Simulating Spray Dynamics with a Finite Element Method for Internal Combustion Engines using Large Eddy Simulations

IF 1.3 Q3 THERMODYNAMICS
David Carrington, Jiajia Waters
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Abstract

Spray dynamics in an internal combustion engine is comprised of complex phenomena while interacting with unsteady turbulence. The physics requires detailed modeling of the dynamics for spray and carrier gases to accurately predict a spray’s fate. Large Eddy Simulation (LES) turbulence modeling approaches are capable predictors of the turbulent processes and are capable of dynamically modeling sub-grid scales, therefore enabling calculation of model coefficients for the smallest resolved scale. Dynamic LES methods are also well suited for unsteady flows associated with spray injection and engine fluid dynamics. In this study, for the first time, a dynamic Verman LES scheme employed, in a stabilized a finite element framework, is used to model the spray process with emphasis on injected fuels for simulating internal combustion engines. Spray modeling often comprises a coupled Eulerian-Lagrangian approach to capture the droplet/particle dynamics, where the droplets are modeled in the Lagrangian frame. The momentum and heat exchange between the fluid gases and the evaporating and atomizing spray droplets are modeled in a two-way coupling system as described in this paper. Direct injected liquid is modeled in this paper as a spherical ligament of fuel and ligament break-up to atomization use our version of the Kelvin Helmholtz break-up scheme. Discussed are models and methods of the whole system in some detail, the method for simulation of the fluid’s momentum, heat transfer and turbulence are discussed as is the system to evaluate droplet or ligament properties. Validation or results of the modeling are presented on test cases as determined by Engine Combustion Network (E
基于大涡模拟的内燃机喷雾动力学有限元模拟
内燃机内的喷雾动力学是由复杂的现象组成的,并与非定常湍流相互作用。物理学要求对喷雾和载气的动力学进行详细的建模,以准确地预测喷雾的命运。大涡模拟(LES)湍流建模方法能够预测湍流过程,并且能够动态模拟子网格尺度,因此能够计算最小分辨率尺度的模型系数。动态LES方法也非常适合于与喷射和发动机流体动力学相关的非定常流动。在本研究中,首次在稳定的有限元框架中采用动态Verman LES格式来模拟喷射过程,重点是喷射燃料,以模拟内燃机。喷雾建模通常包括耦合欧拉-拉格朗日方法来捕捉液滴/粒子动力学,其中液滴在拉格朗日框架中建模。本文将流体气体与蒸发和雾化喷雾液滴之间的动量和热交换建模为双向耦合系统。本文将直接注入液体建模为燃料的球形韧带,并使用我们版本的开尔文-亥姆霍兹破裂方案将韧带破裂为雾化。详细讨论了整个系统的模型和方法,讨论了流体动量、传热和湍流的模拟方法,以及液滴或韧带性质的评估系统。通过发动机燃烧网络(E . net)确定的测试案例,给出了模型的验证或结果
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来源期刊
CiteScore
2.70
自引率
6.70%
发文量
36
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