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| The special characteristic of hydraulic free piston diesel engine decides its differences in the aspects of piston displacement, velocity, and acceleration etc. These differences lead to more complex fluid flow, and particular intrinsic energy distribution in-cylinder. All these factors results in the differences of heat release. This article shows the heat release rate difference between the start cycles and the stable cycles and deems that the difference is related with the ignition delay period. From the expression equation of ignition delay period, the reason is ascribed to the boundary temperature. Based on selection of several cycles, we study the maximum value of heat release rate and pressure in-cylinder and it is obvious that the ignition delay period affects the heat release rate, pressure and BDC position. Finally, the corresponding optimum proposals for decreasing the difference are also represented. |
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| Keywords:power machinery;heat release rate; hydraulic free piston diesel engine; scavenging; heat transfer; intrinsic energy; |
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