自由活塞斯特林发动机相位特性

The phase characteristics of free piston Stirling engine

为了研究自由活塞斯特林发动机的振动位移相位特性,建立了耦合发动机热力学和动力学的计算模型.在模型中对压力波进行了线性化处理,得到了自由活塞斯特林发动机两个活塞振动位移之间相位的计算公式.分析了主要参数对发动机相位角的影响规律,发现:自由活塞斯特林发动机必须在一定的充气压力范围内才满足发动机启动的配气活塞位移领先动力活塞位移的相位关系;负载电阻的变化会使电磁阻尼系数发生改变,进而影响相位关系;动力活塞板簧刚度对相位角影响较小,而配气活塞板簧刚度对相位角影响较大.

In order to study the vibration displacement phase characteristics of free piston Stirling engine,a coupled thermodynamic and dynamic calculation model of the engine was established.The pressure wave is linearized in the model,and the formula for calculating the phase between the vibration displacements of the two pistons of a free piston Stirling engine is obtained.The influence of main parameters on engine phase angle is analyzed.It is found that the free piston Stirling engine must satisfy the phase relation of valve piston displacement leading power piston displacement when the engine can start in a certain range of inflating pressure.The change of load resistance will change the electromagnetic damping coefficient,and then affect the phase relationship.The stiffness of the power piston leaf spring has little effect on the phase angle,while the stiffness of the valve piston leaf spring has greater effect on the phase angle.