Abstract Modern internal combustion engines rely on a high pressure fuel injection system to deliver the fuel inside the engine. This high pressure fuel injection also results in additional complexities, one of which is the cavitation occurring due to large pressure drops inside the injector. The generation of cavitation pockets inside the injector is known to increase the turbulence locally, affecting the external jet formation. To capture this effect, a specific procedure is needed to study the effect of in-nozzle cavitation on the external jet. In this study, we propose and validate a method to study cavitation as well as the external jet formation using a consistent numerical framework based on interface capturing techniques. This formalism allows the representation of three phases : liquid, air and vapor. Numerical simulations of a cavitating liquid jet for two types of cavitation regimes are presented, namely developing cavitation and super cavitation. Numerical results are compared quantitatively, with the existing experimental measurements from the literature of the velocity field inside the injector, and qualitatively, by comparing the liquid and vapor structures obtained in the experiment and the simulation.

中文翻译：

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不凝气注液空化数值模拟

摘要 现代内燃机依靠高压燃油喷射系统将燃料输送到发动机内部。这种高压燃料喷射还导致额外的复杂性，其中之一是由于喷射器内的压降大而导致的气穴现象。众所周知，喷射器内部产生的气穴会增加局部湍流，影响外部射流的形成。为了捕捉这种影响，需要一个特定的程序来研究喷嘴内空化对外部射流的影响。在这项研究中，我们提出并验证了一种使用基于界面捕获技术的一致数值框架来研究空化和外部射流形成的方法。这种形式允许表示三个阶段：液体、空气和蒸汽。给出了两种空化状态的空化液体射流的数值模拟，即发展空化和超空化。通过比较实验和模拟中获得的液体和蒸汽结构，将数值结果与现有文献中关于喷射器内部速度场的实验测量进行定量比较，并进行定性比较。