高温水中具有热力学抑制效应的空化流温度降低模型
Temperature depression model for cavitating flow with thermodynamic suppression effect in high-temperature water
AI总结：
针对高温水空化流的热力学抑制效应，本文在Fruman模型基础上引入蒸发质量通量抑制效应，建立了温度降低模型，并在高达140°C的实验数据中验证了其高温区域再现能力。
摘要：
空化的热力学抑制效应通常出现在低温空化流中。温度降低，即主流与空腔内部的温差，指示了热力学抑制效应。本研究建立了一个温度降低模型，以理解热力学抑制效应的物理过程。该模型利用高达140 $^\circ$C的高温水中超空化内部温度的实验数据进行了评估。温度降低模型基于Fruman模型推导，并新引入了蒸发质量通量的抑制效应。首先，将Fruman模型与实验数据进行了比较。Fruman模型在超过100 $^\circ$C的高温区域与实验数据存在差异。相比之下，所提出的模型在高温区域很好地再现了实验数据。因此，引入蒸发质量通量的抑制效应对于描述空化流中的温度降低至关重要。此外，所提出的模型用现有参数表达，并明确了温度降低由B因子特征温度、努塞尔数以及一个由无量纲热力学参数表示的蒸发质量通量抑制效应项所定义。
英文摘要：
The thermodynamic suppression effect of cavitation generally appears in cryogenic cavitating flows. Temperature depression, which is the temperature difference between the mainstream and inside the cavity, indicates the thermodynamic suppression effect. In this study, a temperature depression model is developed to understand the physical process of the thermodynamic suppression effect. The model is evaluated using the experimental data of temperature inside supercavitation in high-temperature water of up to 140 $^\circ$C. The temperature depression model is derived based on Fruman's model and newly introducing the suppression effect of evaporative mass flux. At first, Fruman's model was compared with the experimental data. Fruman's model differed from the experimental data in the high-temperature region of more than 100 $^\circ$C. In contrast, the proposed model reproduced the experimental data well in the high-temperature region. Therefore, introducing a suppression effect of evaporative mass flux is essential for describing the temperature depression in cavitating flow. In addition, the proposed model was expressed with existing parameters, and it was clear that the temperature depression was defined with the characteristic temperature of the B factor, the Nusselt number, and a term representing the suppression effect of evaporative mass flux expressed by dimensionless thermodynamic parameters.
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