Computational flow and heat transfer of a row of circular jets impinging on a concave surface |
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Authors: | B V N Rama Kumar B V S S S Prasad |
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Institution: | (1) Thermal Turbomachines Lab, Indian Institute of Technology Madras, Chennai, 600 036, India |
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Abstract: | A computational investigation is carried out to study the flow and heat transfer from a row of circular jets impinging on
a concave surface. The computational domain simulates the impingement cooling zone of a gas turbine nozzle guide vane. The
parameters, which are varied in the study include jet Reynolds number (Re
d = 5000–67800), inter-jet distance to jet diameter ratio (c/d = 3.33 and 4.67) and target plate distance to jet diameter ratio (H/d = 1, 3 and 4). The flow field, predicted with K-ω turbulence model and using Fluent 6.2.16, is characterized with the presence of a pair of counter rotating vortices, an upwash
fountain flow and entrainment. The local pressure coefficient and Nusselt number variations along the concave plate are presented
and these values are found to under predict the available experimental data by about 12%. |
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Keywords: | |
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