The effect of direct water injection on a diesel-gasoline reactivity controlled compression ignition engine

Kahnooji, Masoud; Yazdani, Kaveh

doi:10.1016/j.fuel.2020.119109

Cited by 11 publications

(5 citation statements)

References 39 publications

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“…The results show that the peak pressure and the peak rate of heat release rate decrease with the increase of the water volume; the peak pressure and the peak rate of heat release rate timing are slightly delayed with the increase in water IT. Kahnooji and Yazdani 36 investigated the effect of direct in-cylinder water injection on engine performance through numerical simulation on an RCCI engine. The results show that advancing the water injection timing or increasing the water mass ratio decreases the maximum pressure rise rate, indicated thermal efficiency, soot, and NOx, and increases CO and UHC.…”

Section: Introductionmentioning

confidence: 99%

Numerical simulation research on the influence of the parameters of water injection on the GDI engine

Zhang

Zheng

2022

International Journal of Engine Research

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The small enhanced technology that synergizes in-cylinder direct injection and turbocharging has good power and fuel economy, and has become a trend in the development of gasoline direct injection engines. However, the enhanced technology has sharply increased the thermal load in the cylinder. It is easy to cause engine knocks, which is currently one of the main limiting factors in improving the performance of direct injection gasoline engines. This paper discusses the influence of direct injection of water into the cylinder on the combustion of gasoline direct injection engines through numerical simulation. The gasoline engine is induced to knock by increasing the compression ratio and advancing the ignition timing. The influence of the water injector (six nozzle holes) layouts (direct water injection in the cylinder) and the water temperatures on the water movement in the cylinder and on the combustion and knock is explored. The in-cylinder water injector and the fuel injector are injected with two nozzles. Results show that when the water injector is arranged in the center of the cylinder head, the water evaporation in the cylinder before ignition is faster. Most of the water is located near the cylinder wall surface, which can reduce the temperature near the wall surface as much as possible and suppress the knock. Therefore, the effect of suppressing knocks is better. The injecting water is advantageous to make the mixed gas distribution uniform and the turbulent kinetic energy high when its temperature is low.

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Section: Introductionmentioning

confidence: 99%

Numerical simulation research on the influence of the parameters of water injection on the GDI engine

Zhang

Zheng

2022

International Journal of Engine Research

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“…High-reactivity fuels, such as diesel, are injected directly into the chamber, whereas low-reactivity fuels, such as gasoline, are delivered through the intake ports. These engines feature more effective combustion phasing control and operate better at higher loads (Kahnooji & Yazdani, 2021). The overall combustion of RCCI cases occurs earlier and its mean heat release rate (HRR) is more evenly distributed over time than that of the corresponding SCCI cases in the low and intermediate-temperature regimes.…”

Section: Introductionmentioning

confidence: 99%

Investigation on the RCCI Engine on Performance and Emission

YUSOP¹,

AZIZ²,

HAMIDI³

et al. 2022

EPSTEM

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“…But the fuel consumption increased by 2%. Kahnooji and Yazdani explored the influence of the time and ratio of direct water injection in the cylinder on the RCCI engine through three-dimensional simulation. The results showed that direct water injection in the cylinder increased the maximum affordable load by reducing the maximum pressure rise rate (MPRR).…”

Section: Introductionmentioning

confidence: 99%

A Simulation Study of Water Injection Position and Pressure on the Knock, Combustion, and Emissions of a Direct Injection Gasoline Engine

Zheng

Song³

2021

ACS Omega

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A turbocharged downsizing spark ignition (SI) engine combined with direct injection technology has the potential to improve the power and fuel economy and reduce emissions. However, gasoline engines are prone to knocking under low-speed and high-load conditions, which limits the application and development of downsizing SI engines. In this study, numerical simulation methods are used to explore the feasibility of water injection in the intake port to reduce the knock tendency of gasoline direct injection (GDI) engines and to explore the effects of different water injection pressures on combustion and emissions. First, the GDI engine is induced to knock by increasing the compression ratio and advancing the spark timing. Then, the influences of low position and no angle (LPNA) and high position and angled water injector arrangements on engine combustion are explored. When the water injector arrangement is LPNA, the turbulent kinetic energy near the spark plug is higher, the equivalence ratio is more evenly distributed, and the engine knock intensity is smaller. Finally, when the arrangement of the water injector is LPNA, the effects of water injection pressure on the knock, combustion, and emissions of the GDI engine are explored. The results show that when the water injection pressure is 5 bar, the knock intensity of the engine is the smallest, the cycle work is the highest, and the emissions of NO x and unburned hydrocarbon are the lowest.

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The effect of direct water injection on a diesel-gasoline reactivity controlled compression ignition engine

Cited by 11 publications

References 39 publications

Numerical simulation research on the influence of the parameters of water injection on the GDI engine

Numerical simulation research on the influence of the parameters of water injection on the GDI engine

Investigation on the RCCI Engine on Performance and Emission

A Simulation Study of Water Injection Position and Pressure on the Knock, Combustion, and Emissions of a Direct Injection Gasoline Engine

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