Characteristics of Flat-Wall Impinging Spray Flame and Its Heat Transfer under Small Diesel Engine-Like Condition. 3<sup>th</sup> Report: Effect of Oxygen Concentration

Mahmud, Rizal; Kurisu, Toru; Nishida, Keiya; Ogata, Yoichi; Akgol, Onur

doi:10.1088/1757-899x/462/1/012046

Cited by 3 publications

(4 citation statements)

References 8 publications

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“…Similarly, it was shown that the local heat flux value reached a peak at a certain spray impingement distance to the wall. 7 As described by the previous studies mentioned above, momentum loss by friction has the effect on flame velocity decrease, which closely relates to convective heat flux. For this reason, it is important to examine the combined effect on the heat flux factors which influences spray momentum.…”

Section: Introductionmentioning

confidence: 77%

“…The experiment was carried out same as of previously conducted by Mahmud et al 8,9 using high-pressure and high-temperature chamber vessel, which can be seen in Figure 1. It had four side windows.…”

Section: Experimental Apparatus and Methodsmentioning

confidence: 99%

“…Then, we studied relation between Re number and Nu number. As shown in equation (7), Re number requires characteristic flow velocity. However, it was not possible to estimate the velocity by commonly used measurements, so we utilized waveforms of the heat flux.…”

Section: Heat Transfer Correlations At Different Impingement Distancementioning

confidence: 99%

“…Similarly, it was shown that the local heat flux value reached a peak at a certain spray impingement distance to the wall. 7…”

Section: Introductionmentioning

confidence: 99%

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Effects of injection pressure and impingement distance on flat-wall impinging spray flame and its heat flux under diesel engine-like condition

Mahmud

Kurisu

Nishida

et al. 2019

Advances in Mechanical Engineering

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Heat loss is one of the main causes of energy losses in modern direct injection diesel engines. This heat loss of the engine occurs during combustion, mainly due to the heat transfer between the impinging spray flame and the piston cavity wall. It is of more critical in small size engines. In order to decrease heat transfer, we need to examine the phenomenon of heat transfer through the combustion chamber walls more fully. To achieve this, we investigated the effects of flame impingement on transient heat flux to the wall. By using a constant volume vessel with a fixed impingement wall, the surface heat flux of the wall at the locations of spray flame impingement was measured with three thin film thermocouple heat flux sensors. The combined effect of impingement distance and injection pressure on the heat transfer was investigated parametrically. The results showed that an increase of injection pressure with longer impinging distance led to an increase in the heat transfer coefficient, which had a dominant effect on local heat flux compared with local temperature distribution. Moreover, we confirmed that the relation between Nusselt number and Reynolds number is a useful measure for describing the heat transfer phenomena in diesel combustion.

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Section: Introductionmentioning

confidence: 77%

Section: Experimental Apparatus and Methodsmentioning

confidence: 99%

Section: Heat Transfer Correlations At Different Impingement Distancementioning

confidence: 99%

“…Similarly, it was shown that the local heat flux value reached a peak at a certain spray impingement distance to the wall. 7…”

Section: Introductionmentioning

confidence: 99%

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Effects of injection pressure and impingement distance on flat-wall impinging spray flame and its heat flux under diesel engine-like condition

Mahmud

Kurisu

Nishida

et al. 2019

Advances in Mechanical Engineering

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Experimental investigation of a post-combustion pool fire phenomenon due to the spray-wall interaction under DI engine-like cold-start conditions

Zhang

et al. 2023

Energy

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Characteristics of Flat-Wall Impinging Spray Flame and Its Heat Transfer under Diesel Engine-Like Condition: Effects of Injection Pressure, Nozzle Hole Diameter and Impingement Distance

Mahmud¹,

Kurisu²,

Akgol³

et al. 2019

SAE Int. J. Adv. & Curr. Prac. in Mobility

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<div class="section abstract"><div class="htmlview paragraph">Substantial amount of fuel energy input is lost by heat transfer through combustion chamber walls in the internal combustion engines. Thus, these heat losses account for reduced thermal efficiency, in that spray-wall impingement plays a crucial role in Direct Injection diesel engines. The objective of this study is to investigate the mechanism of the heat transfer from the spray/flame to the impinging wall under small diesel engine-like condition and how the spray characteristics are affected with regards to effect of injection pressure, nozzle hole diameter and impingement distance. The experiment results showed that injection pressure was predominant factor on spray-wall heat transfer.</div></div>

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Characteristics of Flat-Wall Impinging Spray Flame and Its Heat Transfer under Small Diesel Engine-Like Condition. 3^th Report: Effect of Oxygen Concentration

Cited by 3 publications

References 8 publications

Effects of injection pressure and impingement distance on flat-wall impinging spray flame and its heat flux under diesel engine-like condition

Effects of injection pressure and impingement distance on flat-wall impinging spray flame and its heat flux under diesel engine-like condition

Experimental investigation of a post-combustion pool fire phenomenon due to the spray-wall interaction under DI engine-like cold-start conditions

Characteristics of Flat-Wall Impinging Spray Flame and Its Heat Transfer under Diesel Engine-Like Condition: Effects of Injection Pressure, Nozzle Hole Diameter and Impingement Distance

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Characteristics of Flat-Wall Impinging Spray Flame and Its Heat Transfer under Small Diesel Engine-Like Condition. 3th Report: Effect of Oxygen Concentration

Cited by 3 publications

References 8 publications

Effects of injection pressure and impingement distance on flat-wall impinging spray flame and its heat flux under diesel engine-like condition

Effects of injection pressure and impingement distance on flat-wall impinging spray flame and its heat flux under diesel engine-like condition

Experimental investigation of a post-combustion pool fire phenomenon due to the spray-wall interaction under DI engine-like cold-start conditions

Characteristics of Flat-Wall Impinging Spray Flame and Its Heat Transfer under Diesel Engine-Like Condition: Effects of Injection Pressure, Nozzle Hole Diameter and Impingement Distance

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Characteristics of Flat-Wall Impinging Spray Flame and Its Heat Transfer under Small Diesel Engine-Like Condition. 3^th Report: Effect of Oxygen Concentration