Effects of Injector Spray Layout and Injection Strategy on Gas Mixture Quality of Gasoline Direct Injection Engine

Du, Aimin; Zhu, Zhongpan; Chu, Chuanchuan; Li, Mengmeng

doi:10.4271/2015-01-0747

Cited by 3 publications

(5 citation statements)

References 7 publications

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“…Additional heat is released after 40 CAD, and this decreases the thermal efficiency. The previous study 36 suggests that although the global equivalence ratio in the cylinder is nearly the same at different crank degrees after the injection, the local equivalence ratio near the spark plug significantly varies over time. With crank degrees increasing, the local equivalence ratio near the spark plug first decreases and then increases.…”

Section: Performance Parameters By Single Injection Strategymentioning

confidence: 87%

“…When the SOI corresponds to −240 CAD, the end gas has sufficient time to auto-ignite prior to the flame spreading to the position of the end gas. Conversely, the late injection timing increases turbulent kinetic energy 35 and promotes the mixture stratification with lean mixture near the wall, 36 which accelerates the propagation of spark-induced deflagrative flame and prolongs the ignition delay of the end-gas. It can be found from Figure 5 that Single −210 has the shortest CA10-90 when the ST corresponds to −24 CAD, which indicates that the overall combustion is most enhanced for this case.…”

Section: Assessment Of Single Injection Strategymentioning

confidence: 99%

“…Third, although the average equivalence ratio of the double injection is the same as that of the single injection, the equivalence ratio of double injection near the spark is slightly higher, and this improves ignition conditions and promotes flame speed. 36,40 Finally, lower in-cylinder temperature is obtained by a double injection. Figure 11 shows the average temperature evolutions of different double injections relative to the crank angle.…”

Section: Assessment Of Double Injection Strategymentioning

confidence: 99%

“…With crank degrees increasing, the local equivalence ratio near the spark plug first decreases and then increases. 36 An earlier SOI can result in sufficient time to increase the local equivalence ratio near the spark, and this is beneficial to spark and combustion. The SOI of 2120 CAD is too late to form a rich mixture near the spark plug, so that the combustion is deteriorated.…”

Section: Performance Parameters By Single Injection Strategymentioning

confidence: 99%

See 3 more Smart Citations

Influence of injection strategies on knock resistance and combustion characteristics in a DISI engine

Wei

Shao

et al. 2018

Proceedings of the Institution of Mechanical Engineers, Part D:

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The combustion of a direct injection spark ignition engine is significantly affected by the fuel injection strategy due to the impact this strategy has on the gas-mixture formation and the turbulence flow. However, comprehensive assessments on both knock and engine performances for different injection strategies are generally lacking. Therefore, the main objective of the present study is to provide an experimental evidence of how a single injection strategy and a split injection strategy compare in terms of both knock tendency and engine performances like thermal efficiency, torque and combustion stability. Starting from the optimization of a single injection strategy, a split injection strategy is then evaluated. Under the present operating conditions, an optimum secondary injection timing of 100 CAD BTDC is found to have significant improvements on both the knock resistance and the overall engine performances. It should be noted that the present results indicate that the relationship between double injection and anti-knock performance is not monotonous. In addition, the double injection shows superior potential in improving fuel economy and power performance in contrast with the single injection thanks to a more stable combustion when a late injection timing is applied.

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Section: Performance Parameters By Single Injection Strategymentioning

confidence: 87%

Section: Assessment Of Single Injection Strategymentioning

confidence: 99%

Section: Assessment Of Double Injection Strategymentioning

confidence: 99%

Section: Performance Parameters By Single Injection Strategymentioning

confidence: 99%

See 2 more Smart Citations

Influence of injection strategies on knock resistance and combustion characteristics in a DISI engine

Wei

Shao

et al. 2018

Proceedings of the Institution of Mechanical Engineers, Part D:

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show abstract

“…Сучасні дослідження впливу підготовки газових сумішей на їх якість, й, як наслідок, на процес їх згоряння, стосуються здебільшого покращення екологічних показників бензинових двигунів. Наприклад, в роботі [17] якість суміші двигуна DISI. А в роботі [18] дослід жено вплив структури сопла на однорідність газової суміші судового газового двигуна, й подальше згоряння й викиди.…”

Section: вступunclassified

Числове Дослідження Змішування В Системі Генерації Газової Суміші

Гайдачук¹,

Шипуль²,

Заклінський³

et al. 2021

aktt

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The subject of research is a gas-dynamic process of mixture formation with a given component mass fraction during overflow through the mixer nozzles in the mixture generation system. The aim of the study is the scientific and experimental evaluation of the mixer technical solutions to ensure the accuracy and homogeneity of the gas mixture. The current work conducts numerical study on the flow of a gas flow through the mixer nozzles of the mixture generation system, ensuring its stoichiometric component composition and homogeneity. The problem is solved by developing adequate mathematical models of gas-dynamic flow and analyzing the results of numerical simulations. The following results were obtained. A mixer with the nozzles in the mixture generation system has been created and a technical solution for its design has been scientifically substantiated. The areas of flow sections of mixer nozzles are experimentally established. A mathematical model of generating a mixture with a given component mass fraction was developed and a series of numerical experiments was conducted to study its overflow through the mixer. A 3D simulation was conducted using ANSYS CFX software. The stationary formulation of the problem is applied. In the nozzles of closed overflow of the mixer, the heat exchange of the gas flow with the walls is taken into account by solving a separate problem and determining the corresponding heat transfer coefficients. At the inputs to the mixer, the ratio of the initial pressure of the components of the mixture is determined, which ensures its stoichiometric composition. The fields of the gas flow velocities, the mass flow rate of the components of the gas mixture through the mixer, and pressure and temperature fields are obtained. Based on the simulation results, it was found that the design of the developed mixer ensures the creation of a gas mixture with a homogeneity of at least 3%. With a constant pressure ratio of the mixture components to the mixer inlet, the gas mixturedosing accuracy can be achieved at least 1%.

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Improvement of engine performance with high compression ratio based on knock suppression using Miller cycle with boost pressure and split injection

Wei

Zhou

2019

Front. Energy

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Effects of Injector Spray Layout and Injection Strategy on Gas Mixture Quality of Gasoline Direct Injection Engine

Cited by 3 publications

References 7 publications

Influence of injection strategies on knock resistance and combustion characteristics in a DISI engine

Influence of injection strategies on knock resistance and combustion characteristics in a DISI engine

Числове Дослідження Змішування В Системі Генерації Газової Суміші

Improvement of engine performance with high compression ratio based on knock suppression using Miller cycle with boost pressure and split injection

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