The thermodynamic properties on flow passage of a class F uniaxial heavy-duty gas turbine is studied.On the basis of modularize modeling for major component in MATLAB/Simulink,a simulation model of gas turbine system is built,which is helpful for the simulation study of the characteristic calculation of the rotor axis of compressed air and high temperature gas on the typical section.A simulation model of compressor is established,combined with the feature-level algorithm which characterizes the compressor stage characteristics,and the simulation modeling method of compressors which dividing the compressor stage according to the extraction point.In order to ensure the simulation accuracy,because of the massive temperature change in the flow passage and the problem of mixed flow due to the combustion reactions,variable specific heat capacity formula is adopted in this model to calculate the thermal parameters of air and gas.In addition,the detailed calculation of mass fraction components of working medium is conducted,and volume inertia and the influence of the rotational inertia of the whole system model is considered.The results show that the simulation model can meet the accuracy requirement of the modeling in the practical application.%以某F级单轴重型燃气轮机通流部分热力特性为研究对象,通过模块化建模方法在MATLAB/Simulink平台中建立燃机系统仿真模型,对燃气轮机典型截面上压缩空气和高温燃气沿转子轴向的特性进行仿真研究.提出了一种结合表征压气机级特性的基元级算法和根据抽气点位置划分的压缩级建模方法的压气机仿真模型.由于燃机通流部分工质的温度变化较大,而且伴随着燃烧反应及燃气与冷却空气混流问题,为保证仿真精度,该模型采用变比热容公式计算空气和燃气的热力参数,并对工质组分质量分数进行详细计算,还考虑了容积惯性和转动惯性对整个系统模型的影响.结果表明,该仿真模型在实际应用中能够满足建模精度的要求.
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