CAJ | 학술논문

为了解决南水北调淮安二站改造工程中，水泵水力模型TJ05-ZL-02与现场土建结构存在的轮毂比不对应的问题，该文基于 CFD 数值计算针对淮安二站主水泵进行改型分析研究。将轮毂比为0.4的 TJ05-ZL-02水力模型改成轮毂比为0.4667的新模型，确保改型之后的水泵模型跟TJ05-ZL-02水力模型性能相似，能够满足淮安二站调水、排涝的工程要求，同时应适当减小流量系数，适当降低高效区扬程。在改型设计时，研究主要设计参数对轴流泵性能的影响，控制叶片性能变化的方向，采用CFD数值计算的方法，对设计参数改变后的轴流泵水力性能进行验证，确定最终的改型设计方案。通过数值模拟对TJ05-ZL-02和改型的最终设计方案进行泵装置性能研究。最后将改型方案的模型泵装置试验结果与数值模拟结果对比，近一步对改型方案的可行性进行论证分析。研究结果表明：改型后轴流泵性能高效区扬程和流量，完全能够满足淮安二站运行要求；改型后轴流泵装置效率超过了70%，而原先淮安二站运行效率仅有54%，效率提高近20%，提高了调水性能，节约了运行成本；同时研究成果对今后的轴流泵改型设计具有重要的指导意义。
위료해결남수북조회안이참개조공정중，수빙수력모형TJ05-ZL-02여현장토건결구존재적륜곡비불대응적문제，해문기우 CFD 수치계산침대회안이참주수빙진행개형분석연구。장륜곡비위0.4적 TJ05-ZL-02수력모형개성륜곡비위0.4667적신모형，학보개형지후적수빙모형근TJ05-ZL-02수력모형성능상사，능구만족회안이참조수、배로적공정요구，동시응괄당감소류량계수，괄당강저고효구양정。재개형설계시，연구주요설계삼수대축류빙성능적영향，공제협편성능변화적방향，채용CFD수치계산적방법，대설계삼수개변후적축류빙수력성능진행험증，학정최종적개형설계방안。통과수치모의대TJ05-ZL-02화개형적최종설계방안진행빙장치성능연구。최후장개형방안적모형빙장치시험결과여수치모의결과대비，근일보대개형방안적가행성진행론증분석。연구결과표명：개형후축류빙성능고효구양정화류량，완전능구만족회안이참운행요구；개형후축류빙장치효솔초과료70%，이원선회안이참운행효솔부유54%，효솔제고근20%，제고료조수성능，절약료운행성본；동시연구성과대금후적축류빙개형설계구유중요적지도의의。
This paper studied the selection and modification of the main pumps of the second pumping station of Huai’an by using CFD. The study analyzed the operation status of the main pumps and confirmed the necessity of reinforcement of the main pumps of the second pumping station of Huai’an. Selecting the main pumps for the second pumping station of Huai’an was carried out based on its operation data over these years, and the excellent hydraulic model of TJ05-ZL-02 was chosen. The hub ratio of the hydraulic model TJ05-ZL-02 is 0.4, while the original hub ratio of the second pumping station of Huai’an is 0.4667. Therefore, the hub ratio of the chosen hydraulic model must be modified. At the same time, to meet the requirements of diversion, drainage engineering of the second pumping station of Huai’an ensured that the pump model modified has the similar performance with the chosen hydraulic model, reduce the coefficient of flow and decrease the head of the high efficient area. First of all, this paper analyzed the influence of the main parameters including cascades dense degree and blade angle of each section on the hydraulic performance of axial-flow pumps. Which controlling the change of directions of the blade hydraulic performance. And use CFD to verify the hydraulic performance of the axial-flow pump when parameters changes. then decided the final retrofit design program. The feasibility of retrofitting program has been demonstrated through the numerical simulation of comparing the axial-flow pumps device before and after modification. Numerical simulation of the pump device adopts the standardk-ε model, and calculated the six flow point at 280, 300, 320, 340, 360 and 380 L/s, respectively. Finally, the experimental studies of the model pump showed that, model test performance curve trend was consistent with the numerical performance curve. According to flow-head curve , there is a little deviation in small flow area, and the flow-efficiency curve fit well, the performance of numerical simulation and experimental study has been mutual authentication. The head is in the range of 3.5 to 4.5 m, and the flow of 300 to 350 L/s after modification, which will fully meet the requirements of diversion, drainage and irrigation of the second pumping station of Huai’an for current and future. After modifications, the efficiency of axial-flow pumps device was over 70%, while the efficiency of the second pumping station of Huai’an initially was 68%, with nearly 20% increased, which play a huge role in increasing diversion performance and reducing cost. And the research shows that hub ratio of modified pump increasing may decline the overall performance of axial-flow pump, which indicates that there is the most optimal hub ratio for a specific speed of axial-flow pump,. It has very important significance for the optimal design of axial-flow pump hydraulic model and the large-scale pumping station renovation.