分析燃气轮机动态特性的“主导因素法”

本文利用伪随机二进制信号现场辨识的结果,与理论分析相结合,提出了分析燃气轮机动态特性的一种新设想——“主导因素法”。其基本思想是:在各个不同工况下,燃气轮机中的某个参数可以作为决定其动态响应的主导因素。这个方法对建立燃气轮机的简化数学模型有很大用处。先由设计工况点出发,取得该点的动态特性,然后根据“主导因素”的变化便可大致决定其他运行点(包括稳态工况和非稳态工况)的动态特性。实验结果和用“主导因素法”的计算结果基本吻合。

DOMINANT FACTOR METHOD FOR ANALYZING DYNAMIC BEHAVIOUR OF GAS TURBINE

A new proposal-dominant factor method-for analyzing the dynamic behaviour of gas turbine is suggested by utilizing the results of field identification by pseudo random binary signal and combining with the theoretical analysis. The basic concept can be stated as follows.though the dynamic behaviour of gas turbine is different for each operating point,one of the parameters of the gas turbine can be selected as the dominant factor dictating its dynamic response. This parameter is the partial derivative of air flow rate Gc versus speed of the gas generator rotor n1, that is (dGc/dn1) in the compressor chart. Therefore, it isreadily to establish the simplified mathematical model of gas turbine as a nonlinear system. At first,we calculate the linear model for the design point, and then in accordance with the variation of this dominant factor the dynamic model for the other operating points can be approximately determined (for steady and unsteady regimes). The feasibility of this method is proved by experiment.