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.
Discharge Coefficients of a Preswirl System in Secondary Air Systems
Contributed by the International Gas Turbine Institute and presented at the 46th International Gas Turbine and Aeroengine Congress and Exhibition, New Orleans, Louisiana, June 4–7, 2001. Manuscript received by the International Gas Turbine Institute February 2001. Paper No. 2001-GT-122. Review Chair: R. Natole.
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Dittmann, M., Geis , T., Schramm , V., Kim , S., and Wittig, S. (February 1, 2001). "Discharge Coefficients of a Preswirl System in Secondary Air Systems ." ASME. J. Turbomach. January 2002; 124(1): 119–124. https://doi.org/10.1115/1.1413474
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