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- W2334953946 abstract "A hot streak profile was produced experimentally at the inlet to a turbine vane annular cascade through the use of two pairs of opposed cold dilution jets. Time-averaged inlet temperature measurements were obtained in the facility with vanes installed, by traversing thermocouples across the inlet plane. A 3D, steady, RANS numerical model of the entire test section, including the dilution jets, was developed, the results of which were compared to the experimental measurements obtained. Six different turbulence models were implemented to determine the sensitivity of results to choice of model. It was found that each of the models predicted varying amounts of diffusion, and thus jet temperatures, at the inlet plane. Choice of turbulence model thus has a first order effect on diffusion. In general, the turbulence models predicted very similar positions of the jets within the vane inlet, with the RNG and Reynolds Stress models showing slightly increased penetration into the cross flow. All of the turbulence models underpredicted jet mixing and lateral spreading, which is a common finding with many studies on RANS modeling of jets in cross flow. Possible additional causes to the mismatch were also discussed, with the sensitivity to freestream turbulence intensity tested by conducting additional simulations. It was concluded that in addition to the difficulties associated with modeling jets in crossflow using RANS, the turbulence models’ poor performance under high free stream turbulence is a major contributor to the mismatch with the experiment." @default.
- W2334953946 created "2016-06-24" @default.
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- W2334953946 date "2015-01-03" @default.
- W2334953946 modified "2023-09-23" @default.
- W2334953946 title "Measurement and Prediction of Hot Streak Profiles Generated by Axially Opposed Dilution Jets" @default.
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- W2334953946 doi "https://doi.org/10.2514/6.2015-0304" @default.
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