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Numerical investigation on relationship between injection pressure fluctuations and unsteady cavitation processes inside high-pressure diesel nozzle holes

机译：高压柴油机喷孔内喷射压力波动与非定常空化过程关系的数值研究

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The relationship between injection pressure fluctuations and unsteady cavitation processes inside the high-pressure diesel nozzle holes have been numerically analyzed by using a two-fluid approach. In order to improve prediction of nozzle hole cavitation content under high-pressure injection conditions, a new adjustment model of bubble number density has also been developed through the analysis of cavitation bubble dynamics and internal flow characteristics of nozzle hole. Model validation results verify that this model is applicable for a wide range of diesel injection pressures. Based on simulation results, it has been found that cavitation bubbles in recirculation zone and its wake flow show totally different responses to the variations of upstream pressure, and the evolution of cavitation content shows a close association with the time derivatives of upstream pressure.
机译：通过使用双流体方法，数值分析了高压柴油喷嘴孔内喷射压力波动与不稳定气穴过程之间的关系。为了提高对高压注入条件下喷孔空化含量的预测，通过对空化气泡动力学和喷孔内部流动特性的分析，建立了新的气泡数密度调节模型。模型验证结果验证了该模型适用于各种柴油喷射压力。根据模拟结果，发现回流区的空化气泡及其尾流对上游压力的变化表现出完全不同的响应，空化含量的变化与上游压力的时间导数密切相关。

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