Fluid Mechanics & Aerodynamics

Fluid Mechanics & Aerodynamics

Numerical Study of the Effect of Rotation on the Film Cooling Effectiveness of a Turbine Blade with Square Pulsating Cooling Flow

Document Type : Original Article

Authors
mahdi hoseini baghdad abadi
saAdat zirak
mehran rajabi zargar abadi
semnan
Abstract
In this paper, the effect of the turbine blade rotation on the temperature distribution and film cooling effectiveness for a square pulsing cooling flow is numerically studied. The square pulsed cooling air flow is injected to the turbine blade at three frequencies of 2, 50, and 500 Hz. Four rotation speeds of 0, 500, 800, and 1000 rpm, clockwise and counter-clockwise, are considered. Geometry is modeled in Gambit and the numerical analysis is performed by Fluent software. SST k-ω turbulence model is used to apply the turbulence effects. The obtained results show that the rotation deviates the coolant flow from the centerline. Changing the coolant flow to square pulsating, centerline effectiveness changes with time in a cycle. The results show that in general, the effectiveness ​​at all speeds on the pressure side are greater than the suction side. Moreover, with increasing frequency, the average level of centerline effectiveness increases.
 
Keywords
Pulse Film Cooling
Square Wave
Rotating
Turbine Blade
SST k-ω Turbulence Model
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  • Receive Date 11 November 2018
  • Accept Date 13 April 2019
  • Publish Date 22 June 2019