Effect of Rib Ratios on Turbulent Intensity of a Ribbed-Wall Channel  
Author K.K. Yuen


Co-Author(s) Eric T.T. Wong


Abstract This paper describes the application of Computation Fluid Dynamics (CFD) simulation to turbulent intensity calculation of a high pressure turbine blade operating at a take-off inlet temperature. The rib aspect ratio (AR), rib pitch to height ratio (Pi/H) and rib to duct height ratio (H/2B) were chosen as design variables of internal cooling channel of HPT blade. The ranges of AR, Pi/H and H/2B examined were 2 to 10, 5 to 15 and 0.13 to 0.21 respectively. In this study a rectangular duct of width-to-height ratio of 4:1 with one ribbed wall was assumed, a total of 45 combinations of selected Pi/H and H/2B was investigated, it was found that one of the ARs can provide the best thermal performance. Also, the optimized rib pitch to height ratio and rib to duct height ratio obtained from the simulations were 10 and 0.2 respectively. However, the result is slightly difference from the result reported by other workers [3] and the inconsistency of the results was explained.


Keywords CFD, rib aspect ratio, rib pitch to height ratio, rib to duct height ratio
    Article #:  21184
Proceedings of the 21st ISSAT International Conference on Reliability and Quality in Design
August 6-8, 2015 - Philadelphia, Pennsylvia, U.S.A.