熵产控制体方法对压气机近零间隙流动损失的演变规律

发布时间：2018-01-12 00:00

本文关键词：熵产控制体方法对压气机近零间隙流动损失的演变规律　出处：《航空动力学报》2016年03期 　论文类型：期刊论文

【摘要】：以澄清近零间隙流动结构及流动损失随间隙的变化规律为目标,提出熵产控制体分析方法,可精确量化流场任意位置的局部不可逆损失.数值模拟发现,间隙在0.4%叶高范围内(称近零间隙)效率水平最高且出现一对应峰值效率最高的最佳非零间隙.熵产控制体分析表明:通道内总熵产随间隙变化规律与效率一致;间隙变化对动叶端区20%~80%弦长范围内的熵产改变最为明显,主导了总熵产的变化;间隙变化时熵产改变的流动区域不同,这是由于动叶端区主导损失的流动结构发生改变造成的.进一步结合流场结构,探讨近零间隙流动损失演变的可能原因:间隙为零时壁面剪切力是造成损失的主导因素;最佳间隙时流动均匀,损失最小.
[Abstract]:In order to clarify the structure of near-zero gap flow and the variation of flow loss with the gap, an entropy production control volume analysis method is proposed, which can accurately quantify the local irreversible loss at any position of the flow field. Clearance is in the range of 0.4% blade height (called near zero clearance). The optimal nonzero gap with the highest efficiency level and the highest corresponding peak efficiency appears. The analysis of entropy production control volume shows that the variation of total entropy production with the gap in the channel is consistent with the efficiency. The change of clearance is the most obvious change of entropy production in the range of 80% chord length in the tip area of moving blade, which dominates the change of total entropy production. When the gap changes, the flow region of entropy change is different, which is caused by the change of the flow structure of the leading loss at the end of the moving blade, and the flow field structure is further combined. The possible reasons for the evolution of near-zero gap flow loss are discussed: the wall shear force of 00:00 gap is the main factor causing the loss; The flow is uniform and the loss is minimum when the gap is optimal.
【作者单位】：中国科学院工程热物理研究所先进能源动力重点实验室;中国科学院大学;
【基金】：国家自然科学基金(51176188)
【分类号】：TH45
【正文快照】： 2.中国科学院大学,北京100190)叶顶间隙(下文简称间隙)对轴流压气机的稳定性和效率的影响至关重要[1],研究已知,动叶端区的流动损失占到总流动损失的1/3以上[2].Copenhaver等[3]的研究表明,压气机效率随着间隙的增大而减小,压气机的间隙越小越好.也有研究表明,效率随着间隙的

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