A novel Brayton open-cycle engine is under development. It operates similar to a gas turbine engine, but uses reciprocating piston compressor and expander components. The design appears to have a number of advantages, including multifuel capability, the potential for lower cost, and the ability to be scaled to small sizes without significant loss in efficiency. An interactive microcomputer model has been developed that analyzes the thermodynamic performance of the engine. While the development of the model and its assumptions are outlined in this paper, the emphasis is on model applications. The model has demonstrated itself to be a powerful tool for evaluating engine thermal efficiency, net specific work, and power. It can be used to analyze the performance of individual engine designs, to generate performance 'maps' that graphically represent engine operating characteristics, and to perform sensitivity analysis to compare the relative effects of various input parameters.

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Journal Journal of Engineering for Gas Turbines and Power
Tsongas, G.A., & White, A. (1989). Parametric analysis microcomputer model for evaluating the thermodynamic performance of a reciprocating Brayton cycle engine. Journal of Engineering for Gas Turbines and Power, 111(4), 587–594.