流热耦合效应下核主泵非均布-仿生导叶提性降噪机理分析及适配设计研究

核主泵导叶是连接圆周对称的叶轮出口、非圆周对称的压水室进口的关键部件，必须适应核主泵通流部件非完全圆周对称的结构特点，而无论是最先进的美国AP1000核主泵还是中国CAP1400核主泵，对此考虑不足，都采用了叶片均布的导叶结构，由此引发的水力激振和非稳流动给核主泵安全运行带来极大隐患，亟待开展考虑真实流热效应的新型导叶适配设计研究。本项目拟融合提性的非均布设计理念、降噪的仿生叶型思想，结合核岛非稳态流热计算方法、智能算法开展新型非均布-仿生导叶提性降噪机理分析和优化研究，具体包括：建立一种考虑真实高温高压、高效精确的核主泵水力性能多尺度流热耦合计算分析方法；构建一套导叶叶片结构和布局可调的约束性设计体系，实现包含常规、新型结构在内的多设计方案归一化表征；揭示部件参数分布对水力性能的作用机理，探究形性协同影响规律，建立非均布-仿生导叶适配优化设计平台，以获得提性降噪的最优方案。

The nuclear main pump’s guide vane is the core component to connect the outlet of the circumferentially symmetrical impeller and the inlet of the non-circumferentially symmetrical case, which must be adapted to the structural characteristics of the whole non-circumferentially symmetrical flow-through components. Nevertheless, aiming at the most advanced AP1000 nuclear main pump of America and the CAP1400 nuclear main pump of China, they both take the insufficient consideration in this regard, and just adopt the traditional guide vane structure with uniform blades, which would cause the existence of hydraulic vibration and unsteady flow, and threaten the safety operation of the nuclear main pump. As a result, the study about the adaptive design of the new guide vane with the consideration of the actual fluid-thermal coupling effect is urgent. In this project, the non-uniform design concept to improve the performances and the bionic blade design idea to reduce the noise would be integrated. And then, based on the advanced fluid-thermal coupling calculation method and intelligent algorithm, mechanism analysis and optimal design of the nuclear main pump’s non-uniform bionic guide vane for noise reduction and performance improvement would be executed, the details are as: considering the real high temperature and high pressure environment, an efficient and accurate multi-scale fluid-thermal coupling calculation and analysis method is established; a kind of constraint design approach with adjustable blades’ structure and layout would be proposed, which can realize the normalized representation of multiple design schemes comprised of the conventional and new structures; the mechanism between the distributing design variables and the hydraulic performances would be revealed, and then the synergistic influence law of shape on the performances would be explored, as a result, a nonuniform-bionic guide vane’s adaptation optimization design platform is established, which can obtain the optimal design result with the improved performance and the reduced noise.