In modern low pressure turbines the efforts to increase aerodynamic blade loading by increasing blade pitch and optimizing midspan performance in order to reduce weight and complexity can produce increased losses in the endwall region. Airfoils of high flow turning and high pressure gradients between the blades generate strong secondary flows which impair the global aerodynamic performance of the blades. In addition, the unsteady incoming wakes take influence on transition phenomena on the blade surfaces and the inlet boundary layer, and consequently affect the development and the evolution of the secondary flows. In this paper, the T106 cascade is used to identify the effect of unsteady wakes on the development of secondary flows in a turbine cascade. Numerical and experimental results are compared at different flux coefficients and Strouhal numbers, the relative differences and similarities are analyzed.
Effects of Unsteady Wakes on the Secondary Flows in the Linear T106 Turbine Cascade
Contributed by the International Gas Turbine Institute (IGTI) of ASME for publication in the JOURNAL OF TURBOMACHINERY. Manuscript received February 28, 2014; final manuscript received March 31, 2014; published online May 2, 2014. Editor: Ronald Bunker.
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Ciorciari, R., Kirik, I., and Niehuis, R. (May 2, 2014). "Effects of Unsteady Wakes on the Secondary Flows in the Linear T106 Turbine Cascade." ASME. J. Turbomach. September 2014; 136(9): 091010. https://doi.org/10.1115/1.4027374
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