COMPUTER PROGRAM FOR REDUCING STATIC PROPELLER TEST DATA
Abstract
A computer program using a curve-fit technique was developed to reduce performance data obtained from static tests of aircraft propellers. The entire program is written in Fortran IV language for use on the IBM 7094 computer. The program accepts static whirl rig test data (ie, raw RPM, horsepower, and thrust data) obtained at a fixed blade angle and reduces it into pertinent propeller relationships. The program first reduces the test data into various coefficients and computes the propeller tip Mach number. A curve fit technique then fits running curves through the test thrust and horsepower data points at the test tip Mach numbers. Intermediate horsepower and thrust values are determined from the fitted curves at selected Mach number increments, and all coefficients are recomputed. This results in a presentation of the reduced data in two forms, coefficients computed from the actual test data and coefficients obtained at specific constant Mach number increments from the fitted curves. The data are presented in tabular printout form. This is a general program and is written so that the order of the curve fit, the Mach number increment, the number of test data points and the Mach number range can be varied. The entire program deck and all nonstandard subroutines are included. Detail instructions are provided which should allow the program to be used by technicians or students who are familiar with Fortran IV language.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jun 01, 1968
- Accession Number
- AD0675643
Entities
People
- Gerald T. Cafarelli
- Matthew H. Chopin