Effects of injection pressure on ignition and combustion characteristics of impinging diesel spray

Du, Wei; Zhang, Qiankun; Zhang, Zheng; Lou, Juejue; Bao, Wenhua

doi:10.1016/j.apenergy.2018.06.032

Cited by 58 publications

(16 citation statements)

References 42 publications

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“…Another basic study is presented in Du et al (2018), where the influence of injection pressure on diesel spray development was analysed in a constant volume combustion chamber. Increasing levels of this parameter led to better atomization and evaporation of fuel droplets, reducing the combustion duration.…”

Section: Influence Of Rail Pressure Control On Pressure and Heat Relementioning

confidence: 99%

Effects of rail pressure control on fuel consumption, emissions and combustion parameters in a turbocharged diesel engine

Zamboni

Capobianco

2020

Cogent Engineering

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The influence of rail pressure control on fuel consumption, emissions and combustion in an automotive downsized turbocharged diesel engine was investigated, considering different operating modes in three-part load working conditions. These modes were selected according to the results of a previous step of the study, where low NO X and fuel consumption levels were obtained managing a hybrid exhaust gas recirculation (EGR) system and the turbocharger variable nozzle turbine (VNT). Aiming at limiting observed soot penalties, increased values of rail pressure were applied, deepening the interactions with engine-controlled sub-assemblies and the related variations in operating, environmental, energy and combustion parameters. At low levels of engine speed and load, major reduction in NO X emissions and fuel consumption were observed, with acceptable soot and noise combustion increase, while turbocharger speed was also enhanced. No variations in fuel consumption were achieved at higher load and speed, while soot penalty remained significant. A simplified method to describe and model engine behaviour and combustion process was also developed, defining linear relationships between rail pressure and engine quantities, including a wide set of combustion parameters derived from in-cylinder pressure diagrams and heat release curves.

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Section: Influence Of Rail Pressure Control On Pressure and Heat Relementioning

confidence: 99%

Effects of rail pressure control on fuel consumption, emissions and combustion parameters in a turbocharged diesel engine

Zamboni

Capobianco

2020

Cogent Engineering

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“…Moreover, the higher momentum of small droplets resulted in the enlargement of the spray area. In reference [12], diesel spray was analysed in a constant volume combustion chamber, assessing that the increase of injection pressure resulted in a better atomisation of fuel droplets. As a consequence, evaporation and mixture formation were enhanced, leading to a shorter combustion duration.…”

Section: Effects Of Rail Pressure Controlmentioning

confidence: 99%

Influence of Fuel Injection, Turbocharging and EGR Systems Control on Combustion Parameters in an Automotive Diesel Engine

Zamboni

2019

Applied Sciences

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Indicated pressure diagrams were measured during experimental campaigns on the control of fuel injection, turbocharging and hybrid exhaust gas recirculation systems in an automotive downsized diesel engine. Three-part load operating conditions were selected for four test sets, where strategies aimed at the reduction of NOX emissions and fuel consumption, limiting penalties in soot emissions and combustion noise were applied to the selected systems. Processing of in-cylinder pressure signal, its first derivative and curves of the rate of heat release allowed us to evaluate seven parameters related to the combustion centre and duration, maximum values of pressure, heat release and its first derivative, heat released in the premixed phase and a combustion noise indicator. Relationships between these quantities and engine operating, energy and environmental parameters were then obtained by referring to the four test sets. In the paper, the most significant links are presented and discussed, aiming at a better understanding of the influence of control variables on the combustion process and the effects on engine behaviour. The proposed methodology proved to be a consistent tool for this analysis, useful for supporting the application of alternative fuels or advanced combustion modes.

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“…They found that the combustion process shows a strong scattering at high injection pressure, but once ignition occurs at higher injection pressures, the cycle performance is better. Du et al 39 studied the spray, ignition, and combustion characteristics of impinging diesel sprays at different injection pressures in a constant volume combustion device, and Yao et al 40 studied the effects of injection pressure on ignition and combustion characteristics of diesel in methanol and air mixture environment. These previous studies have shown that under low-temperature conditions, the lower injection pressure is more conducive to the cold start ability.…”

Section: Introductionmentioning

confidence: 99%

“…41 The selection range of this threshold value is often concentrated around 10% of the saturation value. 38,39,41 However, under cold start conditions, diesel sprays often experience a development process from a cool flame to a blue flame, and then to an intense yellow flame. 43–46 Due to the lower heat release rate of the blue flame and the lower ambient temperature under cold start conditions, the heat generated by the initial flame is easily blown away from the mixed fuel area by the kinetic energy from the spray, which causes the flame to blow out, resulting in the blue flame being unable to successfully transit to yellow flame, and leads to the misfire phenomena.…”

Section: Introductionmentioning

confidence: 99%

Autoignition characteristics of diesel spray under different injection pressures and cold start strategy for compression ignition engines

Yang

Liu

2020

International Journal of Engine Research

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Poor cold start performance is one of the main factors restricting the application range of compression ignition engines. Stable flame generation in the cylinder is the prerequisite for the successful start of the engine. In order to explore ways to improve the cold start ability of the compression ignition engine, the ignition characteristics of diesel sprays at different injection pressures were studied in a constant volume combustion chamber. A high-speed photography technique was used to obtain the color images of the initial flames of diesel free sprays. And the yellow flame is introduced as the criterion for a successful flame generation. It was found that under moderate injection pressures, the reactant concentration and energy dissipation rate reached equilibrium. Under this condition, the duration of the blue flame is relatively stable, and it is most conducive to the generation of the yellow flame in the cylinder. The negative temperature coefficient phenomenon is also observed, and the temperature range in which this phenomenon occurs is identical with the change of injection pressure. A cold start strategy for the compression ignition engine is proposed by controlling the compression-end temperature in the cylinder to be higher than the threshold ignition temperature of diesel spray.

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Effects of injection pressure on ignition and combustion characteristics of impinging diesel spray

Cited by 58 publications

References 42 publications

Effects of rail pressure control on fuel consumption, emissions and combustion parameters in a turbocharged diesel engine

Effects of rail pressure control on fuel consumption, emissions and combustion parameters in a turbocharged diesel engine

Influence of Fuel Injection, Turbocharging and EGR Systems Control on Combustion Parameters in an Automotive Diesel Engine

Autoignition characteristics of diesel spray under different injection pressures and cold start strategy for compression ignition engines

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