The effects of design parameters on the dynamic performance, in-cylinder pressure and electrical power generation of a free piston linear engine

N. Hung, Ocktaeck Lim
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Abstract

Operation of a free piston linear engine is modeled based on the combination of three mathematical models, including a piston dynamic model, a linear alternator model and a thermodynamic model. The simulated in-cylinder pressure, piston velocity, and electric power output are compared with the corresponding experimental results to validate the models mentioned above. The influences of the design parameters, including cylinder dimension ( Le), number of coil turns ( N), and air gap ( g) between the translator and stator, on the dynamic performance, in-cylinder pressure and electric power generation of the free piston linear engine are studied. The study results show that the reduction of Le has a benefit for improving the piston dynamic performance and output electric power, however it also reduced the cylinder pressure. The increase of number of coil turns N results in the reduction of the peak piston velocity, displacement, acceleration, and pressure in the cylinder, however, it increases the output electric power of the free piston linear engine. The peak piston velocity, displacement, acceleration, and pressure in the cylinder are considerably decreased when g is reduced. However, the reduction of g has a benefit to improve the output electric power of the free piston linear engine. The energy conversion efficiency can be maximized when g and Le are reduced, and N is increased.
设计参数对自由活塞直线发动机动态性能、气缸内压力和发电量的影响
自由活塞线性发动机的运行模型是基于三个数学模型的组合,包括活塞动态模型、线性交流发电机模型和热力学模型。模拟的气缸内压力、活塞速度和电力输出与相应的实验结果进行了比较,以验证上述模型。研究了气缸尺寸(Le)、线圈匝数(N)和定子与译子之间的气隙(g)等设计参数对自由活塞直线发动机的动态性能、缸内压力和发电量的影响。研究结果表明,减少 Le 对改善活塞动态性能和输出电功率有好处,但同时也降低了气缸压力。增加线圈匝数 N 会导致活塞峰值速度、位移、加速度和气缸压力降低,但会增加自由活塞直线发动机的输出电功率。当 g 减小时,气缸中的活塞峰值速度、位移、加速度和压力都会大大降低。然而,g 值的减小有利于提高自由活塞式直线发动机的输出功率。当 g 和 Le 减小,N 增大时,能量转换效率可达到最大。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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