Accession Number : AD0740170

Title :   The Response of a Propulsor to Random Velocity Fluctuations,

Corporate Author : PENNSYLVANIA STATE UNIV UNIVERSITY PARK ORDNANCE RESEARCH LAB

Personal Author(s) : Sevik,Maurice M.

Report Date : 30 APR 1970

Pagination or Media Count : 19

Abstract : The response of a propulsor to random velocity fluctuations is analyzed. As a special case, the theory is used to predict the force fluctuations on a low-solidity propeller having blades of high aspect ratio and operating in a homogeneous, isotropic turbulence field. The response is studied with respect to two functions that involve the ratios of the propeller diameter and of the chord of the blades to a characteristic length scale of the energy containing eddies. Experiments were performed in a water tunnel with a free-stream propeller placed downstream of grids of various mesh sizes, with good agreement between theoretical predictions and experimental results.

Descriptors :   (*TURBINE BLADES, RESPONSE), VELOCITY, ANALYSIS OF VARIANCE, TURBULENCE, WATER TUNNELS, MODEL TESTS, EXPERIMENTAL DATA, FORCE(MECHANICS), CORRELATION TECHNIQUES

Subject Categories : Fluid Mechanics
      Jet and Gas Turbine Engines

Distribution Statement : APPROVED FOR PUBLIC RELEASE