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Performance analysis of a four-stroke compressed air engine

The purpose of this paper is to investigate working performance for a four-stroke compressed air engine (CAE) via numerical studies. A mathematical model is developed to study the influence of several operative parameters on working performance. The mathematical model consists of thermodynamic model, each stroke model and dynamic model. In addition, a working principle and an experimental system of the CAE are set up. The aims are to (1) introduce the novel four-stroke engine, and (2) quantify the influence of rotational speed, supply pressure and supply temperature on working characteristics. The simulation and analysis show several meaningful results. The CAE has higher cylinder pressure and work efficiency in lower speed stage, and the increase of the supply pressure can effectively improve indicated work and work efficiency. However, supply temperature has little effect on the performance of the CAE. Therefore, the study of this work will provide a certain guidance function for further study on optimizing design of the CAE.
PAPER REVISED: 2019-02-09
PAPER ACCEPTED: 2019-02-17
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