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RESEARCH PAPERS

Optimal Circumferential Placement of Cylindrical Thermocouple Probes for Reduction of Excitation Forces

[+] Author and Article Information
E. C. Cobb, T.-C. Cheu, J. Hoffman

Textron Lycoming, Stratford, CT 06497

J. Eng. Gas Turbines Power 115(2), 418-423 (Apr 01, 1993) (6 pages) doi:10.1115/1.2906725 History: Received February 11, 1992; Online April 24, 2008

Abstract

This paper presents a design methodology to determine the optimal circumferential placement of cylindrical probes upstream of a turbine stage for reduced excitation forces. The potential flow forcing function generated by the probes is characterized by means of a Fourier analysis. A finite difference formulation is used to evaluate the sensitivity of the forcing function to the probe positions. An optimization scheme, based on the linear programming method, uses the sensitivity analysis results to reposition the probes such that the Fourier amplitudes of critical excitation orders are reduced. The results for a sample design situation are presented.

Copyright © 1993 by The American Society of Mechanical Engineers
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