Numerical Study on the Hydrogen Fueled SI Engine Combustion Optimization through a Combined Operation of DI and PFI Strategies

This paper proposes a control-oriented chemical reaction-based two-zone combustion model designed to accurately describe the combustion process and thermal performance for spark-ignition engines. The combustion chamber is assumed to be divided into two zones: reaction and unburned zones, where the chemical reaction takes place in the reaction zone and the unburned zone contains all the unburned mixture. In contrast to the empirical pre-determined Wiebe-function-based combustion model, an ideal two-step chemical reaction mechanism is used to reliably model the detailed combustion process such as mass-fraction-burned (MFB) and rate of heat release. The interaction between two zones includes mass and heat transfer at the zone interface to have a smooth combustion process. This control-oriented model is extensively calibrated based on the experimental data to demonstrate its capability of predicting the combustion process and thermodynamic states of the in-cylinder mixture.

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Combustion Optimization in a Hydrogen-Enhanced Lean-Burn SI Engine

10.4271/2005-01-0251 ◽

2005 ◽

Cited By ~ 28

Author(s):

Joshua A. Goldwitz ◽

John B. Heywood

Keyword(s):

Si Engine ◽

Lean Burn ◽

Combustion Optimization

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Study on the Effect of Second Injection Timing on the Engine Performances of a Gasoline/Hydrogen SI Engine with Split Hydrogen Direct Injecting

Energies ◽

10.3390/en13195223 ◽

2020 ◽

Vol 13 (19) ◽

pp. 5223

Author(s):

Guanting Li ◽

Xiumin Yu ◽

Ping Sun ◽

Decheng Li

Keyword(s):

Numerical Study ◽

Direct Injection ◽

Mixture Distribution ◽

Spark Ignition ◽

Injection Timing ◽

Si Engine ◽

Excess Air ◽

Crank Angle ◽

Hc Emissions ◽

Main Factor

Split hydrogen direct injection (SHDI) has been proved capable of better efficiency and fewer emissions. Therefore, to investigate SHDI deeply, a numerical study on the effect of second injection timing was presented at a gasoline/hydrogen spark ignition (SI) engine with SHDI. With an excess air ratio of 1.5, five different second injection timings achieved five kinds of hydrogen mixture distribution (HMD), which was the main factor affecting the engine performances. With SHDI, since the HMD is manageable, the engine can achieve better efficiency and fewer emissions. When the second injection timing was 105° crank angle (CA) before top dead center (BTDC), the Pmax was the highest and the position of the Pmax was the earliest. Compared with the single hydrogen direct injection (HDI), the NOX, CO and HC emissions with SHDI were reduced by 20%, 40% and 72% respectively.

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Numerical study on effects of hydrogen direct injection on hydrogen mixture distribution, combustion and emissions of a gasoline/hydrogen SI engine under lean burn condition

International Journal of Hydrogen Energy ◽

10.1016/j.ijhydene.2019.11.048 ◽

2020 ◽

Vol 45 (3) ◽

pp. 2341-2350 ◽

Cited By ~ 1

Author(s):

Xiumin Yu ◽

Guanting Li ◽

Wei Dong ◽

Zhen Shang ◽

Zezhou Guo ◽

...

Keyword(s):

Numerical Study ◽

Direct Injection ◽

Mixture Distribution ◽

Si Engine ◽

Lean Burn ◽

Hydrogen Mixture

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Possibilities to identify engine combustion model parameters by analysis of the instantaneous crankshaft angular speed

Thermal Science ◽

10.2298/tsci120907006p ◽

2014 ◽

Vol 18 (1) ◽

pp. 97-112 ◽

Cited By ~ 3

Author(s):

Slobodan Popovic ◽

Miroljub Tomic

Keyword(s):

Combustion Process ◽

Nonlinear Least Squares ◽

Angular Speed ◽

Spark Ignition Engine ◽

Combustion Model ◽

Model Parameters ◽

Si Engine ◽

Engine Combustion ◽

Novel Method ◽

Engine Crankshaft

In this paper, novel method for obtaining information about combustion process in individual cylinders of a multi-cylinder Spark Ignition Engine based on instantaneous crankshaft angular velocity is presented. The method is based on robust box constrained Levenberg-Marquardt minimization of nonlinear Least Squares given for measured and simulated instantaneous crankshaft angular speed which is determined from the solution of the engine dynamics torque balance equation. Combination of in-house developed comprehensive Zero-Dimensional Two-Zone SI engine combustion model and analytical friction loss model in angular domain have been applied to provide sensitivity and error analysis regarding Wiebe combustion model parameters, heat transfer coefficient and compression ratio. The analysis is employed to evaluate the basic starting assumption and possibility to provide reliable combustion analysis based on instantaneous engine crankshaft angular speed.

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