船用燃气轮机建模技术研究

建立燃气轮机数学模型是船舶动力及其控制系统研制的重要手段,建模的关键在于提高精度和收敛速度.为解决缺少部件实验特性数据的问题,本文基于相似理论提出了运用转速相似、流量相似和几何相似参数,对已知机组特性数据进行变换,从而获得具有相似关系的待建模机组的特性数据.考虑到两个机组的非绝对相似性,对特性数据进行修正,以提高建模精度.采用传统N-R法与有限域搜索法相结合的方法有效地提高了收敛速度.上述方法业已成功地应用于某型三轴燃气轮机的建模中.

A Study on Modeling Technology for Ship Gas Turbine Engine

The mathematic model of gas turbine engine is important for the development of ship power and its control system. The key of modeling is the precision and convergence. Sometimes it is difficult to establish the model using analysis method in the absence of component characteristics. Therefore,based on similarity theory, the component characteristics of the target gas turbine engine are obtained by transferring that of the reference gas turbine engine using speed similarity, flux similarity and geometry similarity rule. Considering the relative similarity of the two kinds of gas turbine engine, a series of methods to increase the precision of the model is proposed. Classic Newton-Raphson method with restricted search range is adopted to increase the convergence performance. All these methods have been successfully applied to a three axis gas turbine engine and the simulation results have shown the feasibility and effectiveness of the methods proposed by authors.