Numerical investigation of water injection quantity and water injection timing on the thermodynamics, combustion and emissions in a hydrogen enriched lean-burn natural gas SI engine

Wang, Jinfei; Duan, Xiongbo; Liu, Yiqun; Wang, Wukun; Liu, Jingping; Lai, Ming‐Chia; Li, Yangyang; Guo, Genmiao

doi:10.1016/j.ijhydene.2020.04.146

Cited by 48 publications

(22 citation statements)

References 42 publications

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“…Water injection and ignition timing modification can overcome the challenge of power reduction by hydrogen injection and successfully reduce NOx emission (18,(20)(21)(22)(23)(24). Start of combustion (or spark timing) is an important parameter which can affect the performance of the hydrogen-gasoline fueled engines (18 , 21, 25, 26).…”

Section: Introductionmentioning

confidence: 99%

Multi-objective optimization of the engine performance and emissions for a hydrogen/gasoline dual-fuel engine equipped with the port water injection system

Salek

Babaie

Hosseini

et al. 2021

International Journal of Hydrogen Energy

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Section: Introductionmentioning

confidence: 99%

Multi-objective optimization of the engine performance and emissions for a hydrogen/gasoline dual-fuel engine equipped with the port water injection system

Salek

Babaie

Hosseini

et al. 2021

International Journal of Hydrogen Energy

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“…One predictive combustion model, the SI turbulent model, predicts the burn rate for homogeneous charges and plays a crucial role in the control application. Even in the high nonlinear conditions where the engine equipped the EGR, water injection, and hydrogen enriched control, the SI turbulent model showed a great fidelity with the computational efficiency [ 29 , 30 ]. The SI turbulent model comprises two subparts of laminar flame speed calculation and entrainment/burn-up.…”

Section: Introductionmentioning

confidence: 99%

Minimization of Torque Deviation of Cylinder Deactivation Engine through 48V Mild-Hybrid Starter-Generator Control

Shin¹,

Jung

Han

et al. 2021

Sensors

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Cylinder deactivation (CDA) is an effective technique to improve fuel economy in spark ignition (SI) engines. This technique enhances volumetric efficiency and reduces throttling loss. However, practical implementation is restricted due to torque fluctuations between individual cylinders that cause noise, vibration, and harshness (NVH) issues. To ease torque deviation of the CDA, we propose an in-cylinder pressure based 48V mild-hybrid starter-generator (MHSG) control strategy. The target engine realizes CDA with a specialized engine configuration of separated intake manifolds to independently control the airflow into the cylinders. To handle the complexity of the combined CDA and mild-hybrid system, GT-POWER simulation environment was integrated with a SI turbulent combustion model and 48V MHSG model with actual part specifications. The combustion model is essential for in-cylinder pressure-based control; thus, it is calibrated with actual engine experimental data. The modeling results demonstrate the precise accuracy of the engine cylinder pressures and of quantities such as MAF, MAP, BMEP, and IMEP. The proposed control algorithm also showed remarkable control performance, achieved by instantaneous torque calculation and dynamic compensation, with a 99% maximum reduction rate of engine torque deviation under target CDA operations.

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“…In addition, water vapor can buffer the combustion rate and inhibit the spontaneous combustion of the end mixture, thereby reducing the tendency of knocking. [21,22] There are three ways to apply water injection technology to an engine: inlet/intake pipe injection, direct water injection into a cylinder, and fuel-water emulsified mixing and reinjection. Compared with inlet/intake pipe injection, direct water injection into a cylinder has a better cooling effect, and the water injection amount and time can be flexibly adjusted without affecting the volumetric efficiency.…”

Section: Introductionmentioning

confidence: 99%

“…Figure21. The quantity of UHC under different crank angles and water injection times (n ¼ 5500 rpm, equivalent ratio ¼ 1.1, water injection ratio ¼ 5%).…”

mentioning

confidence: 99%

Effect of Water Injection Timing on the Combustion and Emissions of a Direct Injection Gasoline Engine

Zheng

Peng

2021

Energy Tech

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Knock is the main limiting factor of performance improvement when downsizing spark ignition (SI) engines. Direct water injection in the cylinder can effectively suppress knock. Moreover, water can absorb the heat generated by combustion and reduce the maximum temperature, which can also reduce NO X emissions. The water injection timing will change the distribution of water in the cylinder and affect the combustion and emissions of the gasoline engine. Herein, the effects of different water injection timings on the combustion and emissions of a direct injection gasoline (GDI) engine are examined with numerical simulation. For the combustion performance, the cumulative heat release in the cylinder at different timings of water injection is about 2900 J. However, the instantaneous heat release rate and the combustion duration are different. Compared with other water injection timings, when the water injection time is À80 CA, the distribution of water in the cylinder is the most even, the potential for reducing knock is the highest, and the NO X emission is the lowest, but the cycle work is also the least. When the water injection time is À20 CA, the results are opposite.

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Numerical investigation of water injection quantity and water injection timing on the thermodynamics, combustion and emissions in a hydrogen enriched lean-burn natural gas SI engine

Cited by 48 publications

References 42 publications

Multi-objective optimization of the engine performance and emissions for a hydrogen/gasoline dual-fuel engine equipped with the port water injection system

Multi-objective optimization of the engine performance and emissions for a hydrogen/gasoline dual-fuel engine equipped with the port water injection system

Minimization of Torque Deviation of Cylinder Deactivation Engine through 48V Mild-Hybrid Starter-Generator Control

Effect of Water Injection Timing on the Combustion and Emissions of a Direct Injection Gasoline Engine

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