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INFLUENCE OF HEIGHT TO DIAMETER RATIO ON IMPINGEMENT HEAT TRANSFER ON EFFUSED CONCAVE SURFACE

DOI: 10.1615/ICHMT.2009.HeatTransfGasTurbSyst.480
16 pages

M. Ashok Kumar
Thermal Turbomachines Laboratory, Department of Mechanical Engineering, Indian Institute of Technology Madras, Chennai 600036, India

Bhamidi V. S. S. S. Prasad
Thermal Turbomachines Laboratory, Department of Mechanical Engineering, Indian Institute of Technology Madras, Chennai 600036, India

要約

The leading edge of a gas turbine nozzle guide vane is typically protected by a combined jet and effusion cooling. The compressed air jet, impinging on the interior surface of the leading edge, offers a high heat transfer coefficient. Among various factors influencing the heat transfer rate, the ratio of the spacing (H) between the target plate and the jet exit and the diameter (D) of the jet plays a major role. The present work aims at computationally analyzing the influence of height to diameter ratio (H/D = 0.5, 1, 3 and 5) on flow and heat transfer. An array of 5x4 jets impinging on the isothermal concave target surface with effusion holes (4×4) positioned in a staggered fashion with respect to the jet holes is considered for the study. The exit flow after impingement on the target surface to the ambient is provided by one of the two exit configurations for the spent air. Steady state simulations are carried out using Fluent code. The impinging flow is characterized by two stagnation zones on the target surface; the primary one is the stagnation zone along the jet center line and the secondary one in the up-wash region. Correspondingly first and second peak in Nusselt number occurs in the stagnation zones. It is observed that the average heat transfer coefficient reduces as H/D increases beyond unity for both the exit configurations.

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