毫米级微型涡轮发动机性能仿真模型

Performance simulation model of millimeter-scale micro turbine engine

为满足毫米级微型涡轮发动机性能设计需求,提出了一种毫米级微型涡轮发动机性能仿真模型。该模型采用考虑低雷诺数效应和传热效应的微型涡轮发动机叶轮特性,并将热平衡方程纳入该发动机性能仿真模型的共同工作方程组。通过与静子结构热网络方程组的耦合求解,实现了微型涡轮发动机特性和部件传热的动态模拟。以典型毫米级微型涡轮发动机为对象建立了仿真算例,研究了启动过程中发动机内部参数的变化规律。结果表明:毫米级微型涡轮发动机转动惯量对其加速性能影响微小,非稳态传热效应是影响其过渡态特性的主要因素。发动机转子和静子部件达到热响应时间存在显著差异,导致发动机启动过程的工作线呈现多拐点的现象。

In order to meet the requirement of milimeter-scale micro turbine engine performance design,a numerical model was presented to evaluate the performance of millimeter-scale micro gas turbine engines. In this model,new turbomachinery characteristic maps were applied,which took both low Reynolds number effects and heat transfer effects into consideration. Heat balance equations were also added into the matching equations. By coupled solving of the matching equations and the static structure thermal network equations,the engine performance and component heat transfer were dynamically simulated. Furthermore,a typical millimeter-scale micro turbine engine was modeled to study the dynamic changes of the engine internal parameters during startup. The results show that the rotational inertia has little influence on engine acceleration,while the unsteady heat transfer is the major determinant of engine transient performance. There is significant difference in thermal response time between rotor and static structures,which results in several kinks in startup operating line.