Research on Piston Dynamics and Engine Performances of a Free-Piston Engine Linear Generator Coupling with Various Rebound Devices

Free-piston engine linear generators (FPELGs) are an innovative power device that exhibits the distinctive dynamics of pistons and performance free-piston engines. Furthermore, single-cylinder/single-piston FPELG structure type has more advantages than other types, including a straightforward ease control. However, when coupled with various rebound devices, operational characteristics piston FPELGs quite different. Therefore, this paper aims to quantitatively compare types device. The results indicate equivalent stiffness gas spring is greater mechanical spring, operating frequency will be higher spring. During compression stroke, velocity changes linearly, while nonlinearly. springs have shorter expansion durations compared those springs. In addition, indicated powers ideal 1.5 kW 1.3 kW, respectively. due leakage, thermal efficiency actual reduced by approximately 2.5% operation positively correlated as increases, combustion process becomes close isovolumetric process. in increasing initial pressure similar