Modeling and Efficiency Prediction of Aeroengine Centrifugal Pump Integrated Loss Model Based on One-Dimensional Flow

基于一元流动的航空离心泵综合损失模型与效率预测

¹ School of Power and Energy, Northwestern Polytechnical University, Xi’an 710072, China
² Chinese Aeroengine Control Research Institute, Wuxi 214063, China

Received: 12 September 2017

Abstract

This paper was presented a method of integrated loss model by considering all kinds of loss type in centrifugal pumps. The geometric structure and loss mechanism of the flow parts in the centrifugal pump were analyzed, such as suction chamber, impeller, vaneless diffuser chamber, volute type water collecting chamber and outlet diffusion section. The hydraulic loss model, volume loss model, friction loss and mechanical loss model of centrifugal pump were established respectively by combining the flow theory. Finally, an integrated loss model of centrifugal pump was constructed, which can establish the relationship between the 12 main design parameters and pump efficiency of the centrifugal pump. Then the performance prediction of an aeroengine fuel centrifugal pump was carried out based on the loss model, and the loss model predictions were compared with the experimental data and CFD simulation performance prediction data. Simulation results show that:The efficiency predicted value relative error of centrifugal pump is less than 2.8% between the loss model and the experimental data. The computational efficiency of CFD is less than 4.4% compared with the experimental data in the design condition. The relative error is about 1.6% between the CFD method and the loss model which shows that the loss model predicts efficiency accuracy is better than the CFD method. It shows that this method can be used to predict the efficiency performance of centrifugal pump under design process.

摘要

给出了一种全面考虑离心泵内各种损失形式的综合损失模型的建立方法，通过深入分析离心泵吸入室、叶轮、无叶扩压室、蜗壳形集水室和出口扩散段在内的各通流部件几何结构及损失机理，结合一元流动理论分别建立离心泵的水力损失模型、容积损失模型、轮盘摩擦损失和机械损失模型，最终构建一个能够表征12个离心泵主要设计参数与泵效率间的综合损失模型。基于所建立的损失模型进行了某航空燃油离心泵的性能预测研究，并将损失模型预测结果与试验数据、CFD仿真数据进行了对比研究。仿真结果表明：采用损失模型的效率预测值与该型航空离心泵试验数据相对误差小于2.8%，在设计工况下，CFD仿真得到的离心泵效率与试验数据相比误差在4.4%以内，损失模型的预测效率相比较CFD预测值，准确性高于CFD方法1.6%，表明所建立损失模型预测效率精度优于CFD方法，能够用于准确的预测离心泵设计过程的工作效率。