Analysis on Energy-Flow of a Bipropellant-Powered Hydraulic Free Piston Engine

Xia, Bi Zhong; Su, Gang; Xie, Haibo; Yang, Hua

doi:10.4028/www.scientific.net/amm.121-126.3102

Cited by 1 publication

(1 citation statement)

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“…By connecting the pistons with a hydraulic plunger, this engine can translate reciprocating motion into hydraulic energy and output power in a non-rigid pattern. An HFPE does not have any crank-link mechanism or oblique plate mechanism; these two kinds of mechanisms are very common in conventional engines and plunger pumps [4,5]; the differences between an HFPE and a traditional engine-pump combination are shown in Figure 1. The HFPE has some advantages, such as a more compact structure, fewer parts and lighter weight; the efficiency of synthetic transmission and friction loss are better than those of a conventional engine.…”

Section: The History Of Hfpesmentioning

confidence: 99%

Research on the Operating Characteristics of Hydraulic Free-Piston Engines: A Systematic Review and Meta-Analysis

Zhang

Zhao

et al. 2021

Energies

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The hydraulic free-piston engine (HFPE) is a kind of hybrid-powered machine which combines the reciprocating piston-type internal combustion engine and the plunger pump as a whole. In recent years, the HFPE has been investigated by a number of research groups worldwide due to its potential advantages of high efficiency, energy savings, reduced emissions and multi-fuel operation. Therefore, our study aimed to assess the operating characteristics, core questions and research progress of HFPEs via a systematic review and meta-analysis. We included operational control, starting characteristics, misfire characteristics, in-cylinder working processes and operating stability. We conducted the literature search using electronic databases. The research on HFPEs has mainly concentrated on four kinds of free-piston engine, according to piston arrangement form: single piston, dual pistons, opposed pistons and four-cylinder complex configuration. HFPE research in China is mainly conducted in Zhejiang University, Tianjin University, Jilin University and the Beijing Institute of Technology. In addition, in China, research has mainly focused on the in-cylinder combustion process while a piston is free by considering in-cylinder combustion machinery and piston dynamics. Regarding future research, it is very important that we solve the instabilities brought about by chance fluctuations in the combustion process, which will involve the hydraulic system’s efficiency, the cyclical variation, the method of predicting instability and the recovery after instability.

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Section: The History Of Hfpesmentioning

confidence: 99%