Optimal circumferential placement of cylindrical thermocouple probes for reduction of excitation forces

Journal Article · Thu Apr 01 00:00:00 EST 1993 · Journal of Engineering for Gas Turbines and Power; (United States)

DOI:https://doi.org/10.1115/1.2906725· OSTI ID:6348460

Cobb, E C; Cheu, T C; Hoffman, J ^[1]

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1. Textron Lycoming, Stratford, CT (United States)

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.

• OSTI ID: 6348460
• Journal Information: Journal of Engineering for Gas Turbines and Power; (United States), Vol. 115:2; ISSN 0742-4795
• Country of Publication: United States
• Language: English

Related Subjects

33 ADVANCED PROPULSION SYSTEMS
GAS TURBINE ENGINES
MECHANICAL VIBRATIONS
MONITORING
FINITE DIFFERENCE METHOD
OPTIMIZATION
THERMOCOUPLES
TURBINE BLADES
CALCULATION METHODS
ENGINES
HEAT ENGINES
INTERNAL COMBUSTION ENGINES
ITERATIVE METHODS
MEASURING INSTRUMENTS
NUMERICAL SOLUTION
330103* - Internal Combustion Engines- Turbine