Unsteady simulation of flow and heat transfer in a transonic turbine stage under non-uniform inlet conditions

Heat transfer characteristics of a high-pressure turbine under combined distorted hot-streak and residual swirl: an unsteady computational study

“…The position of each investigated hot-streak is fixed in front of the vane LE, and the clocking effect is not treated in the present work. In our recent work on the present turbine configuration [15] , it was shown that that the hot-streak aligned with the vane LE produces higher thermal load on the vane and lower thermal load on the rotor blades. When the hot-streak is aligned with the vane passage it generates higher thermal load on the rotors.…”

“…At the LE, the temperature decreased by 16 K and at the PS, it was decreased only by 7 K. However, endwall temperature increased by more than 20 K, which represents 2.8% of the averaged inlet temperature. Very recently Mansouri [15] performed an unsteady computational investigation on a HPT stage to examine the interaction between three different hot-streak maps and secondary structures from the rotor blades. Two simplified hot-streaks (radial and circular) from the literature and one distorted hot-streak at aero-engine representative conditions were evaluated.…”

“…The isolated effects of the residual swirl only, or the hot-streak only on the aerothermal performance of high-pressure turbines (HPT), are well studied in the literature, on either non-rotating vanes or rotating turbine stages [6][7][8][9][10][11][12][13][14][15][16][17] . Key experimental and computational fluid dynamics (CFD) findings from such isolated effects studies are summarised below.…”

Effect of Mainstream Velocity on the Heat Transfer Coefficient of Gas Turbine Blade Tips

“…The heated air was supplied to the cascade after passing the inlet duct with a bell-mouth and a turbulence grid (Figure 3a). The cascade consisted of six blades with a GE-E 3 high pressure turbine (HPT) blade profile [16]. Equation ( 1) was used to calculate the mainstream velocity.…”

“…By using the recently advanced computational fluid dynamics (CFD) technique, numerical studies on heat transfer of turbine components are being widely conducted [16,17]. Experimental approaches are still required to verify the CFD results, but many of them are still being performed under low-speed conditions due to the limitations in measurement devices and test facilities.…”