Abstract Steam is a common medium in thermal engineering. When it flows through a throttling element, the aerodynamic noise may occur due to the disturbance. In this investigation, superheated steam flowing through a Venturi tube, one of the main parts in a temperature and pressure regulation valve, at different thermal conditions is studied to analyze to effects of heat transfer on the acoustic power. With a high temperature and a low pressure, the superheated steam is treated as ideal gas. The flow velocity is high, so the k-epsilon turbulent model is used, with the compressible steam. The results show that under the adiabatic condition, the acoustic power mainly influenced by the turbulent characteristics, such as the dissipation rate and the turbulent kinetic energy. Comparing the acoustic power levels at different thermal conditions, it is found that a lower temperature results to a lower acoustic power.

中文翻译：

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过热蒸汽流过温度和压力调节阀的传热效应和气动降噪数值研究

摘要 蒸汽是热工工程中常用的介质。当它流经节流元件时，可能会因扰动而产生气动噪声。在这项研究中，研究了在不同热条件下流经文丘里管的过热蒸汽，文丘里管是温度和压力调节阀的主要部件之一，以分析传热对声功率的影响。过热蒸汽具有高温和低压，被视为理想气体。流速很高，因此使用 k-epsilon 湍流模型，可压缩蒸汽。结果表明，在绝热条件下，声功率主要受湍流特性的影响，如耗散率和湍流动能。比较不同热条件下的声功率水平，