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| 1 | Analysis of the Pump-turbine S Characteristics Using the Detached Eddy Simulation Method显示文摘Current research on pump-turbine units is focused on the unstable operation at off-design conditions, with the characteristic curves in generating mode being S-shaped. Unlike in the traditional water turbines, pump-turbine operation along the S-shaped curve can lead to difficulties during load rejection with unusual increases in the water pressure, which leads to machine vibrations. This paper describes both model tests and numerical simulations. A reduced scale model of a low specific speed pump-turbine was used for the performance tests, with comparisons to computational fluid dynamics(CFD) results. Predictions using the detached eddy simulation(DES) turbulence model, which is a combined Reynolds averaged Naviers-Stokes(RANS) and large eddy simulation(LES) model, are compared with the two-equation turbulence mode results. The external characteristics as well as the internal flow are for various guide vane openings to understand the unsteady flow along the so called S characteristics of a pump-turbine. Comparison of the experimental data with the CFD results for various conditions and times shows that DES model gives better agreement with experimental data than the two-equation turbulence model. For low flow conditions, the centrifugal forces and the large incident angle create large vortices between the guide vanes and the runner inlet in the runner passage, which is the main factor leading to the S-shaped characteristics. The turbulence model used here gives more accurate simulations of the internal flow characteristics of the pump-turbine and a more detailed force analysis which shows the mechanisms controlling of the S characteristics. | SUN Hui XIAO Ruofu WANG Fujun XIAO Yexiang LIU Weichao | 2015 | Chinese Journal of Mechanical Engineering2015，28，1： | 10 |
| 2 | A general alternate loading technique and its applications in the inverse designs of centrifugal and mixed-flow pump impellers显示文摘For the inverse designs of centrifugal and mixed-flow pump impellers,clarifying the generation process of secondary flows and putting forward corresponding suppression measures is an important approach to improve the impeller performance.In this paper,to provide a better qualitative insight into the generation mechanism of secondary flows in the impeller,a simple kinematic equation is derived based on the ideal assumptions,which indicates that the potential rothalpy gradient(PRG)is the most important dynamic source that actively induces secondary vortical flows.Induced by the natural adverse PRG on the S1 and S2 stream surfaces,two typical secondary flows,H-S and P-S secondary flows,are clearly presented.To specially suppress these typical secondary flows,a general alternate loading technique(GALT)is proposed,aiming to adjust the real blade loadingδp to control the PRG features.At the blade fore part,theδp on the hub streamline should be slowly increased to avoid breakneck growth of the potential rothalpy to reduce adverse streamwise PRG on the S2 streamsurface.At the blade middle part,theδp should be moderately decreased to reduce adverse streamwise PRG on the S1 streamsurface.At the blade aft part,the difference in theδp between the shroud and hub streamlines should be decreased faster to control the exit uniformity.By applying the GALT to the impeller designs of three typical pump types in hydraulic engineering,the organizational effect of the PRG on fundamental flow structures is proven.The GALT can effectively control the PRG distributions and suppress the secondary flows,thereby widening the pump’s high-efficiency zone,improving flow uniformity and suppressing pressure fluctuations.Compared with the current Z-G method and the ALT,the GALT can meet the requirements of'de-experience'better,thereby enabling the designers to obtain good products explicitly and quickly. | WANG ChaoYue WANG FuJun AN DongSen YAO ZhiFeng XIAO RuoFu LU Li HE ChengLian ZOU ZhiChao | 2021 | Science China(Technological Sciences)2021，64，4： | 7 |
| 3 | Elastic Scattering of 7Be on Pb Target显示文摘 | Yang Yanyun Wang Jiansong Wang Qi Huang Meirong Ma Junbing Ma Peng Cao Xiguang Han Jianlong Bai Zhen Jin Shilong Hu Qiang Jin Lei Chen Jiangbo Zhang Xueying Chen Ruofu Hu Zhengguo Xu Shiwei Zhen Chuan Xu Zhiguo Xu Hushan Duan Liming Sun Zhiyu Chen Zhiqiang He Jianjun Li Songlin Lei Xiangguo Fu Fen Zhang Xueheng Yuan Xiaohua Du Chengming Yan Xinshuang Hu Jun Tang Shuwen Ye Ruiping Yang Kun Shi Fudong Zhang Wei Chen Ze Li Long Xu Xing Liu Longxiang Zhang Liyong Lin Qingyun Gou Boxing Xu Ge Zhou Xionghong Zhang Yuhu Xiao Guoqing | 2011 | IMP & HIRFL Annual Report2011，，1： | 4 |
| 4 | 2-14 Investigation of the Thermonuclear 18Ne(α, p)21Na Reaction Rate via Resonant Elastic Scattering of 21Na + p显示文摘A nuclear astrophysics experiment was performed at CRIB (CNS low-energy Radioactive-Ion Beam separator)on Mar. 2011. The goal of this experiment is to study the reaction rate of 18Ne(,p)21Na reaction, which mightbe a key breakout reaction from the hot CNO cycle to rp-process in X-ray burst and nova. Yet its reaction rate ispoorly known.Explosive hydrogen burning is thought to be the main source of energy generation and a source of nucleosynthesisin X-ray burst and nova[1;2]. For example, XRBs are characterized by a sudden increase of X-ray emission withinonly a few seconds to a total energy output of about 1040 ergs, which is observed to repeat with some regularity.The recurrence time for single bursts can range from hours to days at the typical temperature of 0.4~2 GK. Thebursts have been interpreted as being generated by thermonuclear runaway on the surface of a neutron star thataccretes H- and He-rich material from a less evolved companion star in a close binary system. As shown in Fig. 1,under its typical temperature, the hydrogen burning in X-ray burst occurs from the hot CNO cycle: | Zhang Liyong He Jianjun Xu Shiwei H.Yamaguchi S. Kubono Y.Wakabayashi Chen Size Hu Jun Ma Peng Y. Togano T. Hashimoto D. Kahl T. Teranishi Chen Ruofu Wang Hongwei Tian Wendong Guo Bing S. Hayakawa N. Iwasa T. Yamada T. Komatsubara | 2014 | IMP & HIRFL Annual Report2014，，1： | 2 |
| 5 | CT evaluation of cervical pedicle in a Chinese population for surgical application of transpedicular screw placement 显示文摘 | Ruofu Z Huilin Y Xiaoyun H | 2008 | Surg Radiol Anat2008，30，5： | 1 |
| 6 | CT evaluation of cervical pediclein a Chinese population for surgical application of transpedicular screwplacement显示文摘 | Ruofu Z Huilin Y Xiaoyun H | 2008 | Surg Radiol Anat2008，5，： | 1 |
| 7 | Dynamic stresses in a francis turbine runner based on fluid-struc- ture interaction analysis 显示文摘 | Xiao Ruofu Wang Zhengwei Luo Yongyao | 2008 | Tsinghua Science and Technology2008，10，13： | 1 |
| 8 | CT evaluation of cervical pedi-cle in a Chinese population for surgical application oftranspedicularscrew placement显示文摘 | Ruofu Z Huilirl Y Xiaoyun H | 2008 | Surg Radiol Anal2008，5，： | 1 |
| 9 | CT evaluation of cervical pedicle in a Chinese population for surgical application of transpedicular screw placement显示文摘 | Zhu Ruofu Yang Huilin Hu Xiaoyun He Xishun Tang Tiansi Chen Liang Li Xigong | 2008 | Surgical and Radiologic Anatomy2008，，5： | 1 |
| 10 | CT evaluation of cervical pedicle in a Chinese population for surgical application of transpedicular screw placement显示文摘 | Ruofu Z Huilin Y Xiaoyun H | 2008 | Surg Radiol Anat2008，30，5： | 1 |
| 11 | CT evaluation of cervical pedicle in a Chinese population for surgical application of transpedicular screw placement显示文摘 | RUOFU Z HUILIN Y XIAOYUN H | 2008 | Surgical and Radiologic Anatomy2008，30，5： | 1 |
| 12 | CT evaluation of cervical pedicle in a Chinese population for surgical application of transped- icular screw placement 显示文摘 | Ruofu Z Huilin Y Xiaoyun H | 2008 | Surg Radiol Anat2008，30，5： | 1 |
| 13 | Multiobjective optimization design of a pump-turbine impeller based on an inverse design using a combination optimization strategy显示文摘 | Yang Wei Xiao Ruofu | 2013 | Journal of Fluids Engineering2013，136，1： | 1 |
| 14 | Distribution of YAP in 10 populations of China显示文摘The Y_chromosome Alu polymorphism was studied in 10 populations in China. The Alu insertion is present in 54/571 individuals (9%). Among 10 populations, the frequency of YAP element is quite high (49%) in the Tibetans and at moderate or low levels (15%-4%) in the Yi, Hui and Uygur. The Alu insertion is absent in the Han in Guangdong and Shaanxi, and in the Manchu and Zhuang, while a single Tujia individual and a single Yao individual are found to have the Alu insertion. | Xu Liping Xu Jiujin Zhu Suling Bao Weidong Du Ruofu | 1998 | Chinese Science Bulletin1998，43，12： | 1 |
| 15 | Analysis of s characteristics and pressure pulsations in a pump-turbine with misaligned guide vanes显示文摘 | Sun Hui Xiao Ruofu Liu Weichao | 2013 | Journal of Fluids Engineering2013，135，5： | 1 |
| 16 | CT evaluation of cervical pedicle in a Chinese population for surgical application of transpedicular screw placement显示文摘 | Ruofu Z Huilin Y Xiaoyun H | 2008 | Surgical and Radiologic Anatomy2008，5，： | 1 |
| 17 | CT evaluation of cervical pedicle in a Chinese population for surgical application of transpedicular Screw placement显示文摘 | Ruofu Z Huilin Y Xiaoyun H | 2008 | Surg Radiol Anat2008，30，5： | 1 |
| 18 | Com- parisons of three anterior cervical surgeries in treating cervical spondylotic myelopathy 显示文摘 | ZHU Ruofu YANG Huilin WANG Zhidong | 2014 | BMC Musculoskelet Disord2014，15，1： | 1 |
| 19 | 5-24 Application of CsI(Tl) Crystals for the Imaging显示文摘Depend on the good performance, the CsI crystal developed by the Crystal Detector Group has a good reputation in the international market. So far, In addition to meeting the needs of the external target experimental terminal in the CSR, pieces of CsI(Tl) crystals have been sold to some international and domestic research institutes, colleges and universities. They have been used for kinds of experiments in some well-known labs in German, America and Japan, and so on. | Shi Guozhu Chen Ruofu Li Songlin Shen Aihua Li Hengyuan | 2015 | IMP & HIRFL Annual Report2015，，1： | 0 |
| 20 | Experimental Study 18Ne(a,p)21Na of Key Astrophysical Reaction显示文摘 | Zhang Liyong He Jianjun Xu Shiwei H. Yamaguchi S. Kubono Y. Wakabayashi Chen Size Ma Peng Y. Togano T. Hashimoto D. Kahl T. Teranishi Chen Ruofu Wang Hongwei Tian Wendong Guo Bing S. Hayakawa N. Iwasa T. Yamada T. Komatsubara | 2011 | IMP & HIRFL Annual Report2011，，1： | 0 |
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