On the fuel injection rate profile as boundary conditions for diesel spray combustion simulations
On the fuel injection rate profile as boundary conditions for diesel spray combustion simulations
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将燃油喷射率曲线作为柴油喷雾燃烧模拟的边界条件
DOI：
10.1016/j.fuel.2020.118026
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发表时间：
2020-09
期刊：
影响因子：
7.4
通讯作者：
Ning Wang
中科院分区：
文献类型：
--
作者：
Xinyi Zhou;Tie Li;Ping Yi;Zhifei Zhang;Ning Wang
喷油起始过渡过程的计算流体动力学（CFD）模拟柴油喷雾燃烧提出了挑战。在以往的研究中，通常是对实验的不确定性或数值方法，如网格大小的选择和子模型比较。到目前为止，很少有研究试图修改燃油喷射率（FIR）的轮廓作为燃料输入的边界条件的数值模型。本文考虑到Bosch长管法与实际喷油过程中喷咀内流动的差异，分别建立了“速度修正”和“质量修正”的FIR型线，使喷油速度和喷油质量与实际喷油过程一致。在简要介绍了实验方法和数值方法后，分别在非反应和燃烧条件下对实验数据进行了验证，验证了新开发的两种FIR剖面以及未修正的和发动机燃烧网络（ECN）FIR剖面作为CFD模拟边界条件的有效性。与未修正的FIR轮廓的模拟显示出显着较低的喷雾和火焰穿透在喷射的初始阶段，而与新开发的两个FIR轮廓的模拟表现出几乎相同的喷雾和火焰穿透与实验数据。ECN FIR轮廓模拟的精度介于上述两种情况之间。这些结果对于研究人员评估柴油机喷雾燃烧模拟的潜在缺陷是来自边界条件的变化还是来自程序本身具有参考价值。
The start of injection (SOI) transition processes present challenges for diesel spray combustion simulations by computational fluid dynamics (CFD). In the previous studies, claims are usually placed on the experimental uncertainties or numerical methods such as grid size selection and sub-model comparison. Until now, few studies have been attempted to revise the fuel injection rate (FIR) profile used as the fuel input boundary condition for numerical models. It this paper, considering the difference of in-nozzle flow between the Bosch long-tube method and actual injection, the ''Velocity Revised'' and ''Mass Revised'' FIR profiles are formulated to keep the fuel injection velocity and fuel injection mass consistent with the actual injection, respectively. After a brief description of the experimental and numerical methods, the effectiveness of the newly developed two FIR profiles and the uncorrected and the Engine Combustion Network (ECN) FIR profiles used as boundary conditions for CFD simulation is validated against the experimental data under both the non-reacting and burning conditions. The simulations with the uncorrected FIR profile show remarkably lower spray and flame penetrations at the initial stage of injection, while the simulations with the newly developed two FIR profiles exhibit almost identical spray and flame penetrations with the experimental data. The accuracy of the ECN FIR profile simulation is between the above two cases. These results are believed to be valuable reference for researchers to evaluate whether the potential shortcoming in diesel spray combustion simulations is from the variation in boundary condition or the code itself.
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影响因子：
1.6
作者：
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通讯作者：
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影响因子：
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作者：
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DOI：
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发表时间：
1999-03
期刊：
SAE transactions
影响因子：
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作者：
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通讯作者：
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DOI：
10.1016/j.ijmultiphaseflow.2015.12.001
发表时间：
2016-07
影响因子：
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作者：
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