A Numerical Study of a Free Piston IC Engine Operating on Homogeneous Charge Compression Ignition Combustion

Goldsborough, S. Scott; Blarigan, Peter Van

doi:10.4271/1999-01-0619

Cited by 101 publications

(56 citation statements)

References 18 publications

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“…However, limited by the factors summarised in [2], the research on these types of free piston engines stagnated after the 1960s. In recent decades, dramatic developments in the technologies of electrical motors and electronic control have made it possible to address the research difficulties of free piston engines, and most importantly, extended the research concerns to applications of a free piston engine coupled with a linear motor or a hydraulic sub-system [9][10][11][12][13][14][15][16][17][18]. The compression ignition (CI) free piston engine coupled with a linear motor (FPLG) is the very type of free piston engine studied in this paper, and a detailed illustration of structure and the operating principle of this type of free piston engine can be found in [2].…”

Section: Introductionmentioning

confidence: 99%

Study of the Injection Control Strategies of a Compression Ignition Free Piston Engine Linear Generator in a One-Stroke Starting Process

et al. 2016

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For a compression ignition (CI) free piston engine linear generator (FPLG), injection timing is one of the most important parameters that affect its performance, especially for the one-stroke starting operation mode. In this paper, two injection control strategies are proposed using piston position and velocity signals. It was found experimentally that the injection timing's influence on the compression ratio, the peak in-cylinder gas pressure and the indicated work (IW) is different from that of traditional reciprocating CI engines. The maximum IW of the ignition starting cylinder, say left cylinder (LC) and the right cylinder (RC) are 132.7 J and 138.1 J, respectively. The thermal-dynamic model for simulating the working processes of the FPLG are built and verified by experimental results. The numerical simulation results show that the running instability and imbalance between LC and RC are the obvious characters when adopting the injection strategy of the velocity feedback. These could be solved by setting different triggering velocity thresholds for the two cylinders. The IW output from the FPLG under this strategy is higher than that of adopting the position feedback strategy, and the maximum IW of the RC could reach 162.3 J. Under this strategy, the prototype is able to achieve better starting conditions and could operate continuously for dozens of cycles.

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Section: Introductionmentioning

confidence: 99%

Study of the Injection Control Strategies of a Compression Ignition Free Piston Engine Linear Generator in a One-Stroke Starting Process

et al. 2016

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“…Besides, the variation of compression ratio in FPLE also allows the engine to operate with various kinds of fuels 4) . Goldsborough 5) presented a numerical study of a free piston linear engine with dual piston type. The simulation results indicated that the operating compression ratio of engine was variable, and it particularly depended on the operating conditions of the engine such as equivalence ratio, scavenging efficiency, intake temperature, etc.…”

Section: Introductionmentioning

confidence: 99%

Simulation of SI-HCCI Transition in a Two-Stroke Free Piston Engine Fuelled with Hydrogen

Hung¹,

Park²

2013

Transactions of the Korean hydrogen and new energy society

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>> A free piston linear engine could be operated under HCCI combustion due to its variable compression ratios. To obtain HCCI combustion, the free piston linear engine needs a high compression ratio to achieve auto-ignition of the fuel/air mixture. In this study, an idea for obtaining a high compression ratio using the transition from SI combustion to HCCI combustion was proposed. The fuel used in this study is hydrogen, which is considered to be an environmentally friendly fuel. Besides, the effects of key parameters such as equivalence ratio (ϕ), load resistance (RL) and intake temperature (Tin) on the SI-HCCI transition were numerically investigated. The simulation results show that the SI-HCCI transition is successful without any significant reduction of in-cylinder pressure as the intake temperature is increased from Tin=300K (SI mode) to Tin=450K (HCCI mode), while the load resistance and equivalence ratio are retained respectively at RL=120Ω and ϕ=0.6 in both SI mode and HCCI mode.

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“…For FPLA, a much narrow range of operating speeds is expected to be utilized, which is due to the electrical generating scheme employed by the device [23]. Therefore, the opening proportion of the throttle is confined to low speed range.…”

Section: Effects Of Dimensionless Input Energymentioning

confidence: 99%

“…The piston motion profile was described with two arrays of numbers, one of which represented the ECA (Here ECA is equivalent crank angle which is used to note the port timings. However, it is only a time notation since the free-piston engine does not have a crankshaft to define the piston's motion and ECA= t·f·360 [23,24,25]) and the other represented the displacement of the piston, and then the file was imported into the CFD code directly. Since there was no coupling between CFD code and free piston's motion, the dynamics was adjusted depending on the desired operating frequency and the stroke of the free-piston engine in the zero-dimensional FPLA simulating program.…”

Section: Combustion Modeling Of Fplamentioning

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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A Numerical Study of a Free Piston IC Engine Operating on Homogeneous Charge Compression Ignition Combustion

Cited by 101 publications

References 18 publications

Study of the Injection Control Strategies of a Compression Ignition Free Piston Engine Linear Generator in a One-Stroke Starting Process

Study of the Injection Control Strategies of a Compression Ignition Free Piston Engine Linear Generator in a One-Stroke Starting Process

Simulation of SI-HCCI Transition in a Two-Stroke Free Piston Engine Fuelled with Hydrogen

Dimensionless Parametric Analysis of Spark Ignited Free-Piston Linear Alternator

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