Descriptive Note : Technical memo.,

Corporate Author : PENNSYLVANIA STATE UNIV UNIVERSITY PARK APPLIED RESEARCH LAB

Personal Author(s) : Gearhart,W S

PDF Url : ADA118819

Report Date : 10 Jun 1982

Pagination or Media Count : 29

Abstract : Renewed attention has been focused on the efficiency of aircraft propulsion as the cost of fuel has risen. Studies conducted by NASA (1) to obtain fuel efficient aircraft have considered relatively highly-loaded turbo-prop systems. The disc loadings of these propellers are as much as four times higher than those on present turboprop aircraft. The higher disc loadings result in greater slipstream swirl and higher energy losses. Of primary importance is the radial distribution of the energy losses across the slipstream due to the tangential and axial velocities. This study presents the results of analysis defining the various sources of energy loss resulting from a swirling slipstream downstream of a propeller. Experimental data are presented demonstrating the presence of such losses and a propeller configuration discussed which offers improved propulsive performance when relatively highly-loaded propellers are employed. (Author)

Descriptors :   *Turboprop engines, *Fuel consumption, *Aircraft, *Propellers, Thrust, Downstream flow, Slipstream, Kinetic energy, Efficiency, Losses, Coefficients, Predictions

Subject Categories : Aircraft
      Fluid Mechanics
      Fuels
      Jet and Gas Turbine Engines

Distribution Statement : APPROVED FOR PUBLIC RELEASE