Investigation into the application of turbulent jet ignition in the operational process of free piston engine generators

In response to the bottleneck issues faced by free piston engine generator, such as slow combustion heat release rate leading to long combustion duration and low power density, this study presents the first application of turbulent jet ignition technology to a two stroke FPEG system. Taking the dual-cylinder FPEG as the research object, a passive pre-chamber suitable for FPEG was designed. A computational fluid dynamics simulation model was established, and the model was calibrated using experimental data. This research investigates how TJI can effectively overcome the limitations of traditional spark ignition in achieving rapid combustion. The research results indicate that the TJI FPEG demonstrated significant improvements in combustion efficiency and stability, while effectively controlling the peak in-cylinder pressure within the optimal range. Compared with the SI FPEG, under the calibration condition, the combustion duration of the TJI FPEG was reduced by 6.9 %, the indicated power increased to 2.43 kW, and the indicated thermal efficiency reached 35.8 %.