Dynamic Digital Blade Row Compression Component Stability Model. Model Validation and Analysis of Planar Pressure Pulse Generation and Two-Stage Fan Test Data.
Abstract
The objectives of this study were to determine the range of validity of a Dynamic Digital Blade Row Compression Component Stability Computer Model by comparing the results of model simulations with previously obtained test data and to determine the manner in which a fan component responded to imposed unsteady aerodynamics by examining calculated parameters. Validation of the modeling technique was obtained by simulating a facility and test conditions where the response of a two-stage fan to planar waves was determined. The simulation of the two-stage fan component was carried out using a quasi one-dimensional, pitch line, blade-row by blade-row model which used blade-row loss coefficients and deviation angles determined from analysis of clean-inlet-flow test data. This model was ideally suited for studying the fan response to the planar waves produced by the Planar Pressure Pulse Generator, a device which produced highly planar waves with peak-to-peak fluctuations of 10-30 percent of the mean total pressure over a frequency range of 42 to 800 Hz. The results of the simulations showed that the model accurately reproduced the waveshape, amplitude, and phase of the experimentally determined fan inlet and exit pressures and the fan inlet flow up to 75 Hz where the need for including unsteady blade circulation effects on blade characteristics began to become apparent. Further, the blade row model showed accurate simulation of the pressures in the interconnecting ducts by reproducing the wave and its harmonics up to approximately 118 Hz where the length of the volumes becomes too large to provide proper spatial definition of the harmonics of the standing waves although the fundamental frequency is properly reproduced.
Document Details
- Document Type
- Technical Report
- Publication Date
- Aug 01, 1976
- Accession Number
- ADA032079
Entities
People
- G. G. Reynolds
- W. G. Steenken
Organizations
- General Electric