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• W2000744342 endingPage "1967" @default.
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• W2000744342 abstract "The subsonic flow through highly loaded low-pressure turbines is simulated numerically using a high-order method. The configuration approximates cascade experiments that were conducted to investigate a reduction in turbine stage blade count, which can decrease both weight and mechanical complexity. At a nominal Reynolds number of 25 × 10 3 based upon axial chord and inlet conditions, massive separation occurs on the suction surface of each blade as a result of uncovered turning. Pulsed injection vortex generator jets were then used to help mitigate separation, thereby reducing wake losses. Computations were performed for both uncontrolled and controlled cases and reproduced the transitional flow occurring in the aft-blade and near-wake regions. The numerical method utilizes a centered compact finite difference scheme to represent spatial derivatives, which is used in conjunction with a low-pass Pade-type nondispersive filter operator to maintain stability. An implicit approximately factored time-marching algorithm is employed, and Newton-like subiterations are applied to achieve second-order temporal accuracy. Calculations were carried out on a massively parallel computing platform, using domain decomposition to distribute subzones on individual processors. A high-order overset grid approach preserved spatial accuracy in locally refined embedded regions. Features of the flowfields are elucidated, and simulations are compared with each other and with available experimental data. Relative to the uncontrolled case, it was found that pulsed injection maintained attached flow over an additional 15% of the blade chord, resulting in a 22% decrease of the wake total pressure loss coefficient." @default.
• W2000744342 created "2016-06-24" @default.
• W2000744342 creator A5004341878 @default.
• W2000744342 creator A5019102512 @default.
• W2000744342 date "2005-09-01" @default.
• W2000744342 modified "2023-09-27" @default.
• W2000744342 title "Numerical Simulation of Separation Control for Transitional Highly Loaded Low-Pressure Turbines" @default.
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• W2000744342 doi "https://doi.org/10.2514/1.12376" @default.
• W2000744342 hasPublicationYear "2005" @default.
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