An experimental study of the cycle stability of hydraulic free-piston engines

Zhao, Zhenfeng; Zhang, Fujun; Huang, Ying; Zhao, Changlu

doi:10.1016/j.applthermaleng.2013.02.033

Cited by 23 publications

(7 citation statements)

References 8 publications

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“…Zuo et al analyzed the engine scavenging using multi-dimensional numerical model to evaluate the scavenging performance for a free-piston linear alternator (FPLA) [32]. Zhao investigated the cycle-to-cycle variations in the piston dynamics and cycle stability of hydraulic free-piston engines (HFPEs) based on the experimental study of a prototype of the single-piston HFPE [5,33].…”

Section: Free-piston Enginementioning

confidence: 99%

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Experimental study of the operation characteristics of an air-driven free-piston linear expander

et al. 2017

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Free-piston engine is a kind of linear internal combustion engine, and shows advantages on simple mechanical structure, low frictional losses, high thermal efficiency and operational flexibility. In this research, an experimental test rig of a dual-piston air-driven free-piston linear expander (FPLE) is established using the FPE concept. A linear generator is used to convert the mechanical work of the pistons into electricity during the expansion process. The piston dynamics, the output voltage of the generator, and the expander operation frequency, as well as the system energy conversion efficiency are identified. It is observed that the piston displacement profile is similar with a sinusoidal wave. The piston is found to run at relative high speed during the middle stroke, and peak velocity is usually achieved when the piston approaches the middle stroke. The output voltage of the generator is sensitive with the piston velocity. With higher driven pressure, the expander frequency is higher. The energy conversion efficiency increases with higher driven pressure and can reach up to 55% with a driven pressure of 3.75 bar. This research presents a fundamental analysis of a FPLE prototype, which can be used as a guidance for the future design of this FPLE type.

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Section: Free-piston Enginementioning

confidence: 99%

“…Therefore, the free-piston engines as an alternative to conventional engines have invoked the attention in hydraulic and electric power generation applications in recent years [5][6][7][8][9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Experimental study of the operation characteristics of an air-driven free-piston linear expander

et al. 2017

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“…They can directly convert the indicator work into fluid pressure energy, and the efficiency is high, but there are many problems in HFPE, such as unstable work, complex control, and more technical bottlenecks, so it has not been available to shape products. In the study of HFPE dynamics, Zhao Zhenfeng, Wu Wei, Wei Chao successfully established the HFPE nonlinear dynamic model and completed the experimental study [7][8][9][10] . For HCPE, the literature [11][12][13][14][15] emphasizes the advantages of good technical inheritance, good performance and other characteristics, but from the structural principle of its comparison with the traditional internal combustion engine, it is not difficult to find that the HCPE body is high, the vibration is violent, so it is difficult to popularize.…”

Section: Introductionmentioning

confidence: 99%

Working Process Modeling and Performance Simulation of Half-Crank Internal Combustion Pump

Jiao¹,

Fu²,

Zhao³

2017

Proceedings of the Advances in Materials, Machinery, Electrical Engineering (AMMEE 2017)

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Half-Crank Internal Combustion Pump (HICP) is a new type agricultural power machine converting indicated work into pressure energy, whose crankshaft comprises only half a crank, reciprocating inertial forces of cylinders can entirely counteract each other, the structure is simple and compact, the route of energy transferring is shorter, the technologies based on are mature also. Considering the nonlinear factors including friction, coupling of fluid-solid-gas, etc., and the collaborative mechanism between many disciplines, the dynamic model of HICP is constructed to solve the transient movement and force. Facing the whole working process simulation of HICP, the stationary point iteration method through adjusting the output pressure to arrive at steady working state, is designed, so, the time course of every movement and force during one working cycle can be gotten for the analysis of power and economic performance. The evaluating index system of the performance of HICP was provided also. Through simulation, when throttle changes between 30%~100% and rotational speed changes between 900r/min~2300r/min, the output pressure and fuel consumption changed within 1.923Mpa~10.554Mpa and 220.0333g/(kW• h)~365.9479 g/(kW• h) respectively. The pressure is slightly influenced by rotational speed. Fuel consumption shows a middle concave shape and the best point is around the rotational speed of 1300r/min, and the fuel throttle of 70%. The nonlinear dynamic model and simulation method effectively realized the working process and performance simulation of HICP, of course, is suitable for many other machines also, and the simulation precision is decided by the boundary conditions.

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“…Several control schemes, such as the prediction of TDC and BDC with respect to engine control parameters [19][20][21][22][23][24][25] and combustion mode transition between spark ignition (SI) and HCCI [26], were proposed and modeled. However, the number of related studies or analysis with experimental results were few due to the difficulties in realization.…”

Section: Introductionmentioning

confidence: 99%

The operation characteristics of a liquefied petroleum gas (LPG) spark-ignition free piston engine

Kim

Bae

Kim

2016

Fuel

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An experimental study of the cycle stability of hydraulic free-piston engines

Cited by 23 publications

References 8 publications

Experimental study of the operation characteristics of an air-driven free-piston linear expander

Experimental study of the operation characteristics of an air-driven free-piston linear expander

Working Process Modeling and Performance Simulation of Half-Crank Internal Combustion Pump

The operation characteristics of a liquefied petroleum gas (LPG) spark-ignition free piston engine

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