Large-eddy simulation analysis of the influence of the needle lift on the cavitation in diesel injector nozzles
Large-eddy simulation analysis of the influence of the needle lift on the cavitation in diesel injector nozzles
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DOI：
10.1177/0954407014542627
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发表时间：
2015-03
期刊：
影响因子：
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通讯作者：
J. Desantes;F. J. Salvador;M. Carreres;J. Martínez-López
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文献类型：
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作者：
J. Desantes;F. J. Salvador;M. Carreres;J. Martínez-López
柴油机喷油器喷嘴内的空化现象对喷嘴内的流动和喷雾发展有很大的影响。尽管其重要性，但仍有许多方面尚不清楚，特别是对于当喷射器处于打开和关闭阶段时的部分针升程。因此，本文着重研究针阀升程对柴油机喷嘴内部流动的影响。本研究进行了三维模拟在高注射压力（160 MPa）使用均相平衡模型在OpenFOAM中实现的空化现象建模。采用大涡模拟方法对六种不同针阀升程下的喷管进行了数值模拟（10 μm、30 μm、50 μm、75 μm、100 μm和250 μm），提供了有关内部流动演变、湍流发展（涡量、涡激-空化相互作用和湍流结构）与喷嘴出口流动特性的关系（质量流量、动量通量和有效速度）与针头位置的关系。
The cavitation phenomenon has a strong influence on the internal flow and spray development in diesel injector nozzles. Despite its importance, there are many aspects which still remain unclear, especially for partial needle lifts when the injector is in the opening and closing phases. For that reason, the current paper is focused on the influence of the needle lift on the internal flow in a diesel nozzle. This study was carried out with three-dimensional simulations at a high injection pressure (160 MPa) using a homogeneous equilibrium model implemented in OpenFOAM to model the cavitation phenomenon. The nozzle was simulated with large-eddy simulation methods at six different needle lifts (10 μm, 30 μm, 50 μm, 75 μm, 100 μm and 250 μm), providing relevant information about the evolution of the internal flow, the turbulence development (the vorticity, the turbulence–cavitation interaction and the turbulent structures) and the flow characteristics in the nozzle outlet (the mass flow, the momentum flux and the effective velocity) with the needle position.