来流含气对高速诱导轮内空化发生发展规律的影响

Multi-phases cavitation is a vital factor to affect the normal operation of high-speed centrifugal pump, which transmits medium with gas component. As an important component to improve anti-cavitation performance of a high-speed centrifugal pump, the anti-cavtitation performance of an inducer is significant. At present, most researches are focused on cavitation phenomena containing vapor and liquid. However, some research observed that increasing of gas content in the suction of the inducer will worsen the cavitation performance rapidly. Under this condition, it involves multi-phases cavitating flow containing gas, vapor and liquid, while the research is still at the infant stage, especially for the mechanism of cavitation evolution in high-speed inducer under gas-liquid two-phase flow conditions.. In this project, the generation and evaluation mechanism of the cavitating flow in high-speed inducer under gas-liquid two-phase flow conditions is investigated based on the methods of theoretical analysis, experimental methods and numerical simulation. The purpose of the project is as bellow. Firstly, a suitable transport equation model for cavitating flow containing gas, vapor and liquid will be developed to simulate the cavitating flow in the inducer. Secondly, turbulent structure in the inducer under interaction between non-condensable gas and cavitation bubble will be revealed. Thirdly, the performance and stable operation range of the cavitating inducer will be ascertained under gas-liquid two-phase flow conditions. This will provide theoretical support for the optimal design and application of a high performance inducer.

高速离心泵输送含气介质面临的多相空化问题是影响泵正常运行的关键问题之一,诱导轮作为提升离心泵空化性能的主要措施，它本身的空化性能十分关健。虽然已知进口含气量的增加会造成诱导轮空化性能的急剧恶化，但目前的研究大多数侧重于汽液两相空化现象，较少涉及气相、汽相和液相的多相流体输运，输送介质含气量对诱导轮内空化发生发展规律的影响规律亟需深入研究。. 本项目拟以高速诱导轮为研究对象，通过理论分析、数值模拟和内外特性实验，建立适合模拟气、汽、液相的多组分空化模型并开展诱导轮内空化数值计算，研究非凝性气体和空化泡共同作用下诱导轮内的湍流场结构，揭示输送介质含气量与诱导轮内空化流动的相互作用机制，确定两者共同作用下高速诱导轮的内外特性及其稳定运行范围，为高性能诱导轮的研制和设计应用提供理论支撑。

高速离心泵输送含气介质面临的多相空化问题是影响泵正常运行的关键问题之一，诱导轮作为提升离心泵空化性能的主要措施，它本身的空化性能十分关健。输送介质含气量对诱导轮内空化发生发展规律的影响规律亟需深入研究。.本项目以高速诱导轮为研究对象，研究了来流含气对高速诱导轮空化发生发展规律的影响。通过理论分析、数值模拟、可视化和外特性实验，完善了适用于诱导轮内部多组分空化流动计算模型；分析了不同来流含气量和叶顶间隙下诱导轮内气液两相流场结构和分布，揭示含气量和叶顶间隙对诱导轮性能的影响规律；采用高速摄像观测到诱导轮内叶顶泄漏涡空化、片状空化和云状空化、回流涡空化、不对称空化和空化喘振效应等现象，揭示了诱导轮内空化发生、发展及恶化的时空演变过程；分析了空化发展对流动特性和性能的影响规律，获得空化发展过程诱导轮、叶轮和蜗壳内压力脉动规律；揭示了含气量与诱导轮内空化流动的相互作用机制，为高性能诱导轮的研制和设计应用提供理论支撑。.通过研究共发表论文12篇，其中SCI/EI论文9篇，国际会议2篇和国内大会报告1篇；国外SCI期刊上发表学术论文6篇，国内SCI论文2篇和EI论文1篇；授权发明专利3项、实用新型专利5项；在站博士后1名、毕业博士生1名、在培博士生1名、毕业硕士生7名，晋升教授和副教授职称各1人，获钱江特聘教授和浙江省万人计划杰出人才荣誉；承办国际和国内学术会议各1次；获中国机械工业科学技术奖一等奖1项。