Flowfield measurements in supersonic film cooling including the effect of shock-wave interaction

Numerical simulation of supersonic film cooling in a rearward-facing slot

“…The discrepancy at À0:17 y=S 1:4 may be due to the same reason as shown in Figure 5(a) or due to the interference of shock and expansion waves emanating from the upper tip of the lip in the experiments of Juhany and Hunt. 31 The profiles after x/S = 3 are consistent with those derived from the experiments except for some deviation at x/S = 58, y=S ' 2, which may be due to the shock and expansion waves reflected by the upper wall of the test section. In general, this work provides a good prediction of the flowfield of supersonic film cooling in the experiments of Juhany and Hunt.…”

“…Thus, a three-dimensional simulation with much more complicated turbulence model, such as the work of LES or DNS, is expected in future studies. Figure 6 presents the comparison of the numerical modeled pitot pressure profiles with those described in the experiment of Juhany and Hunt 31 at different streamwise positions after the step to validate the flowfield after the slot. At x/S = 3, the modeled profile matches the measured profile well at À1:17 y=S À0:17, indicating the accurate modeling of the slot flow in the simulation.…”

“…A precursor simulation was conducted to model the development of the boundary layer of a flat plate. After the precursor simulation, the total pressure profiles of the boundary layer in different streamwise positions were matched with that of Juhany and Hunt, 31 and the specific inflow profile of the current modeling was captured at the best matched streamwise position. The inflow profile at a certain distance before this specific position was then used in the main simulation to make the inflow state of turbulence be matched with that of the experiments.…”

“…Juhany and Hunt 31 measured many pitot pressure profiles of several streamwise locations during their experimental runs. It should be known if the current model could capture these characteristics, so the case 1 of the tests of Juhany and Hunt 31 was modeled with the current numerical method.…”

“…Juhany and Hunt 31 presented the boundary layer thickness of the mainstream in their experiments, and the boundary layer state should be modeled first. A precursor simulation was conducted to model the development of the boundary layer of a flat plate.…”