One and a half stages of a low pressure turbine were investigated using a three-dimensional time-accurate viscous solver. Unsteady analyses were carried out by varying the circumferential relative position of consecutive vanes to study the effects of clocking on performance. Assuming that efficiency improvements by clocking are linked to the wake tangential position with respect to the successive blade, a certain circumferential shift in this position can be observed along the blade height due to blade twist and nonradial stacking, giving different contributions. In order to assess this phenomenon, results from three-dimensional computations were compared with a quasi-three-dimensional analysis at mid-span. The effects of clocking on wake interaction mechanisms and unsteady blade loadings are presented and discussed.
Numerical Investigation of Three-Dimensional Clocking Effects in a Low Pressure Turbine
Contributed by the International Gas Turbine Institute and presented at the International Gas Turbine and Aeroengine Congress and Exhibition, Atlanta, GA, June 16–19, 2003. Manuscript received by the IGTI Dec. 2002; final revision Mar. 2003. Paper No. 2003-GT-38414. Review Chair: H. R. Simmons.
Arnone , A., Marconcini, M., Del Greco, A. S., and Spano, E. (September 3, 2004). "Numerical Investigation of Three-Dimensional Clocking Effects in a Low Pressure Turbine ." ASME. J. Turbomach. July 2004; 126(3): 375–384. https://doi.org/10.1115/1.1740780
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