Experimental Investigation of Aerodynamic Performance of a Turbine Cascade with Trailing-Edge Injection
Publication: Journal of Aerospace Engineering
Volume 30, Issue 6
Abstract
Trailing-edge mixing flows associated with coolant injection are complex and result in significant aerodynamics losses. A series of tests on a high-pressure turbine vane cascade with trailing-edge injection were conducted to study the effects of trailing-edge injection on the loss characteristics of the turbine profile. Wake traverses with a five-hole probe and tests of the static pressure distributions on the turbine profile were carried out for test Mach numbers of 0.7, 0.78, and 0.84 and injection mass-flow ratios of 0, 2, 3.6, and 5.5%. Wake total pressure losses and flow angles as well as pressure distributions on the turbine profile were compared with tests without trailing-edge injection, indicating a significant influence of trailing-edge injection on the profile wake development and its blockage effect on the vane passage flow. As the test Mach number increases, there are few variations in the flow angle downstream of the cascade without trailing-edge injection, but its circumferential unevenness is enhanced. Trailing-edge injection of 2% increases the static pressure value in the rear part of the vane suction side, and then reduces the vane loading, but causes increased wake losses at different test Mach numbers. However, the aerodynamic losses start to be reduced as the injection mass-flow ratio increases to 3.6%.
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Acknowledgments
This work has been supported by the National Natural Science Foundation of China (Grant No. 51406039) and the Natural Science Foundation of Heilongjiang Province of China (No. QC2016059), which are gratefully acknowledged.
References
Ames, F. E., Johnson, J. D., and Fiala, N. J. (2006). “The influence of aero-derivative combustor turbulence and Reynolds number on vane aerodynamic losses, secondary flows, and wake growth.” ASME Paper GT2006-90168, ASME, New York.
Aminossadati, S. M. (1999). “Simulation of aerodynamic loss for turbine blades with trailing-edge coolant ejection.” Ph.D. thesis, Univ. of Queensland, Brisbane, Australia.
Aminossadati, S. M., and Mee, D. J. (2013). “An experimental study on aerodynamic performance of turbine nozzle guide vanes with trailing-edge span-wise ejection.” ASME J. Turbomach., 135(3), 031002–031002.12.
Brundage, A. L., Zucrow, M. J., Plesniak, M. W., Lawless, P. B., and Ramadhyani, S. (2007). “Experimental investigation of airfoil trailing edge heat transfer and aerodynamic losses.” Exp. Therm. Fluid Sci., 31(3), 249–260.
Deckers, M., and Denton, J. D. (1997). “The aerodynamics of trailing-edge-cooled transonic turbine blades. 1—Experimental approach.” ASME Paper 97-GT-518, ASME, New York.
Denton, J. D., and Xu, L. (1990). “The trailing edge loss of transonic turbine blades.” ASME J. Turbomach., 112(2), 277–285.
Fiala, N. J., Johnson, J. D., and Ames, F. E. (2010). “Aerodynamics of a letterbox trailing edge: Effects of blowing rate, Reynolds number, and external turbulence on aerodynamic losses and pressure distribution.” ASME J. Turbomach., 132(4), 041011–041011.11.
Gao, J., Wei, M., Liu, Y. N., and Dong, P. (2017). “Experimental and numerical investigations of hole injection on the suction side throat of transonic turbine vanes in a cascade with trailing edge injection.” Proc. Inst. Mech. Eng. Part G: J. Aerosp. Eng., in press.
Kim, J. H., Kim, T. S., Lee, J. S., and Ro, S. T. (1996). “Performance analysis of a turbine stage having cooled nozzle blades with trailing edge ejection.” ASME Paper 96-TA-012, ASME, New York.
Mee, D. J., Baines, N. C., Oldfield, M. L. G., and Dickens, T. E. (1992). “An examination of the contributions to loss on a transonic turbine blade in cascade.” ASME J. Turbomach., 114(1), 155–162.
Pope, G. G. (1995). “Aeronautical technology—Recent advances and future prospects.” Aeronaut. J., 99(3), 81–89.
Rehder, H. J. (2009). “Investigation of trailing edge cooling concepts in a high pressure turbine cascade-aerodynamic experiments and loss analysis.” ASME Paper GT2009-59303, ASME, New York.
Rehder, H. J. (2012). “Investigation of trailing edge cooling concepts in a high pressure turbine cascade-aerodynamic experiments and loss analysis.” ASME J. Turbomach., 134(5), 051029–051029.11.
Saha, R., Fridh, J., Fransson, T. H., Mamaev, B. I., Annerfeldt, M., and Utriainen, E. (2014). “Shower head and trailing edge cooling influence on transonic vane aero performance.” ASME Paper GT2014-25613, ASME, New York.
Schobeiri, M. T., and Pappu, K. (1999). “Optimization of trailing edge ejection mixing losses: A theoretical and experimental study.” ASME J. Fluids Eng., 121(1), 118–125.
Schobeiri, T. (1989). “Optimum trailing edge ejection for cooled gas turbine blades.” ASME J. Turbomach., 111(4), 510–514.
Sun, D. W., Qiao, W. Y., Dong, K. T., and Xu, K. F. (2010). “Experimental investigation of aerodynamics of turbine blade trailing edge cooling.” J. Aerosp. Power, 25(5), 1097–1102 (in Chinese).
Telisinghe, J. C., Ireland, P. T., Jones, T. V., Barrett, D., and Son, C. (2006). “Comparative study between a cut-back and conventional trailing edge film cooling system.” ASME Paper GT2006-91207, ASME, New York.
Uzol, O., and Camci, C. (2001). “Aerodynamic loss characteristics of a turbine blade with trailing edge coolant ejection. 2—External aerodynamics, total pressure losses, and predictions.” ASME J. Turbomach., 123(2), 249–257.
Wang, Y. F., Zhou, X., Liu, X., and Wang, S. T. (2016). “Influence of trailing edge coolant ejection rate and cut-back length on energy loss and shockwave intensity of a transonic turbine blade.” ASME Paper GT2016-56859, ASME, New York.
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©2017 American Society of Civil Engineers.
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Received: Nov 18, 2016
Accepted: May 12, 2017
Published online: Aug 30, 2017
Published in print: Nov 1, 2017
Discussion open until: Jan 30, 2018
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