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首页> 外文会议>Proceedings of the 2009 spring technical conference of the ASME Internal Combustion Engine Division >A NUMERICAL INVESTIGATION OF TRANSIENT FLOW AND CAVITATION WITHIN MINISAC AND VCO DIESEL INJECTOR NOZZLES
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A NUMERICAL INVESTIGATION OF TRANSIENT FLOW AND CAVITATION WITHIN MINISAC AND VCO DIESEL INJECTOR NOZZLES

机译：最小和VCO柴油喷油嘴内瞬态流动和空化的数值研究

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摘要

Cavitating flow within diesel injector passages has been investigated numerically using the Homogeneous Equilibrium Model (HEM), which uses the barotropic assumption and the variable speed of sound of the mixture. To apply the HEM, the KIVA-3V code was modified to implement a generalized equation of state, and injector needle movement is simulated by the Arbitrary Lagrangian-Eulerian (ALE) approach and the snapper algorithm. It is demonstrated that the model can predict the effect of nozzle passage geometry on the flow structure and cavitation. The model is able to reproduce the transient fuel injection rate as a function of the needle lift profile. Special interest is focused on the transient behavior during the nozzle closing period, which shows that the fast decrease in flow rate can increase the cavitation in the nozzle passage. The effects of the pressure difference and environment pressure on cavitation augmentation at the end of the injection were also investigated. Flow characteristics due to different shapes of the nozzle flow passage in axisymmetric single hole nozzles and multi hole nozzle configurations (mini-sac and VCO eight-hole nozzles) were compared with emphasis on the end of injection period.
机译：柴油喷射器通道内的空化流已使用均质平衡模型（HEM）进行了数值研究，该模型使用正压假设和混合物的可变声速。为了应用HEM，对KIVA-3V代码进行了修改，以实现广义状态方程，并通过任意Lagrangian-Eulerian（ALE）方法和捕捉器算法来模拟喷油器针头运动。结果表明，该模型可以预测喷嘴通道几何形状对流动结构和空化的影响。该模型能够根据阀针升程曲线再现瞬态燃油喷射率。特别关注的是喷嘴关闭期间的瞬态行为，这表明流量的快速下降会增加喷嘴通道中的气穴现象。还研究了压差和环境压力对注射结束时气穴增强的影响。比较了在轴对称单孔喷嘴和多孔喷嘴配置（微型囊和VCO八孔喷嘴）中由于喷嘴流动通道形状不同而引起的流动特性，重点是在注入周期结束时。

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