Abstract The paper investigates the flow noises caused by the high temperature liquid Sodium in the nuclear main pump system. Three-dimensional unsteady CFD coupled sound field methods are exploited. Spectrum characteristics of sound source load are obtained. Directional sound pressure level distribution based on sound source load of rotor blades and guide vanes are presented and discussed. Distribution of sound pressure level of inlet and outlet pipes along the flow direction are also further discussed. Results indicate that with the increase of blade passing frequency, the amplitude of sound pressure level decreases. Response of sound field mainly depends on the load characteristics of rotor blades. Research results have remarkable significances for the analysis of flow noises in liquid Sodium pump systems.

中文翻译：

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二回路主回路液钠泵系统中高温液钠引起核主泵流动噪声分析

摘要 研究了核主泵系统中高温液态钠引起的流动噪声。三维非定常 CFD 耦合声场方法被利用。获得声源负载的频谱特性。提出并讨论了基于转子叶片和导叶声源载荷的定向声压级分布。还进一步讨论了入口和出口管道沿流动方向的声压级分布。结果表明，随着叶片通过频率的增加，声压级的幅值减小。声场的响应主要取决于转子叶片的载荷特性。研究成果对液钠泵系统的流动噪声分析具有重要意义。