Abstract
Tip leakage has a significant effect on the aerodynamic and thermal performance of gas turbines. Losses from the leakage flow often account for as much as one third of the total loss through a turbine stage. Among the recent experimental studies, Bindon (1989) measured the flow field in the tip gap and the subsequent mixing region in a linear cascade of turbine blades. He suggested that the tip leakage loss consists of two components, i.e., the internal gap loss and the mixing loss. In addition, he demonstrated that the fluid of low total pressure contributes significantly to the mixing loss after the flow leaves the gap. Based on the above-mentioned experimental observation and the three-dimensional N-S calculation of Storer and Cumpsty (1994), the present study is aimed at improving a tip leakage loss model that is consistent with the physics of the real leakage flows.
Published Version
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