An Attempt to Correlate Normal Vorticities with Total Pressure Distortion Patterns at the Entrance to a Gas Turbine Engine.

摘要

An attempt is made to predict the worst-case pressure distortion produced by a distortion screen at the entrance to a gas turbine engine using only steady-state total pressure measurements. The vector sum of radial and circumferential vorticity, called normal vorticity, is compared to both the difference between steady-state and worst-case distortion patterns, and the standard deviation of the high response pressure measurements, called turbulence. Average values of turbulence and vorticity are found to be unrelated to the increase in distortion between steady-state and worst-case pressure measurements. Probe-by-probe analysis of the data indicates that a correlation may exist between vorticity and the distortion increase. Although a final prediction technique is not developed, an improved test program and refined data analysis techniques are outlined. (Author)