Experiment for particle deposition in turbine blade cooling channel
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摘要:
进入涡轮叶片内部的微尘颗粒易沉积并削弱内冷通道的换热。为了探究叶片内冷通道中微尘颗粒的沉积特性，实验研究了微尘颗粒直径和冷气雷诺数对颗粒沉积的影响。实验结果表明：内冷通道的沉积率随冷气雷诺数先增大后减小，当雷诺数为
23810 时沉积率达到峰值，但冷气雷诺数继续增大时，沉积率出现了明显下降趋势；当微尘颗粒直径增大时，叶片通道中的沉积率相应增大；叶片前腔处的沉积率要大于中弦腔及后腔处的沉积率，尾缘处的收集率要大于后腔出口及除尘孔处的收集率；在叶片通道中，扰流肋背风面处的颗粒沉积量大于迎风面处的颗粒沉积量，前腔拐角处的颗粒沉积量大于中弦腔拐角处的颗粒沉积量。Abstract:The fine dust particles entering turbine blades are easy to deposit and weaken the heat transfer performance of the internal cooling channels. In order to explore the deposition characteristics of fine dust particles in the cooling channel inside the blade, the effects of fine dust particle diameter and Reynolds number of cooling air on the deposition of fine dust particles were experimentally studied. The experimental results showed that the deposition rate of the internal cooling channel increased firstly and then decreased with the Reynolds number of the cooling air. When the Reynolds number was up to
23810 , the deposition rate reached the peak. However, when the Reynolds number of the cooling air continued to increase, the deposition rate showed an obvious downward trend. When the diameter of fine dust particle increased, the deposition rate in the blade channel increased. The deposition rate at the front cavity of the blade was higher than that at the middle chord cavity and the back cavity, and the collection rate at the trailing edge was higher than that at the exit of the back cavity and the dust removal hole. In the blade channel, the amount of particles deposited on the leeward side of the ribs was greater than that on the windward side, and the amount of particles deposited at the corner of the front cavity was greater than that at the corner of the middle chord cavity.-
Key words:
- particle deposition /
- deposition rate /
- collection rate /
- turbine blade /
- internal cooling channel
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图 3 叶片内流通道中3个出口示意图
Figure 3. Schematic diagram of three exits in the flow passage in the blade
图 4 冷气雷诺数为
27211 下微尘沉积形貌（dp=24 μm）Figure 4. Appearance of fine dust deposition under the condition that the Reynolds number of cold air is
27211 （dp=24 μm）
图 5 不同冷气雷诺数下压力面整体沉积形貌（dp=24 μm）
Figure 5. Overall deposition morphology of pressure surface under different cold air Reynolds number （dp=24 μm）
图 6 不同微尘直径下吸力面整体沉积形貌（Re=
27211 ）Figure 6. Overall sediment morphology of suction surface under different dust diameters （Re=
27211 ）
图 7 不同微尘直径在不同冷气雷诺数下的沉积率
Figure 7. Deposition rate of different dust diameters under different cold air Reynolds numbers
图 8 不同微尘直径下前腔、中弦腔及后腔沉积率
Figure 8. Deposition rates of front, middle and back cavities under different dust diameters
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