Standard Configuration 11

Standard Configuration 11 [15] is a two-dimensional turbine cascade. An off-design transonic condition is examined which is characterized by a sep­arated flow region on the suction side with detachment immediately down­stream of the leading edge and re-attachment at approximately 30 percent chord. A shock is also present on the suction surface at approximately 80 percent chord. The infbw conditions are: в і = — 34.0o and inlet Reynolds number is 1.4 x 106. The isentropic Mach number at the exit M2 = 0.99. The imaginary unsteady pressure response due to harmonic bending normal to chord with ш* = 0.309 and a = 180o is shown in Fig. 5. Solutions are shown at two mesh resolutions (17518 and 70072 cells) with the height of the first grid line above the profile equal to h/c = 2.0 x 10-5 (y+ = 1.15) and h/c = 1.0 x 10-5 (y+ = 0.58) respectively. AUSMDV was used to calculate the flixes because the dissipative behavior of EFM in a boundary layer makes it unsuitable for viscous fbws [7]. AUSMDV is preferred to Roe’s scheme because it is less susceptible to noise near shocks at high grid resolutions (see Fig. 4). The agreement between the current solution and the previous numer­ical work [3] is good. Note that grid convergence was not achieved where the ft)w separated and at the shock. Experimental data [15] is also shown and the disparity on the suction surface is probably due to the failure of the two­dimensional flow model to model accurately the three-dimensional separated fbw.