压气机低转速特性外推法改进研究

Research on Improvement of Extrapolating Low Speed Characteristics of Compressor

针对燃气轮机压气机低转速特性获取难的问题,总结了目前压气机低转速特性获取方法的现状,重点讨论了基于相似原理的压气机特性外推方法存在的不足。根据相似原理应用条件及压气机低转速工况特点,提出了基于相似原理的外推特性指数改进法,并通过遗传算法获取最优指数,拟合低转速特性。论文采用该方法探索研究某两型压气机的低转速特性,研究表明:该方法具有一定的通用性,为我国开展压气机低转速特性研究提供一定思路。

In view of the difficulty in getting low speed characteristics of the compressor, summarizations of acquisition method of low speed characteristics at present and discussions of disadvantages of exist extrapolating methods were brought out. On the basis of the application condition of similarity theory and low speed characteristics, a method of extrapolating method based on improved exponent of similarity theory was present. Genetic algorithm was used to obtain the optimal index. Uhimately, low speed characteristics curve of the compressor was fitted out. According to two examples for compressors of different types of engines, the method is characterized by uni- versality, providing ideas of researching low speed characteristics of the compressor in China.