국내 최대 기계 및 로봇 연구정보

기술보고서

기술보고서 게시판 내용
타이틀	Heat Transfer on a Film-Cooled Blade - Effect of Hole Physics
저자	Vijay K. Garg and David L. Rigby
Keyword	Film cooling
URL	http://gltrs.grc.nasa.gov/reports/1998/CR-1998-206609.pdf
보고서번호	NASA CR-1998-206609
발행년도	1998
출처	NASA Glenn Research Center
ABSTRACT	A multi-block, three-dimensional Navier-Stokes code has been used to study the within-hole and near-hole physics in relation to heat transfer on a film-cooled blade. The flow domain consists of the coolant flow through the plenum and hole-pipes for the three staggered rows of shower-head holes on the VK1 rotor, and the main flow over the blade. A multi-block grid is generated that is nearly orthogonal to the various surfaces. It may be noted that for the VK1 rotor the shower-head holes are inclined at 30?to the spanwise direction, and are normal to the streamwise direction on the blade. Wilcoxchr(39)s k-w turbulence model is used. The present study provides a much better comparison for the heat transfer coefficient at the blade mid-span with the experimental data than an earlier analysis wherein coolant velocity and temperature distributions were specified at the hole exits rather than extending the computational domain into the hole-pipe and plenum. Details of the distributions of coolant velocity, temperature, k and w at the hole exits are also presented.