Abstract
A general model of an irreversible fluid flow system is established, in which the linear and nonlinear fluid flow resistances and the friction forces of different types are taken into account. The influence of the piston speed and friction force on the instantaneous power output and efficiency of the system is analysed. The instantaneous power output is maximized. The characteristics of instantaneous power outputs versus efficiency are revealed. The optimum criteria of some important parameters are given. Some typical cases are discussed in detail. The results obtained here are general and can include the important conclusions of the various special cases investigated in the literature.
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