Characteristics of Diesel Spray with Unsteady and Higher Injection Pressure Using a Rapid Compression Machine

Takahashi, Hideo; Tomaru, Katsuya; Shiga, Selichi; Karasawa, Takao; Kurabayashi, Toshio

doi:10.4271/910226

Cited by 11 publications

(5 citation statements)

References 5 publications

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“…Takahashi H. et al [11] has researched on the spray characteristics of unheated and preheated liquid bio-fuels. The researcher has concluded that increase in fuel inlet temperature improves atomization of fuel.…”

Section: Introductionmentioning

confidence: 99%

An Analysis of the Ambient Condition Effect on Biodiesel Spray Using Constant Volume Chamber

Jaat

Khalid

Ramsy

et al. 2014

AMM

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Diesel engines are high compression ignition engine which are now very vastly used for heavy vehicles and machineries. Diesel fuel is compressed under the right condition to ignite inside the constant volume chamber. Researchers have been studying for many years on ways to increase the efficiency of diesel engine as well as reduce the emission. The main idea of this research is to understand the effect of temperature on the spray characteristics, as well as fuel-air mixing characteristics. These are the characteristics responsible for ignition of diesel sprays. This research is first conducted by investigating the influence of biodiesel properties and ambient condition on the mixture formation especially at early stage of fuel-air premixing. This research was continued with injecting diesel fuel into the chamber using a Bosch common rail system. Direct photography technique with a digital camera was used to capture the real images of spray evaporation, spray length, and mixture formation with the time changes. The values of the temperature were recorded at ambient temperature, 55°C, 70°C, 85°C as well as 100°C. Injection pressure of 0.1 MPa up to 0.7 MPa was induced into the chamber with an increment of 0.1 MPa. The condition to which the fuel is affected was estimated by combining information on the block temperature, ambient temperature and photographs of the spray. The increase in block temperature increases the ambient temperature inside the chamber resulting in gain of spray area and wider spray angle. Thus predominantly promotes for a better fuel-air mixing.

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Section: Introductionmentioning

confidence: 99%

An Analysis of the Ambient Condition Effect on Biodiesel Spray Using Constant Volume Chamber

Jaat

Khalid

Ramsy

et al. 2014

AMM

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“…The rapid compression machine was applied in order to keep the wide observation region [6].A number of researchers were conducted the experiments to study on the mixture formation and combustion process was performed in Rapid Compression Machine (RCM) [1,7]. RCM is an instrument designed to stimulate a single compression event of an engine cycle of internal combustion engine.The influence of the injection process inside the combustion chamber has to be considered in the analysis of spray formation and propagation.…”

Section: Introductionmentioning

confidence: 99%

Review of the Investigation of Fuel-Air Premixing and Combustion Process Using Rapid Compression Machine and Direct Visualization System

Jaat

Khalid

Manshoor

et al. 2013

AMM

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s :This paper reviews of some applications of optical visualization system to compute the fuel-air mixing process during early stage of mixture formation and late injection in Diesel Combustion Engine. This review has shown that the mixture formation is controlled by the characteristics of the injection systems, the nature of the air swirl and turbulence in thecylinder, and spray characteristics. Few experimental works have been investigated and found that the effects of injection pressure and swirl ratio have a great effect on the mixture formation then affects to the flame development and combustion characteristics.This paper presents the significance of spray and combustion study with optical techniques access rapid compression machine that have been reported by previous researchers. Experimental results are presentedin order to provide in depth knowledge as assistance to readers interested in this research area. Analysis of flame motion and flame intensity in the combustion chamber was performed using high speed direct photographs and image analysis technique. The application of these methods to the investigation of diesel sprays highlights mechanisms which provide a better understanding of spray and combustion characteristics.

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“…Numerous research studies have been carried out on the spray and combustion characteristics of biodiesel fuel in diesel engines [5][6][7][8][9][10][11]. Furthermore, the impact of a high injection pressure as an effective method of improving the spray atomization and mixture preparation processes of diesel fuel in order to reduce PM emissions has also been reported [12][13][14][15][16]. However, few studies have reported the effect of a high injection pressure on the biodiesel spray, ignition, and soot formation characteristics.…”

Section: Introductionmentioning

confidence: 99%

Characteristics of the ignition and combustion of biodiesel fuel spray injected by a common-rail injection system for a direct-injection diesel engine

Kuti¹,

Xiangang

Zhang³

et al. 2010

Proceedings of the Institution of Mechanical Engineers, Part D:

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The effect of injection pressures at 100 MPa and 200 MPa respectively on the ignition and combustion characteristics of biodiesel fuel spray injected by a common-rail injection system for a direct-injection diesel engine was investigated. Two biodiesel fuels (namely biodiesel fuel from palm oil (BDFp) and biodiesel fuel from cooking oil (BDFc)) and JIS#2 diesel fuel were utilized in this research. The Mie scattering technique was used to characterize both the non-evaporating and the evaporating spray formation processes. The OH chemiluminescence technique was used to determine the ignition and the lift-off length of the combusting flame. Two-colour pyrometry was applied for the soot formation processes. At all injection pressures, the biodiesel fuels (especially BDFp) gave a longer spray tip penetration and a smaller spray angle under the non-evaporating conditions while the liquid-phase penetration length was longer for the biodiesel fuels than for diesel under the evaporating conditions. From estimation using a simplified model for air entrainment by the sprays, the BDFp and BDFc exhibited lower mass ratios of air to fuel than diesel did. The ignition delay was longest for the BDFc while it was shortest for the BDFp. Both the experimental and the predicted flame lift-off lengths for the BDFp were the shortest, indicating the least percentage of entrained stoichiometric air upstream. There was no significant difference between the integrated and averaged KL factors at 100 MPa injection pressure for the BDFc and diesel fuels. At 200 MPa, the BDFc presented much lower integrated and averaged KL factors than diesel did. The averaged flame temperatures of the BDFc were found to be lower than that of diesel. The oxygen content in the BDFc played a significant role in the soot formation in comparison with the oxygen from the percentage of stoichiometric air entrained upstream of the lift-off length.

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Characteristics of Diesel Spray with Unsteady and Higher Injection Pressure Using a Rapid Compression Machine

Cited by 11 publications

References 5 publications

An Analysis of the Ambient Condition Effect on Biodiesel Spray Using Constant Volume Chamber

An Analysis of the Ambient Condition Effect on Biodiesel Spray Using Constant Volume Chamber

Review of the Investigation of Fuel-Air Premixing and Combustion Process Using Rapid Compression Machine and Direct Visualization System

Characteristics of the ignition and combustion of biodiesel fuel spray injected by a common-rail injection system for a direct-injection diesel engine

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