Research on a Dual-Chamber Stratified Charge Engine

Hull, William L.; Sorenson, Spencer C.

doi:10.4271/780488

Cited by 3 publications

(4 citation statements)

References 9 publications

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“…The cross section area was used as the flame area while the true flame area should somewhat be like a spherical one. From the photograph study, a jet structure was observed at the orifice outlet for the small orifice (Hull and Sorenson 1978). This jet structure can not be described by the one-dimensional model, although the turbulence level has been correlated for the effect of throat diameter.…”

Section: Spark Timingmentioning

confidence: 97%

“…Boni, et al, (1976) developed a one-dimensional model for a divided chamber, stratified charge engine, as did Dwyer, et al, (1976) for a prechamber of a stratified charge engine. Sorenson (1978) has simulated turbulent combustion in a single constant volume chamber.…”

Section: Engine Modelingmentioning

confidence: 99%

“…(IV ' 21) where c = local acoustic velocity [in/sec] The time step size calculated from CFL condition is used as the maximum time step allowed.…”

Section: Axmentioning

confidence: 99%

“…Figure 10give the effect of the turbulent diffusivity on the calculated pressure time history and mass fraction burned. The data of the mass fraction burned was estimated from the -photographs of the engine combustion(Hull and Sorenson, 1978). The mass fraction burned curve was calculated through the empirical equation(Miller, et al, 1954), e-e Mass fraction burned = ^[1 -cos(-r-r-• IT)] (IV.26) c where 0 = initial angle of combustion AG = crank angle duration for combustion.…”

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confidence: 99%

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Improving the performance and fuel consumption of dual chamber stratified charge spark ignition engines

Sorenson¹,

Pan²,

Bruckbauer³

et al. 1979

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A one-dimensional mathematical model for the simulation of the combustion process in a dual chamber stratified charge spark ignition engine has been developed. The model includes the submodels of ignition, mixing, chemical kinetics, heat transfer, turbulent diffusivity, and NO formation. A superimposed Gaussian distribution function for the temperature and species is used for the ignition simulation. Three mixing zones: the perfectly mixed prechamber, and a perfectly mixed and an unmixed zone in the main chamber, are assumed for the mixing model. An empirical rate equation assuming a reaction which is first order in fuel and first order in oxygen with an empirical pressure correction is used for the chemical kinetic model. The heat loss is calculated through a modification of Woschni's equation. Turbulence phenomena are simulated by a simple mixing length theory with an empirical effect of throat diameter change. The simple Zeldovich mechanism is used for the NO calculation. Studies are made on the basic parameters, such as the turbulence level, the preexponential constant, the heat transfer, the mixing percentage, the total air fuel ratio,; .he prechamber intake air fuel ratio, the prechamber intake mass flow ratio, the volumetric efficiency, the throat diameter, and the spark location and timing. The calculated results correlate well with the experimental data. All the predicted trends agree with the experimental trends over the range of the engine conditions investigated. The model will be useful for the improvement of the performance and the design of the dual chamber stratified charge spark ignition i engines.

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Section: Spark Timingmentioning

confidence: 97%

Section: Engine Modelingmentioning

confidence: 99%

“…(IV ' 21) where c = local acoustic velocity [in/sec] The time step size calculated from CFL condition is used as the maximum time step allowed.…”

Section: Axmentioning

confidence: 99%

mentioning

confidence: 99%

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