A Study on the Heat Loss in Diesel Spray Flame

Tatsumi, Takeshi; Maeda, Shigeyuki; Nakata, Masanori; Matsumura, Eriko; Senda, Jiro

doi:10.1299/jsmekansai.2017.92.m206

Cited by 2 publications

(3 citation statements)

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“…This longer distance leads to an increase in the flame temperature at the time of impingement due to mixing, resulting in a substantial impact on both the local heat flux toward the total heat transferred. Previous studies conducted by [29][30] support this finding, showing an increase in the homogeneous flame temperature with an increase in impingement distance. Simultaneously, the higher injection pressure, which corresponds to a higher velocity, resulted in an increased flow velocity of the flame gas in the outer region.…”

Section: Heat Transfer Analysis At Various Injection Pressures Nozzle...supporting

confidence: 69%

“…It can be seen that at 0.133 mm nozzle hole diameter has lower heat loss. Decreasing the dominant factor contributing to the heat loss at these injection pressures is the flame temperature which is inverse to the nozzle hole diameter [29]. However, at the highest injection pressure of 180 MPa, the 0.133 mm nozzle hole diameter resulted in higher heat loss compared to the 0.122 mm diameter.…”

Section: Heat Transfer Analysis At Various Injection Pressures Nozzle...mentioning

confidence: 93%

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Experimental Investigation of Heat Transfer in a Flat-wall Impinging Diesel Spray Flame under Diesel-like Conditions

Safiullah

Ray

Rohmawati

et al. 2023

JMESI

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The heat loss through the walls of Internal Combustion Engines (ICEs) needs to be minimized and improved since it has a detrimental impact on the overall thermal efficiency of the engine. This study focuses on investigating heat transfer in a flat-wall impinging diesel spray flame, simulating diesel conditions, to optimize engine parameters. The effects of factors such as various injection pressures, nozzle hole diameters, impingement distances, and oxygen concentrations are analysed in combined and individually. Experimental techniques, such as high-speed imaging, heat flux sensors, and thermocouples, are used to visualize spray flame, measure heat flux profiles and temperature distributions, respectively. Preliminary results and their implications on heat transfer and heat loss are discussed. Regarding the parametric studies investigating the effect on wall heat loss under conditions similar to those of a small diesel engine, it was observed that the transferred heat on the wall was significant in certain conditions. These results emphasize the effectiveness of manipulating the injection rate profile as a viable step to suppress the heat transfer through the wall.

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Section: Heat Transfer Analysis At Various Injection Pressures Nozzle...supporting

confidence: 69%

Section: Heat Transfer Analysis At Various Injection Pressures Nozzle...mentioning

confidence: 93%

Experimental Investigation of Heat Transfer in a Flat-wall Impinging Diesel Spray Flame under Diesel-like Conditions

Safiullah

Ray

Rohmawati

et al. 2023

JMESI

View full text Add to dashboard Cite

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“…Several approaches have been considered to reduce cooling losses, including reducing the combustion temperatures by supercharging and exhaust gas recirculation (EGR), wall heat insulation, including wall temperature swing, [1][2][3][4][5][6] and suppressing flow near the wall by split injection. [7][8][9] However, shortening the combustion duration with an appropriate combustion phase and a higher compression ratio are effective in reducing exhaust loss. An effective method to shorten the combustion duration is increasing the diameter of the nozzle holes, number of nozzle holes, and the injection pressure.…”

Section: Introductionmentioning

confidence: 99%

Analysis of the relationship between near-wall velocity distribution and wall heat flux under diesel spray flame impingement in an RCEM

Jo,

Kawai,

Horibe

et al. 2024

International Journal of Engine Research

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To clarify the relationship between the near-wall flow and the heat flux through the wall, the velocity distribution of the diesel spray flame and the heat flux at the combustion chamber wall were measured in a rapid compression and expansion machine (RCEM), which has a twodimensional combustion chamber. The velocity distribution of the diesel spray flame near the wall was measured by the particle image velocimetry (PIV), and the heat flux through the wall where the diesel spray flame impinges was measured using a newly developed multi-point heat flux sensor. Furthermore, the velocity gradient tensor was calculated based on the measured velocity distribution results, and the effect of the shear flow characteristics on wall heat transfer was analyzed. As a result, the higher the injection pressure leads the higher the peak value of the heat flux. A fluctuation of the heat flux exhibits the same trend as the fluctuations of the velocity, and a high heat flux appeared in the high-velocity gradient tensor region, which suggests that the characteristics of shear flow near the wall can affect the heat flux.

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A Study on the Heat Loss in Diesel Spray Flame

Cited by 2 publications

References 0 publications

Experimental Investigation of Heat Transfer in a Flat-wall Impinging Diesel Spray Flame under Diesel-like Conditions

Experimental Investigation of Heat Transfer in a Flat-wall Impinging Diesel Spray Flame under Diesel-like Conditions

Analysis of the relationship between near-wall velocity distribution and wall heat flux under diesel spray flame impingement in an RCEM

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