Effect of water injection on the knock, combustion, and emissions of a direct injection gasoline engine

Li, Aqian; Zheng, Zhimin; Peng, Tao

doi:10.1016/j.fuel.2020.117376

Cited by 79 publications

(35 citation statements)

References 35 publications

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“…In the process of flame propagation, the temperature and pressure in the cylinder increased such that the terminal mixture was subjected to greater heat radiation and greater . Average pressure and temperature at different spark timings (n = 5500 rpm, equivalence ratio = 1.1): (a) the average pressure in the cylinder and (b) the average temperature in the cylinder [37]. Figure 4a shows the instantaneous heat release rate profiles for different spark timings.…”

Section: Resultsmentioning

confidence: 99%

“…The cumulative heat released for different spark timings was almost the same, but as the spark timing . Average pressure and temperature at different spark timings (n = 5500 rpm, equivalence ratio = 1.1): (a) the average pressure in the cylinder and (b) the average temperature in the cylinder [37]. Figure 3b shows the average in-cylinder temperature profiles for different spark timings.…”

Section: Resultsmentioning

confidence: 99%

“…The basic parameters and operating conditions of the gasoline direct injection (GDI) engine are shown in Tables 1 and 2, respectively. The parameters and experimental conditions of this GDI engine and its model are the same as those in a previously published paper exploring the effect of water injection quantity on knock [37]. Table 1.…”

Section: Basic Parameters and Working Conditionsmentioning

confidence: 99%

“…The flow situation in the cylinder was very complicated and included complex phenomena, such as fluid flow, chemical reactions, and heat and mass transfer. For the specific introduction of some submodels, please refer to the previous paper [37]. The models of the two papers are the same.…”

Section: Submodels Of the Numerical Simulationmentioning

confidence: 99%

“…For example, if the amount of water injected into the cylinder is too much, the temperature in the cylinder will be significantly reduced, which will reduce the engine's power performance. Therefore, it is necessary to further explore the influence of various water injection parameters on the engine such that the various parameters can be coordinated to allow for to the greatest advantages of water injection technology [37]. Figure 17a shows the generated quantity of NO x in the process of combustion.…”

Section: The Influence Of Water Injection Temperature On Nox and Unbumentioning

confidence: 99%

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Effect of Spark Ignition Timing and Water Injection Temperature on the Knock Combustion of a GDI Engine

Zheng

2020

Energies

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A turbocharged downsizing spark ignition (SI) engine cooperating with an in-cylinder direct injection technology is one of the most effective ways to improve the power and economy of gasoline engines. However, engine knock has limited the application and development of the downsizing of gasoline engines. Water injection technology can effectively suppress the knock. In this study, a method of numerical simulation was used to explore the effect of the water injection temperature on the combustion and suppression of the knock. First of all, the knock of the gasoline engine was induced by advancing the spark timing. Then, when the other conditions were the same, different water injection temperatures were set. The results show that lowering the water injection temperature reduced the knock intensity in the cylinder, but increasing the water injection temperature made the water distribution more uniform, and the peak values of each monitoring point were more consistent. The circulating work power increased with the increase of the water injection temperature. For emissions, as the temperature of the water injection increased, the emissions of soot and unburned hydrocarbons (UHCs) decreased, and NOx slightly increased.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Basic Parameters and Working Conditionsmentioning

confidence: 99%

Section: Submodels Of the Numerical Simulationmentioning

confidence: 99%

Section: The Influence Of Water Injection Temperature On Nox and Unbumentioning

confidence: 99%

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Effect of Spark Ignition Timing and Water Injection Temperature on the Knock Combustion of a GDI Engine

Zheng

2020

Energies

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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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Effect of port water injection on suppressing knock in gasoline direct injection engines

Dai

zheng

Song

2022

Energy Science & Engineering

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The effect of different port water injection (PWI) ratios on the knock in gasoline direct injection engines is explored. First, a simulation study is carried out under knock conditions to explore the time and location of the knock and the chemical mechanism that causes it. Second, water injection amount to 10%, 20%, 30%, and 40% are set to explore the effects of different water injection ratios on knocking. The influence of the different water injection ratios on the chemical mechanism of knocking is evaluated and that of the chemical mechanism on the in‐cylinder temperature and the impact of heat release rate (HRR) is explored. The results show that PWI can effectively reduce the occurrence of spontaneous combustion in the cylinder by reducing the flame propagation speed. On one hand, the changes in the low‐temperature reaction substances CH2O and HRR tend to be consistent and the peaks of CH2O and HRR move back with the increase in water injection. So, different ratios of PWI can affect the flame propagation speed by affecting the generation and consumption of CH2O, OH radicals, and HCO radicals. Also, PWI can significantly reduce the generation of in‐cylinder OH radicals, ultimately suppressing the generation of the high‐temperature stage. In addition, PWI can effectively reduce the mean temperature and mean pressure. Compared to other water injection ratios, a 30% water injection ratio is the most effective at inhibiting knocking. At this time, the knocking intensity is the lowest, and the cycle power reaches its maximum of 1120 J.

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Effect of water injection on the knock, combustion, and emissions of a direct injection gasoline engine

Cited by 79 publications

References 35 publications

Effect of Spark Ignition Timing and Water Injection Temperature on the Knock Combustion of a GDI Engine

Effect of Spark Ignition Timing and Water Injection Temperature on the Knock Combustion of a GDI Engine

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

Effect of port water injection on suppressing knock in gasoline direct injection engines

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