Theoretical Basis for Extrapolation of Calibration Data of PTC 6 Throat Tap Nozzles

[+] Author and Article Information
J. W. Murdock

Drexel University, Philadelphia, PA 19104

D. R. Keyser

Naval Air Development Center, Warminster, PA 18974

J. Eng. Gas Turbines Power 113(2), 228-232 (Apr 01, 1991) (5 pages) doi:10.1115/1.2906549 History: Received July 01, 1990; Online April 24, 2008


Equations for the extrapolation of calibration data for ASME/PTC 6 throat tap nozzles are derived from boundary layer theory. The results match published coefficients with a maximum difference of +0.03 percent. It is also shown that the effects of transition in the boundary layer extend to throat Reynolds numbers in excess of 10,000,000, far beyond the capacity of any known calibration laboratory. The present PTC 6 requirement that calibration data must be in the fully turbulent range cannot be met with current facilities.

Copyright © 1991 by The American Society of Mechanical Engineers
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