Dual-rotor piston engine (DRPE)is a new type of differential rotary engine,with the pistons moving in a circle rather than linearly. Compared with the conventional engines,the complex valve systems can be omitted,and its power density is higher.In order to study the major performance indicators of DRPE,Matlab/simulink was used to simulate the zero-dimension model of its thermodynamic process.With regard to the characteristics of DRPE’s working process,the differential equations were established.Taking into account various period features,the equations were simplified.The ways to solve the major boundary conditions were found.Values of the mass,pressure and temperate were calculated according to different shaft angles.Then DRPE ’s indicated mean effective pressure and power to weight ratio were calculated.Compared with some conventional internal combustion engines,the volume of DRPE’s chamber is used more efficiently,and its integral structure is more compact.%双转子活塞发动机是一种新型的差速式转子发动机，与传统发动机相比较具有很多优点，如不需要复杂的阀门装置，而且功率密度更高等。为了分析和研究双转子活塞发动机的运行特性，针对该发动机工作循环的热力学过程建立了其零维模型，确定了主要的边界条件，运用Matlab/simulink进行了数值模拟。对应不同的主轴转角，计算出气缸内工质的质量值、压力值和温度值。基于算得的压力值，求取了该发动机的平均指示压力和功重比等参数，与传统发动机相比较，双转子活塞发动机气缸工作容积的利用程度更大，整体结构更加紧凑。
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