加装短叶片离心叶轮的参数优化及实验研究

Parameter Optimization and Experimental Study of a Centrifugal Impeller with Additionally Installed Splitter Blades

利用NUMECA软件对G4-73No.8D型离心风机进行了叶轮内部流场的三维数值模拟和流动分析,发现在叶轮出口处存在着明显的射流-尾流结构。为削弱这一结构对风机性能的不良影响,对风机叶轮进行了加装短叶片的数值模拟,依据叶轮流场的改善情况,确定了短叶片的优化参数,并在此基础上,进行了风机性能的对比性实验。结果表明,改进后的风机全压明显提升,其额定工况下的效率有所提高,高效区有小幅加宽。

Through a three-dimensional numerical simulation and flow analysis of the impeller inner flow fields of a Model G4-73No.8D centrifugal fan by using software NUMECA,it has been found that there exists a conspicuous jet flow-wake flow configuration at the outlet of the impeller.To mitigate the adverse effect of the above configuration on fan performance,a numerical simulation has been performed of the fan impeller with additionally installed splitter blades.The optimized parameters of the splitter blades have been determined,depending on the flow field improvement inside the impeller.On this basis,a contrast test of the fan performance has been conducted.The results show that the total pressure of the retrofitted fan rises conspicuously with the efficiency at a rated load operating condition being somewhat enhanced and the high-efficiency zone widened by a small margin.