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Algorithms for improving accuracy of spray simulation
Authors:HuiYa Zhang  YuSheng Zhang  HeLin Xiao  Bo Xu
Affiliation:(1) Faculty of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan, 430074, China
Abstract:Fuel spray is the pivotal process of direct injection engine combustion. The accuracy of spray simulation determines the reliability of combustion calculation. However, the traditional techniques of spray simulation in KIVA and commercial CFD codes are very susceptible to grid resolution. As a consequence, predicted engine performance and emission can depend on the computational mesh. The two main causes of this problem are the droplet collision algorithm and coupling between gas and liquid phases. In order to improve the accuracy of spray simulation, the original KIVA code is modified using the cross mesh droplet collision (CMC) algorithm and gas phase velocity interpolation algorithm. In the constant volume apparatus and D.I. diesel engine, the improvements of the modified KIVA code in spray simulation accuracy are checked from spray structure, predicted average drop size and spray tip penetration, respectively. The results show a dramatic decrease in grid dependency. With these changes, the distorted phenomenon of spray structure is vanished. The uncertainty in predicted average drop size is reduced from 30 to 5 μm in constant volume apparatus calculation, and the uncertainty is further reduced to 2 μm in an engine simulation. The predicted spray tip penetrations in engine simulation also have better consistency in medium and fine meshes. Supported by the National Basic Research Program of China (Grant No. 2001CB209207) and the National Natural Science Foundation of China (Grant No. 50676036)
Keywords:droplet collision algorithm  coupling between gas and liquid phases  accuracy of spray simulation  spray structure  average drop size   spray tip penetration
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