Accession Number:

AD0847214

Title:

Unsteady Propeller Loading--Measurement, Correlation With Theory, and Parametric Study

Descriptive Note:

Research and development rept.

Corporate Author:

DAVID W TAYLOR NAVAL SHIP RESEARCH AND DEVELOPMENT CENTER BETHESDA MD DEPT OF HYDROMECHANICS

Report Date:

1968-10-01

Pagination or Media Count:

92.0

Abstract:

Objectives of the present study are to measure the unsteady forces and moments on a series of marine propellers due to circumferentially nonuniform inflow to correlate the measured unsteady thrust and torque with calculated values, based on various proposed theories and to investigate variation of unsteady thrust and torque over a range of pertinent parameters, using the method determined from those described to be the best available for calculating unsteady loading. Experimental blade-frequency thrust and torque were compared with values calculated by the following techniques quasi-steady, two-dimensional unsteady, combination quasi-steady two-dimensional unsteady, and three-dimensional unsteady. The three-dimensional unsteady theory yields the best correlation with experiment however, the numerical techniques employed breakdown for narrow-bladed propellers and for propellers with blade overlap.

Subject Categories:

  • Marine Engineering
  • Mechanics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE