摘要
在燃气轮机等热机系统的仿真中,气体属性环节的处理及其快速准确计算是一个普遍遇到的问题。本文根据容积法系统建模的思想,建立了一种通用介质容积模型。这种介质容积模型实际上是一个能量和质量的存储器,其内部视为均匀场,即处处具有相同的热力状态,通过流入流出的流量差而引起其间参数变化。它由状态转变模块和介质模块两部分组成,包涵了质量和能量守恒关系,能够准确地反映瞬态过程中各主要参数的变化,满足进行实时仿真对模型的要求,同时具有通用性。使用容积法建立的热机模型,可以避免流量和压强关系的迭代计算,同时对计算量的要求又在合理的范围内。在仿真软件Modelica的支持下,利用这种通用介质容积模块建立了燃气轮机模型,并进行动态仿真。
In the system-level simulation of the power machinery,such as the gas turbines and the inter combustion engines,the accurate and fast calculation of the gas volume model is one of the key problems.In this paper, a new general gas control volume modeling method was developed and the main processes were introduced.In the general gas control volume model,the storage of mass and energy are modeled in the control volume and one variable has only its value.Inside the control volume,the mass and energy are set and the other thermo parameters are calculated.There are two parts contained in the volume model,the sate variable transformation model and medium model.The control volume model contains the energy and mass balances,reflects the variance of main parameters in a transient process,meets the requirements of real-time simulation,and can e used in modeling of the various thermo power machineries.The developed gas volume modeling method not only avoids the iteration calculation,but also has the reasonable computation capacity.Based on the new simulation software the Modelica,the developed gas control volume model has been employed in the real-time system-level simulation of the gas turbine.
出处
《燃气轮机技术》
北大核心
2003年第4期34-38,共5页
Gas Turbine Technology
基金
教育部青年教师教学科研奖励计划
美国UTRC公司资助。
