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The near casing flow fields inside the rotor passage of a 1.5 stage axial compressor with different blade-loading levels and tip gap sizes were measured by using stereoscopic particle image velocimetry (SPIV). Based on a carefully defined blockage extracting method, the variations of blockage parameter inside the blade passage were analyzed. It was found that the variation of blockage parameter appeared as a non-monotonic behavior inside the blade passage in most cases. This non-monotonic behavior became much more remarkable as the blade loading increases or mass flow rate decreases.The variations of the blockage parameter inside the blade passage had close relation to the evolutionary procedures of the tip leakage vortex (TLV). The destabilization of the TLV caused a rapid increasing of the blockage parameter. After the TLV lost the features of a concentrated streamwise vortex, the blockage parameter usually got a peak value. And then, because of the intense turbulent mixing between the TLV low momentum flow and its surrounding flows, the flow deficit inside the TLV recovered.  相似文献
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摘要: 基于COBRA-IV开发出了适用于铅铋合金冷却组件和堆芯的子通道热工水力分析程序SUBAS,并利用其对铅铋合金冷却组件进行了详细的子通道分析,主要分析了不同燃料棒数目对组件内的温度场和速度场的影响;对湍流交混模型、横流压降系数、换热系数模型等做了相关的参数敏感性分析。研究结果表明:燃料棒数目的增加会导致组件内外质量、动量和能量的交换更加困难,各类通道的温度都有所升高;定位格架不仅增加了组件压降,而且降低了相邻通道之间的横向流动;湍流交混模型对组件的温度场和速度场影响较大,需要重点研究。  相似文献
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