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Research on the engine combustion characteristics of a free-piston diesel engine linear generator

机译：无活塞柴油机直线发电机的发动机燃烧特性研究

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摘要

The free-piston diesel engine linear generator (FPDLG) shows a great deal of merits due to its unique structure and operation characteristics. For this reason, most researchers mainly investigated on the FPDLG characteristics. However, there has not been any report on the engine operation characteristics. So this paper focuses on the engine operation characteristics of the FPDLG during the generating process. According to the experimental results, it is found that the output power of the designed prototype can reach 5.16 kW with the thermal efficiency of up to 38.5%. Experimental test results are obtained and processed both in time and crank-angle coordinates. Compared to the conventional diesel engines, the ignition delay of the FPDLG is shorter and the premix combustion quality is better. By analyzing the operating cyclical variations of the prototype, the coefficient of variation (COV) of the compression ratio is found to be higher than 27%. While the peak in-cylinder gas pressure and pressure rising ratio cyclical variation can maintain a stable operation (similar to the conventional diesel engines), higher COVs of the compression ratio can always complicates the engine combustion. Therefore proper control strategies are necessary for the FPDLG.
机译：自由活塞式柴油发动机线性发电机（FPDLG）由于其独特的结构和运行特性而具有许多优点。因此，大多数研究人员主要研究FPDLG特性。但是，没有关于发动机运转特性的报告。因此，本文着重研究了FPDLG发动机在发电过程中的运转特性。根据实验结果，设计原型的输出功率可达5.16 kW，热效率高达38.5％。获得了实验测试结果，并按时间和曲柄角坐标进行了处理。与传统的柴油发动机相比，FPDLG的点火延迟更短，预混物的燃烧质量更好。通过分析原型的工作周期变化，发现压缩比的变化系数（COV）高于27％。气缸内峰值气体压力和增压比的周期性变化可以保持稳定的运行（类似于常规柴油发动机），压缩比的较高COV总是会使发动机燃烧复杂化。因此，FPDLG必须采取适当的控制策略。

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