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首页> 外文期刊>Combustion Science and Technology >DIESEL ENGINE SIMULATIONS WITH MULTI-DIMENSIONAL CONDITIONAL MOMENT CLOSURE
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DIESEL ENGINE SIMULATIONS WITH MULTI-DIMENSIONAL CONDITIONAL MOMENT CLOSURE

机译：多维条件矩闭合的柴油机模拟

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摘要

First-order elliptic Conditional Moment Closure (CMC), coupled with a computational fluid dynamics (CFD) solver, has been employed to simulate combustion in a direct-injection heavy-duty diesel engine. The three-dimensional structured finite difference CMC grid has been interfaced to an unstructured finite volume CFD mesh typical of engine modelling. The implementation of a moving CMC grid to reflect the changes in the domain due to the compression and expansion phases has been achieved using an algorithm for the cell addition/removal and modelling the additional convection term due to the CMC cell movement. Special care has been taken for the boundary conditions and the wall heat transfer. An operator splitting formulation has been used to integrate the CMC equations efficiently. A CMC domain reduction of the three-dimensional problem to two- and zero-dimensions through appropriate volume integration of the CMC equation has been explored in terms of accuracy and computational time. Additional considerations have been reported concerning the initialization of the CMC domain in conserved scalar space during transient calculations where the probability density function of the mixture fraction changes drastically with time as during fuel injection. Predictions compare favourably with the experimental pressure traces for tests at full and half load. A balance of terms in the CMC equation allows conjectures on the structure of the flame and its expansion across the spray after autoignition.
机译：一阶椭圆条件矩闭环（CMC）与计算流体力学（CFD）求解器结合在一起，已被用来模拟直喷重型柴油机的燃烧。三维结构化有限差分CMC网格已与典型的发动机建模非结构化有限体积CFD网格连接。已经使用用于细胞添加/去除的算法以及由于CMC细胞移动而对附加对流项进行建模的算法，实现了移动CMC网格的实现以反映由于压缩和扩展阶段导致的域变化。对于边界条件和壁的热传递已经特别注意。运算符拆分公式已用于有效集成CMC方程。通过对CMC方程进行适当的体积积分，已研究了将三维问题的CMC域简化为二维和零维问题的准确性和计算时间。对于瞬态计算过程中守恒标量空间中CMC域的初始化，还存在其他考虑因素的报告，在瞬态计算过程中，混合分数的概率密度函数会随着时间的推移而急剧变化，就像在燃料喷射过程中一样。对于全负载和半负载下的测试，预测结果与实验压力曲线相比具有优势。 CMC方程中的项平衡允许对火焰的结构以及自燃后火焰在整个喷雾中的膨胀进行推测。

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