Numerical simulation of effect of momentum ratio on gas film cooling effectiveness

Section 1 of the full paper briefs the simulation procedure we have customarily employed and outlines the numerical simulation work done that is reported in this paper. Section 2 presents the simulation results, given in Figs. 3 through 6, and their analysis; they show preliminarily that: (1) with increasing momentum ratio, the secondary flow deviates from the blade surface at the outlet of the gas film hole; there is an area of high speed with decreasing momentum ratio; (2) generally, the cooling effectivenesses decreases with increasing non-dimensional distance x/d when both the turbulence intensity and the density ratio are kept constant; (3) there is an obvious difference between numerical values and experimental values at the region near the exit of the gas film hole. All in all, numerical simulation, in our opinion, can determine the nature of the characteristics of gas-film flow.