Three-Dimensional Simulation of Heat Transfer in Diesel-Spray Flame Impinging on Flat Wall using Skeletal Mechanism of n-Tridecane

Hori, Tsukasa; Fujiwara, Kimiko; Tsubokura, Makoto; Kuwahara, Keisuke; Matsumura, Eriko; Senda, Jiro

doi:10.1299/jmsesdm.2017.9.b107

Cited by 3 publications

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“…的に計算し，圧縮性の支配方程式で流体を計算する (Amsden et al, 1989) ．定常燃焼器の燃焼シミュレーションと異なり，間欠燃焼の内燃機関では燃料の反応機構を用いて，ディーゼルエンジンの自着火やガソリンエンジンのノッキングなどの非定常挙動を予測する必要がある．よって，計算セル毎に常微分方程式(ODE)を計算して反応による化学種変化を計算し，簡略化反応機構で用いる化学種数の化学種保存式を解くため (Kong et al, 2001) (Kohashi et al, 2003) ，反応計算が計算時間の大部分を占める．計算時間は格子数や考慮する化学種数に比例して増加することから，計算精度改善を目的として考慮する化学種や格子数を増加させることが困難であった． E-mail of corresponding author: thori@mech.eng.osaka-u.ac.jp このような中で，近年の計算機性能と並列計算技術の発展に伴い計算効率が向上し，格子数増加に伴う空間解像度の向上によって，燃料噴霧や燃焼の予測が改善されると報告されている (Senecal et al, 2007) (Senecal et al, 2012) (Raju et al, 2012) ．著者らも簡略化反応機構の開発 (Kuwahara et al, 2016)に加えて，大規模並列計算，高速 ODE ソルバ (Perini et al, 2012) ，解適合格子により計算時間短縮を達成し，格子数増加による計算精度改善を試みている (Hori et al, 2017) ．しかし，数千万から数億程度の格子数を用いた内燃機関の燃焼シミュレーションを想定すると計算高速化が十分でなく，反応機構の計算負荷は依然問題である．計算時間の更なる削減のため，詳細反応機構を用いて事前に作成した参照表を活用して ODE の計算を省略する Flamelet モデル (Bekdemir et al, 2011) ，計算セルを領域分けし，領域の代表値を用いた ODE の結果を各セルに補間して燃焼による化学種変化を計算する Multi-Zone モデル (Aceves et al, 2000) (Babajimopoulos et al, 2005) (Raju et al, 2012)…”

Section: 内燃機関の燃焼シミュレーションの場合，Ddm(discrete Droplet Model)で燃料液滴の挙動をラグランジアンunclassified

Conserved scalar and progress variable for internal combustion engine simulation with chemical kinetics

Hori

2018

Transactions of the JSME (In Japanese)

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The conserved scalar and progress variable have been modified and proposed for spray and engine combustion simulation with chemical kinetics. The global equivalence ratio (GER) and progress equivalence ratio (PER) were proposed as the conserved scalar and progress variable in multi-zone model for engine simulations with chemical kinetics . The combination of GER and PER work in lean mixture without EGR gas. But these would not work under rich mixture or EGR gas conditions. Thus, the modified GER is proposed to apply the EGR gas conditions where CO2 and H2O mix in air. Furthermore, the progress variable based on the chemical energy also proposed with modified GER. The zero-dimensional combustion simulations are done under constant pressure and adiabatic conditions to validate the proposed indexes. The reaction mechanism is the detailed chemistry of n-dodecane. That consists of 1,255 chemical species and 3,075 reactions. The results show that the conventional GER works in any mixture as conserved scalar and is good agreement with equivalence ratio under the ambient gas of air. But, the conventional GER overestimates equivalence ratio in lean mixture and underestimates equivalence ratio in rich mixtures. The modified GER is good agreement with equivalence ratio under the ambient gas of air and EGR gas including CO2 and H2O, regardless of lean and rich mixtures. The results also indicate that the PER works in lean mixtures. But that do not work in stoichiometric and rich mixture. The progress variable based on the mass fraction of some chemical species (Van Oijen and De Goey, 2010) works in any mixture, but the that can not compare the reaction progress between different GER conditions. The proposed progress variable works in any mixture and compares the reaction progress at different GER conditions quantitatively.

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Section: 内燃機関の燃焼シミュレーションの場合，Ddm(discrete Droplet Model)で燃料液滴の挙動をラグランジアンunclassified

Conserved scalar and progress variable for internal combustion engine simulation with chemical kinetics

Hori

2018

Transactions of the JSME (In Japanese)

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“…Considerable progress has been made on numerical simulation and modelling of two-phase flows over the decades, from the earlier studies by Bray and co-workers [19][20][21] to the more recent ones [e.g., 22 , [23][24][25][26][27][28][29][30][31][32][33][34][35][36][37] , 38] . Modelling and simulation of spray combustion under Diesel engine-like conditions have also been performed [e.g., 39 , [40][41][42][43][44][45][46] , 47] . For premixed flames impinging on walls and interacting with walls, there exist some early theoretical [e.g., 4 8 , 4 9 , 50] and experimental [e.g., 51 , 52 , 53] studies by Bray and co-workers, and several numerical investigations by other researchers [e.g., 54 , [55][56][57][58] , 59] .…”

Section: Introductionmentioning

confidence: 99%

“…Furthermore, the simulation of a spray flame impinging on a wall adds another level of complexity (due to fuel droplets impacting on the wall surface and forming a liquid film on it, and flame-wall interaction), is difficult to model and is demanding in terms of computational resources. Hence, studies involving numerical simulations of spray flames impinging on walls are scarce to the best of the authors' knowledge, with one example being that of Hori et al [45] . In their study, Hori et al [45] numerically analysed Diesel spray flames impinging on a flat wall using Reynolds Averaged Navier-Stokes (RANS) simulations, to investigate the relationship between fuel injection pressure and wall heat loss.…”

Section: Introductionmentioning

confidence: 99%

Numerical analysis of heat transfer characteristics of spray flames impinging on a wall under CI engine-like conditions

Pillai

Kai

Murata

et al. 2022

Combustion and Flame

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“…The details of the process and its mechanism remain unclear and relevant engine heat transfer models are under development. 2,[10][11][12][13][14][15] In many of previous experimental investigations targeting elucidation of engine heat transfer, varieties of point-measurement heat flux sensors have been utilized. 9,[16][17][18][19][20] These sensors feature fast response, high accuracy, compactness and ruggedness.…”

Section: Introductionmentioning

confidence: 99%

“…The details of the process and its mechanism remain unclear and relevant engine heat transfer models are under development. 2,10–15…”

Section: Introductionmentioning

confidence: 99%

Infrared high-speed thermography of combustion chamber wall impinged by diesel spray flame

Aizawa

Kinoshita

Akiyama

et al. 2021

International Journal of Engine Research

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As a demonstration of a new method to examine the extremely unsteady and spatially varying wall heat transfer phenomena on diesel engine combustion chamber wall, high-speed imaging of infrared thermal radiation from the wall surface impinged by a diesel spray flame was attempted using a high-speed infrared camera. A 35 mm-diameter chromium-coated quartz window surface was impinged by a diesel spray flame with an impinging distance of 27 mm from the nozzle orifice in a constant volume combustion chamber. The infrared thermal radiation from the back surface of the 0.6 µm thick chromium layer was successfully visualized at 10 kHz frame rate and 128 × 128 pixel resolution through the quartz window. The infrared radiation exhibited coherent and streaky structure with radial stripes extending and waving from the stagnation point. The width of the radial stripes, spatial amplitude and the period of the waving movement were comparable to the ones for turbulent heat transfer on the engine cylinder wall previously measured with a heat flux sensor, suggesting that they are resulting from the turbulent structure in the wall-impinging diesel flame. The radiation intensity was calibrated to temperature and converted to heat flux via 3-D numerical analysis of transient thermal conduction in the quartz window. The peak-to-peak variation amplitudes of temperature and heat flux among the radial stripes during the diesel spray flame impingement were about 20 K and 2.3 MW/m2, corresponding to 13% of 150 K maximum temperature swing amplitude and 18 MW/m2 maximum heat flux, respectively.

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Three-Dimensional Simulation of Heat Transfer in Diesel-Spray Flame Impinging on Flat Wall using Skeletal Mechanism of n-Tridecane

Cited by 3 publications

References 0 publications

Conserved scalar and progress variable for internal combustion engine simulation with chemical kinetics

Conserved scalar and progress variable for internal combustion engine simulation with chemical kinetics

Numerical analysis of heat transfer characteristics of spray flames impinging on a wall under CI engine-like conditions

Infrared high-speed thermography of combustion chamber wall impinged by diesel spray flame

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