Motion characteristic of a free piston linear engine

Jin, Xiao; Li, Qingfeng; Huang, Zhen

doi:10.1016/j.apenergy.2009.07.005

Cited by 101 publications

(48 citation statements)

References 18 publications

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“…In addition, collision between the piston and the cylinder head may occur in the other FPE. This becomes the largest damage risk for such a system [42]. Two possible solutions are proposed to solve the aforementioned problem.…”

Section: Unsteady Flow Behavior During the Intake And Exhaust Processesmentioning

confidence: 99%

“…Furthermore, a natural frequency of operation exists if the piston working frequency is increased from 3 Hz to a different value that eliminates the piston dwell time at top or bottom dead center. In reference [42], a simulation model on the FPLA (which is similar to the FPE-LG except for combustion process) is formed in a MATLAB/Simulink environment. According to the theoretical analysis, the system can be equivalent to a linear single-degree-of-freedom discrete system with variable damping Furthermore, a natural frequency of operation exists if the piston working frequency is increased from 3 Hz to a different value that eliminates the piston dwell time at top or bottom dead center.…”

Section: Analysis Of the Actual Working Process Of The Free Piston Exmentioning

confidence: 99%

See 1 more Smart Citation

Preliminary Development of a Free Piston Expander–Linear Generator for Small-Scale Organic Rankine Cycle (ORC) Waste Heat Recovery System

Zhang

Yang

et al. 2016

Energies

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Abstract:A novel free piston expander-linear generator (FPE-LG) integrated unit was proposed to recover waste heat efficiently from vehicle engine. This integrated unit can be used in a small-scale Organic Rankine Cycle (ORC) system and can directly convert the thermodynamic energy of working fluid into electric energy. The conceptual design of the free piston expander (FPE) was introduced and discussed. A cam plate and the corresponding valve train were used to control the inlet and outlet valve timing of the FPE. The working principle of the FPE-LG was proven to be feasible using an air test rig. The indicated efficiency of the FPE was obtained from the p-V indicator diagram. The dynamic characteristics of the in-cylinder flow field during the intake and exhaust processes of the FPE were analyzed based on Fluent software and 3D numerical simulation models using a computation fluid dynamics method. Results show that the indicated efficiency of the FPE can reach 66.2% and the maximal electric power output of the FPE-LG can reach 22.7 W when the working frequency is 3 Hz and intake pressure is 0.2 MPa. Two large-scale vortices are formed during the intake process because of the non-uniform distribution of velocity and pressure. The vortex flow will convert pressure energy and kinetic energy into thermodynamic energy for the working fluid, which weakens the power capacity of the working fluid.

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Section: Unsteady Flow Behavior During the Intake And Exhaust Processesmentioning

confidence: 99%

Section: Analysis Of the Actual Working Process Of The Free Piston Exmentioning

confidence: 99%

Preliminary Development of a Free Piston Expander–Linear Generator for Small-Scale Organic Rankine Cycle (ORC) Waste Heat Recovery System

Zhang

Yang

et al. 2016

Energies

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show abstract

“…The FPLA can be considered as a nonlinear oscillation system with single freedom. 8 Equation (1) can be rewritten as…”

Section: Starting Process Analysismentioning

confidence: 99%

“…As the piston oscillation is a periodic oscillation and the amplitude remains unchanged, an equivalent stiffness can be used instead of the generalized stiffness. 8 The calculation of the equivalent stiffness is based on the equality of the energy consumed by the generalized stiffness in one stroke. The equivalent stiffness is calculated by…”

Section: Analytic Calculationmentioning

confidence: 99%

Parameters matching requirements for diesel free piston linear alternator start-up

Zuo

Feng

et al. 2015

Advances in Mechanical Engineering

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It is important to identify the relationship between the starting requirements and the structure parameters of the diesel free piston linear alternator on the structural design stage. In this article, the forces applied on the moving part during the starting process are analyzed, and an oscillation model is established. The numerical simulation results of the oscillation model are presented, and the energy-transfer mechanism is analyzed. Then, the oscillation model is simplified by utilizing the energy balance theory. Expressions of the achieved starting frequency and required starting force are derived and the effects of different design variables on them are investigated. The results show that the achieved compression ratio is determined by the energy balance between the friction consumption and the energy supplied by the starting force. The starting frequency achieved and starting force required are associated with the cylinder bore, the moving mass, and effective stroke of the engine, which can be applied to the matching design and optimization of the prototype.

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“…Therefore, the friction force is considered to be constant during the whole cycle in the calculation [13].…”

Section: System Modeling 21 Dynamic Modelingmentioning

confidence: 99%

Dimensionless Parametric Analysis of Spark Ignited Free-Piston Linear Alternator

Mao¹,

Zuo²,

Feng³

2011

Thermodynamics - Interaction Studies - Solids, Liquids and Gases

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Motion characteristic of a free piston linear engine

Cited by 101 publications

References 18 publications

Preliminary Development of a Free Piston Expander–Linear Generator for Small-Scale Organic Rankine Cycle (ORC) Waste Heat Recovery System

Preliminary Development of a Free Piston Expander–Linear Generator for Small-Scale Organic Rankine Cycle (ORC) Waste Heat Recovery System

Parameters matching requirements for diesel free piston linear alternator start-up

Dimensionless Parametric Analysis of Spark Ignited Free-Piston Linear Alternator

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