Proceedings of GT2007 ASME Turbo Expo 2007: Power for Land, Sea and Air May 14-17, 2007, Montreal, Canada

GT2007-27421 COMPUTATIONAL INVESTIGATIONS IN THE TRAILING EDGE REGION OF COOLED TURBINE VANE – COMPARISON OF DIFFERENT CHANNEL SHAPES N. Kulasekharan [email protected] Research scholar

B.V.S.S.S. Prasad [email protected] Professor

Thermal Turbomachines Lab, Department of Mechanical Engineering, Indian Institute of Technology Madras, Chennai, India - 600036

ABSTRACT Thermal hydraulic characteristics of coolant flow through passages consisting of rib turbulators, pin fin array and trailing edge slot are reported. Channels of straight, trapezoidal and curved shapes are considered. Continuity, momentum and energy equations for a three dimensional incompressible flows are solved. A constant heat flux value is specified over the coolant channel walls, rib surfaces and circumferential faces of the pin-fins. Total pressure loss coefficient, pin end-wall and pin surface averaged Nusselt number are estimated and presented for the pin array, for Reynolds number ranging from 20,000 to 40,000. Cambered channels showed highest pin end wall averaged heat transfer than trapezoidal channel, which is higher than the straight channel.