engleski

Effect of Combined Hole on Particle Deposition in a Turbine Cascade

Numerical simulations are conducted to investigate an effect of combined hole configurations on particle deposition in an AGTB turbine cascade. The realizable k-ε turbulence model with the discrete phase model (DPM) is used and developed based on user- defined functions. This paper investigates many factors on the particle deposition, such as particle size, blowing ratio and mainstream inlet angle. In order to understand the effect of the hole configuration on the particle deposition, a comparison of results between the combined and the cylindrical holes is conducted by calculations of capture and impact efficiencies. Results show that larger particle size causes more impact on the blade surface, and the impact area on the blade pressure side expands with the increase in the mainstream inlet angle from 123° to 143°. For 10 μm particles (diameter), an increase of the blowing ratio reduces the capture efficiency. It is also found that the particle capture efficiency for the combined hole is lower than that for the cylindrical hole, when the mainstream inlet angle is 123°.

Gas turbine ; particle deposition ; combined hole ; blowing ratio ; inlet angle

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