Individual nozzle guide vanes (NGV’s) in modern aeroengines are often cast as a single piece with integral hub and casing endwalls. When in operation, there is a leakage flow through the chord-wise interplatform gaps. An investigation into the effect of this leakage flow on turbine performance is presented. Efficiency measurements and NGV exit area traverse data from a low-speed research turbine are reported. Tests show that this leakage flow can have a significant impact on turbine performance, but that below a threshold leakage fraction this penalty does not rise with increasing leakage flow rate. The effect of various seal clearances are also investigated. Results from steady-state simulations using a three-dimensional multiblock Reynolds-averaged Navier-Stokes solver are presented with particular emphasis paid to the physics of the mainstream/leakage interaction and the loss generation.
The Interaction of Turbine Inter-Platform Leakage Flow With the Mainstream Flow
Reid, K., Denton, J., Pullan, G., Curtis, E., and Longley, J. (February 1, 2005). "The Interaction of Turbine Inter-Platform Leakage Flow With the Mainstream Flow." ASME. J. Turbomach. April 2007; 129(2): 303–310. https://doi.org/10.1115/1.2162592
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