采用奇点法设计离心泵叶片
首发时间:2010-04-08
摘要:奇点法多用于离心泵叶轮中有势流动,即正问题的分析中,以反问题方式设计叶片还很少见,本文提出采用奇点法以反问题方式设计离心泵叶轮叶片。采用三阶Bezier曲线描述叶片骨线上的涡密度分布以便保证得到光滑的叶片。给出的涡密度分布可以考虑叶片冲角和叶片负荷系数分布。对某一实验叶轮的叶片进行了反问题设计,同时采用CFD程序Fluent对原叶轮和新叶轮进行了三维粘性紊流流动分析。结果表明,对于给定的合理的涡密度分布,提出的算法是收敛的。涡密度分布可以控制叶片形状和流动分布规律。在设计工况下,叶轮水力效率提高5%。
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Design Centrifugal Pump Impeller Blades with a Singularity Method
Abstract:The singularity method has been extensively applied into a analysis (direct problem) the potential flow through centrifugal pump impellers, but it is much less utilized in the inverse design (inverse problem) for such impeller blades. As a result of this, a singularity method was proposed in this paper for inversely designing impeller blades. A cubic Bezier curve was established to express mathematically bound vortex intensity density function along the blade camber so as to get a smooth and loading carefully controlled blade. The angle of attack and blade loading factor were taken into account in a given bound vortex intensity density function. A typical experimental centrifugal pump impeller blade was redesigned as an inverse problem. Furthermore, the three-dimensional turbulent viscous flows inside the original and redesigned impellers were calculated numerically by means of a CFD code Fluent. It was shown that the numerical algorithm proposed in the method is converged for a well-posed bound vortex intensity density profile. The blade shape and flow pattern on the blade can be controlled easily by altering such a profile. The CFD outcomes confirmed that the original impeller hydraulic efficiency was improved by 5% at the design duty.
Keywords: centrifugal pump singularity method impeller blade inverse problem CFD
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No.4171925714912707****
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