Numerical simulation of film cooling effectiveness on a flat plate

Abstract

SUMMARYNumerical simulation has been conducted to study film cooling effectiveness on a flat plate. Threedimensional geometry was generated and the effects of blowing ratio and geometrical shape were studied. The simulation results show that cooling hole shape affects film cooling effectiveness significantly. The LDSA hole decreases the momentum of jet flow at the exit area of the hole and avoids lift-off phenomenon. Counter-rotating vortex formed downstream of the hole is weaker for the LDSA hole and secondary flow is not powerful enough to disturb the jet flow structure next to the wall. Also the results show that the LDSA hole has a better lateral coverage due to the diffused shape of the hole and has a higher effectiveness value in a wider region on the wall.

Large-Eddy Simulation of double-row compound-angle film cooling: Setup and validation

“…The papers referred to in [9,10] can be subdivided into three groups. Most simulations [10][11][12][13] deal with simple-angle film cooling (0°< a < 90°, b = 0°), while some [14,15] study the effect of the compound angle (0°< a < 90°, b -0°) and some others [16][17][18] consider cylindrical holes but non-cylindrical hole exits. Further work has focused on the interactions of multiple closely spaced holes [8,19].…”

Effect of forward expansion angle on film cooling characteristics of shaped holes

“…Bohn and Moritz [20] conducted a series of numerical simulations for a plat plate with seven rows of cylindrical and shaped holes and reported that a lower inclined angle gave higher cooling effectiveness and forward and lateral expansion angles reduced the exit radial velocity of cooling gas, which led to an improvement in film coverage. Kanani et al [21] studied film cooling effectiveness on a flat plate with cylindrical and laterally diffused holes with a streamwise angle of 30°and a spanwise angle of 0°. They found that a better lateral coverage and a higher cooling effectiveness value were obtained by laterally diffused hole since the laterally diffused structure decreased the momentum of coolant jet flow at the exit of the hole.…”

A Numerical Study On Active Film Cooling Flow Control Through The Use Of Sister Holes

“…With advancing manufacturing techniques, the ability to shape coolant holes has become a reality. The study of Kanani et al [14] focused on the impact of laterally-diffused simple angle coolant holes. Their research, which made use of the RSM turbulence model, indicated that the laterally diffused holes offer improved performance over standard cylindrical holes due to less penetration into the mainstream.…”

“…Their research, which made use of the RSM turbulence model, indicated that the laterally diffused holes offer improved performance over standard cylindrical holes due to less penetration into the mainstream. Subsequently, the diffused exit area causes the coolant to spread, improving lateral coverage [14].…”