Abstract:A threedimensional unsteady CFD simulation method was established based on the RANS equations and Spalart-Allmaras turbulence model by varying rotating speed of reference frame and sliding mesh techniques to simulate the transient flow in an axial pump unit model in the runaway caused from power failure. The governing equations of fluid flow are discretized with the finite volume method; the temporal item is approximated with a firstorder backward difference implicit scheme, a secondorder central difference scheme is applied to the source and diffusion items, a secondorder upwind scheme is for the convection items, and the velocitypressure coupling method is chosen to be SIMPLEC. A steady simulation was performed first for providing an initial condition to the transient case. The results showed that the pump attained its runway speed in 20.35 s. The estimated runway speeds were 1 610 r/min and 1 989 r/min by two techniques, comparing with the experimental speed of 1 720 r/min. Additionally, the pump rotational speed, flow rate, torque and static pressure at monitor points against time were revealed during the transient period. These data will provide a reference for pump design and operation of pumping station.
周大庆, 钟淋涓, 郑源, 茅媛婷. 轴流泵装置模型断电飞逸过程三维湍流数值模拟[J]. 排灌机械工程学报, 2012, 30(4): 401-406.
ZHOU Da-Qing, Zhong-Lin-Juan, Zheng-Yuan, Mao-Yuan-Ting. Numerical simulation of transient flow in axialflow pump unit model during runaway caused from power failure. Journal of Drainage and Irrigation Machinery Engin, 2012, 30(4): 401-406.
[1]Thanapandi P,Rama Prasad. Centrifugal pump transient characteristics and analysis using the method of characteristics [J]. International Journal of Mechanical Sciences, 1995, 37(1):77-89.[2]黄良勇,李彦军,严登丰,等. 低扬程泵装置停泵过渡过程分析[J].农业机械学报,2006,37(4):52-55.Huang Liangyong, Li Yanjun, Yan Dengfeng, et al. Analysis on transient process in lowhead pumping installation during its suspending period [J]. Transactions of the Chinese Society for Agricultural Machinery,2006, 37(4):52-55. (in Chinese)[3]周大庆,张仁田,屈波,等. 大型立式轴流泵站停泵过渡过程研究[J]. 河海大学学报:自然科学版,2006,34(3):272-275.Zhou Daqing, Zhang Rentian, Qu Bo, et al. Research on hydraulic transient of vertical axialflow pumping station at power failure[J]. Journal of Hohai University:Natural Sciences, 2006,34(3):272-275. (in Chinese)[4]陈松山,何钟宁,周正富,等. 低扬程大型泵站停泵动态特性计算[J]. 水力发电学报,2007,26(5):128-133.Chen Songshan, He Zhongning, Zhou Zhengfu, et al. Study on transient process of low waterhead large pumping station while pumping off[J]. Journal of Hydroelectric Engineering, 2007,26(5):128-133. (in Chinese)[5]王松岭,王震. 离心泵在事故停泵过程中的动态特性研究[J]. 电力科学与工程,2007,23(3):45-47.Wang Songling, Wang Zhen. Research on the dynamic performance during the process of accidental pumpstop[J]. Electric Power Science and Engineering, 2007,23(3):45-47. (in Chinese)[6]王福军,白绵绵,肖若富. Flowmaster在泵站过渡过程分析中的应用[J]. 排灌机械工程学报,2010,28(2):144-148.Wang Fujun, Bai Mianmian, Xiao Ruofu. Analysis on hydraulic transients of pumping station with Flowmaster[J]. Journal of Drainage and Irrigation Machinery Engineering, 2010,28(2):144-148. (in Chinese)[7]Wan Wuyi, Huang Wenrui. Investigation on complete characteristics and hydraulic transient of centrifugal pump[J]. Journal of Mechanical Science and Technology, 2011,25 (10):2583-2590.[8]Liu S, Zhou D, Liu D,et al. Runaway transient simulation of a model Kaplan turbine[C]∥Proceedings of the IOP Conference Series: Earth and Environmental Science, 2010:012073.[9]Cherny S, Bannikov D D. 3D numerical simulation of transient processes in hydraulic turbines[C]∥Proceedings of the IOP Conference Series: Earth and Environmental Science, 2010:012071.[10]侯祎华,齐学义,张静,等. Spalart-Allmaras湍流模型在混流式长短叶片转轮流场计算中的应用[J]. 水力发电学报,2010,29(1):152-157.Hou Yihua, Qi Xueyi, Zhang Jing, et al. Application of Spalart-Allmaras turbulence model to flow calculation of Francis runner with splitter blades[J]. Journal of Hydroelectric Engineering, 2010,29(1):152-157. (in Chinese)