Computational Investigation of Film Cooling from Trenched Holes Near the Leading Edge of a Turbine Blade

Authors:
Publisher website
Google Scholar
Abstract
Computational results are presented for a row of coolant injection holes on each side of a symmetrical turbine blade model near the leading edge. Four film cooling configurations, ( 1 V. K. Garg , Heat Transfer on a Film-Cooled Rotating Blade, NASA Rep. NASA/CR-1999–209301, NASA Glenn Research Center , Cleveland , OH , 1999 . [Google Scholar] ) a cylindrical film hole, ( 2 A. Azzi , M. Abidat , B. A. Jubran , and G. S. Theodoridis , Film Cooling Predictions of Simple and Compound Angle Injection from One and Two Staggered Rows , Numer. Heat Transfer A , vol. 40 , pp. 273 – 294 , 2001 . [Taylor & Francis Online], [Web of Science ®] [Google Scholar] ) a forward diffused film hole, ( 3 S. Sarkar and T. K. Bose , Comparison of Different Turbulence Models for Prediction of Slot-Film Cooling: Flow and Temperature Field , Numer. Heat Transfer B , vol. 28 , pp. 217 – 238 , 1995 . [Taylor & Francis Online], [Web of Science ®] [Google Scholar] ) a cylindrical film hole within a transverse slot, and ( 4 M. W. Cruse , U. M. Yuki , and D. Bogard , Investigation of Various Parametric Influences on Leading Edge Film Cooling , in Int. Gas Turbine & Aero Engine Congress & Exhibition , Orlando , FL , 1997 , ASME Paper 97-GT-296 . [Google Scholar] ) a forward-diffused film hole within a transverse slot, are used. Also, the effect of slot width is investigated. All simulations are at a fixed density ratio of 1.0, a blowing ratio of 0.5, and a pitch-to-diameter ratio of 5.0. Computational solutions of the steady, Reynolds-averaged Navier-Stokes equations are obtained using a finite-volume method. It is found that the shape of the hole and the integration of the holes with a continuous slot can significantly affect the film cooling flow over the protected surface. Also, it is found that when the slot width is almost equal to the elliptic footprint major axis, where the film hole exit is located, the shaped hole within the slot has the highest cooling effectiveness, but in other slot widths the advantage of this kind of hole configuration disappears.

This publication has 13 references indexed in Scilit: