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首页> 外文期刊>International journal of nonlinear sciences and numerical simulation >Boiling Shocks and Self-Oscillations in Critical Nozzle Flow
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Boiling Shocks and Self-Oscillations in Critical Nozzle Flow

机译：临界喷嘴流中的沸腾冲击和自激振荡

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Experiments on the depressurization of highpressure vessels have shown the vaporization to occur in 'boiling shocks' moving with the velocity of ～10 m s~(-1). This phenomenon was explained by proposing a boiling liquid model accounting for bubble fragmentation. It was shown that an explosive boiling-up was caused by a sharp increase in the interphase area due to a chain process of bubble breakup. In the present study, we use this model, with no change in its free parameters, to simulate the flow in a Laval nozzle. In a critical nozzle flow, boiling occurs to proceed in a shock-type wave as well. It is shown that the formation of boiling shocks may cause autovibrations. The investigation of the shock structure shows that the fulfillment of two conditions is necessary for its realization: Weber number must reach its critical value and the flow velocity must be less than an equilibrium speed of sound. When the conditions cannot be simultaneously realized at a steady-state regime, the flow goes over into a self-oscillation mode.
机译：高压容器降压实验表明，汽化发生在“沸腾冲击”中，运动速度约为10 m s〜（-1）。通过提出一种解释气泡破裂的沸腾液体模型来解释这种现象。结果表明，爆炸性沸腾是由于气泡破裂的链状过程使相间面积急剧增加而引起的。在本研究中，我们使用此模型，在自由参数不变的情况下，模拟拉瓦尔喷嘴中的流量。在临界喷嘴流中，沸腾也会以冲击波的形式发生。结果表明，沸腾冲击的形成可能引起自振。对冲击结构的研究表明，要实现它，必须满足两个条件：韦伯数必须达到其临界值，并且流速必须小于声音的平衡速度。当无法在稳态状态下同时实现条件时，流程将进入自激振荡模式。

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