双轴燃气轮机动态仿真模型研究

Dynamic simulation model for biaxial gas turbines

为了提高燃气轮机仿真的精度,采用变比热容的计算方法,并考虑了油气比和排压的变化,基于Matlab/Simulink软件建立了一种非线性的考虑容积惯性的双轴燃气轮机动态仿真模型.该模型中各个模块分别对应于具体的机器部件,物理意义明确,且单个模块的独立性比较好,具有较强的扩展性.仿真结果和试验数据比较表明:此仿真模型能够将运算偏差控制在3%以内,较精确地反映系统的动态特性,且与以往的仿真模型运算结果相比较,相对准确度可提高55%以上.

In order to improve the accuracy of the simulation, one nonlinear dynamic simulative model for biaxial gas turbine is proposed by using calculation method of variable specific heat, in which the variation of gas-oil ratio and discharge pressure were considered, based on Matlab/Simulink. Each component of this model corresponded to the real machine part with definite physical significance and individual module has better independence to possess good expansibility. The operation result shows that this simulation model can make the bias within 3 %, meaning that this simulation model was more accurate to reflect the system＇s dynamic characteristics. Compared with other normal simulation models, its relative accuracy could be improved by 55 %.