离心压缩机两区域模型改进与验证

离心压缩机一维预设计中，准确的性能预测可以有效地缩短设计周期，提高设计效率。为了提高性能预测的准确性，在传统两区域模型的基础上，引入外界能量输入与叶轮旋转效应，提出一种叶轮扩压度计算模型，并结合无叶扩压器的特点，将两区域模型应用于无叶扩压器性能预测中。通过与文献中已有的实验结果进行对比，验证了改进模型的可用性。对比结果表明:改进的两区域模型有效减少对工程经验的依赖性，可以实现不同压比、不同后弯角离心压缩机性能预测，总体预测精度较高，与实验数据偏差在4%以内。 

Modification and validation of two zone model in centrifugal compressor

In one dimensional preliminary design of centrifugal compressor, high accuracy performance prediction could shorten the design cycle and improve the design efficiency. In order to improve the accuracy of performance prediction, a model of diffusion ratio based on the conventional two zone model was proposed with consideration of the effects of import external energy and impeller rotation. The two zone model was used in prediction of vaneless diffuser performance prediction by taking account of characteristics of vaneless diffuser. Validation of the model was performed against compressor maps and geometries available in the literature. The results showed that it could effectively reduce dependence on engineering experience by using the proposed model, and could be suitable for predicting performance of centrifugal compressor with different pressure ratios and back sweep angles. Predicted performance by the proposed model agreed fairly well with experiment and the percent difference was within 4%.