The discharge behavior of a “direct-transfer” preswirl system has been investigated experimentally. The influences of the pressure ratio and the swirl ratio as well as the influence of the receiver and stator geometry were investigated. The discharge coefficients of the preswirl nozzles are given in the absolute frame of reference. The definition of the discharge coefficient of the receiver holes is applied to the rotating system in order to consider the work done by the rotor. Numerical calculations carried out for a free expansion through the stationary preswirl nozzles show very good agreement with experimental data.
Issue Section:
Technical Papers
1.
Scricca, J. A., and Moore, K. D., 1997, “Effects of ‘Cooled’ Cooling Air on Pre-Swirl Nozzle Design,” Tech. Rep. NASA/CP-98-208527, Pratt & Whitney, Oct.
2.
Meierhofer, B., and Franklin, C. J., 1981, “An Investigation of a Preswirled Cooling Airflow to a Turbine Disc by Measuring the Air Temperature in the Rotating Channels,” ASME Paper No. 81-GT-132.
3.
Samoilovich
, G. S.
, and Morozov
, B. I.
, 1957
, “Coefficients of Flow Through Pressure Equalizing Holes in Turbine Discs
,” Teploenergetica
, 8
, pp. 16
–23
.4.
Meyfarth
, P. F.
, and Shine
, A. J.
, 1965
, “Experimental Study of Flow Through Moving Orifices
,” ASME J. Basic Eng.
, 87
, pp. 1082
–1083
.5.
McGreehan
, W. F.
, and Schotsch
, M. J.
, 1988
, “Flow Characteristics of Long Orifices With Rotation and Corner Radiusing
,” ASME J. Turbomach.
, 110
, pp. 213
–217
.6.
Wittig, S., Kim, S., Scherer, T., Jakoby, R., and Weissert, I., 1995, “Durchfluß an rotierenden Wellen und Scheibenbohrungen und Wa¨rmeu¨bergang an rotierenden Wellen,” Forschungsvereinigung Verbrennungskraftmaschinen (FVV), Abschlußbericht, Vorhaben No. 465 and 536, Heft 574.
7.
El-Oun
, Z. B.
, and Owen
, J. M.
, 1988
, “Pre-Swirl Blade-Cooling Effectiveness in an Adiabatic Rotor–Stator System
,” ASME J. Turbomach.
, 111
, pp. 522
–529
.8.
Wilson
, M.
, Pilbrow
, R.
, and Owen
, J. M.
, 1997
, “Flow and Heat Transfer in a Pre-Swirl Rotor–Stator System
,” ASME J. Turbomach.
, 119
, pp. 364
–373
.9.
Popp
, O.
, Zimmermann
, H.
, and Kutz
, J.
, 1998
, “CFD Analysis of Coverplate Receiver Flow
,” ASME J. Turbomach.
, 120
, pp. 43
–49
.10.
Zimmermann, H., Kutz, J., and Fischer, R., 1998, “Air System Correlations: Part 2—Rotating Holes and Two Phase Flow,” ASME Paper No. 98-GT-207.
11.
Bragg
, S. L.
, 1960
, “Effect of Compressibility on the Discharge Coefficient of Orifices and Convergent Nozzles
,” J. Mech. Eng. Sci.
, 2
, No. 1
, pp. 35
–44
.Copyright © 2002
by ASME
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