Effect of variable stroke on fuel combustion and heat release of a free piston linear hydrogen engine

Yuan, Chenheng; Jing, Yuan; Liu, Chunzhi; He, Yonghong

doi:10.1016/j.ijhydene.2019.05.232

Cited by 28 publications

(6 citation statements)

References 26 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Sandia National Laboratories [11] University of Minnesota [45] Sandia National Laboratories [41,25] Chalmers University [63] Department of Energy Efficiency, KIER [9] Jiangsu University [69] Chongqing Jiao tong University [89,90] University of Newcastle [84] Zhengzhou School of Mechanical Engineering 2) The challenge of a stable compression process during motoring with the critical requirement of achieving a predefined in-cylinder pressure for a robust initial combustion process via the implementation of a proposed robust motoring control strategy. In recent years, industry and academia have championed the challenges of describing, controlling and optimizing the characteristic dynamics of the FPEs.…”

Section: Research Groupmentioning

confidence: 99%

A Comprehensive Review of the Free Piston Engine Generator and Its Control

Brosnan

Tian²,

Montanaro³

et al. 2023

IJAMM

View full text Add to dashboard Cite

Review A Comprehensive Review of the Free Piston Engine Generator and Its Control Patrick Brosnan 1, Guohong Tian 1, * , Umberto Montanaro 1, and Sam Cockerill 2 1 School of Mechanical Engineering Sciences, University of Surrey, Surrey GU2 7XH, UK 2 Libertine FPE Ltd., Sheffield S9 1DA, UK * Correspondence: g.tian@surrey.ac.uk; Tel.: +44-1483-300-800 Received: 2 February 2023 Accepted: 10 March 2023 Published: 23 March 2023 Abstract: The Free Piston Engine (FPE) is a unique machine with a higher thermal efficiency than its counterpart, the Conventional Reciprocating Piston Engine (CPE). The unique piston motion of the FPE is not constrained kinematically like the CPE with its connecting crankshaft and rotational inertial masses. Moreover, when directly coupled to the Linear Electric Machine (LEM) to harness electric energy production, the Free Piston Engine Generator’s (FPEG) characteristic motion, now being dynamically constrained, permits an extensive range of piston trajectory profiles to be exploited during operation. In addition, exploring varied piston trajectories during the development stages may be vital in reducing in-cylinder combustion emissions through strategies such as Low-Temperature Combustion (LTC) and Homogeneous Charge Compression Ignition (HCCI). This review paper will focus on the key motivations and drivers for continued FPEG development. It will also highlight and review its distinct advantages and challenges in being a viable solution as a future zero-carbon engine technology. Finally, FPE fundamentals, alongside its rich history, will be introduced, clearly presenting how academia and industry have described and controlled its intrinsic non-linear dynamics.

show abstract

Section: Research Groupmentioning

confidence: 99%

A Comprehensive Review of the Free Piston Engine Generator and Its Control

Brosnan

Tian²,

Montanaro³

et al. 2023

IJAMM

View full text Add to dashboard Cite

show abstract

“…They found that the raised combustion velocity of H 2 –air mixture, the enhanced degree of constant volume combustion, the improved output of power and η et , and the increased NO emissions could be obtained after adopting the pilot-ignition. Yuan et al 44 then made simulations to investigate the performance of a linear hydrogen-fueled engine (LHE). Results from simulations revealed that the LHE had higher thermal efficiency and indicated power under short stroke, but the postcombustion effect was serious.…”

Section: Current Status Of Research On Different Topics Of Hices In C...mentioning

confidence: 99%

Research and Development of Hydrogen-Fueled Internal Combustion Engines in China

Wang,

Li,

Hong

et al. 2023

ACS Omega

View full text Add to dashboard Cite

Energy shortages and environmental problems have brought many challenges to China’s development. In the field of transport, hydrogen energy has become a new type of energy that people pay attention to due to its easy production and nonpolluting generation. The use of hydrogen as a fuel in internal combustion engines can be a good way to make a low-cost and clean conversion of the current internal combustion engine, thus realizing the application of hydrogen energy in vehicles. In this study, hydrogen-fueled internal combustion engines (HICEs) are the focus. A review and analysis of the topical issues encountered in the developmental research of HICE is presented, such as the optimization control method of the combustion process, mechanism and suppression method of abnormal combustion (preignition, backfire, knock, and high pressure rise rate in early stages of combustion), influence regularity of hydrogen injection parameters and hydrogen injection modes on the formation and combustion performance of H 2 –air mixture, emissions and control of NO x , formation of H 2 –air mixture, and combustion cycle variation, among others. Multiyear studies in the hydrogen-fueled engines clearly show that abnormal combustion, as preignition, backfire, and the blockage of intake pipe, is likely to occur at high load, and the H 2 injection parameters and the injection modes possess a prominent effect on the engine’s performance and the blockage of the intake pipe, which has an important impact on the preignition and backfire, and the optimal control of the combustion process is a valuable method for resolving the contradictions among inhibiting abnormal combustion, the blockage of the intake pipe, and enhancing hydrogen-fueled engine power.

show abstract

“…C d is the duration of the combustion process, t s is the combustion starting timing, Q is the input energy from the fuel in each cycle. The significant factors affecting heat transfer were found to be the gas temperature in-cylinder, heat transfer area, and flow pattern of the cycle [39]. The heat transferred to the cylinder wall can be derived as follows:…”

Section: Numerical Modelsmentioning

confidence: 99%

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

Guo,

Wang,

Tong

et al. 2023

Energies

View full text Add to dashboard Cite

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

show abstract

Effect of variable stroke on fuel combustion and heat release of a free piston linear hydrogen engine

Cited by 28 publications

References 26 publications

A Comprehensive Review of the Free Piston Engine Generator and Its Control

A Comprehensive Review of the Free Piston Engine Generator and Its Control

Research and Development of Hydrogen-Fueled Internal Combustion Engines in China

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

Contact Info

Product

Resources

About