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Numerical Investigation on Fluid Structure Interaction Considering Rotor Deformation for a Centrifugal Pump

Chinese Journal of Mechanical Engineering 2011年第4期24卷 539-545页

作者： yuan Shouqi pei Ji yuan Jianping Research Center of Fluid Machinery Engineering and Technology Jiangsu University Zhenjiang 212013 China

The existing research for unsteady flow field and the corresponding flow induced vibration analysis of centrifugal pump are mainly carried out respectively without considering the interaction between fluid and structure. The ignorance of fluid structure interaction （FSI） means that the energy transfer between fluid and structure is neglected. To some extent, the accuracy and reliability of unsteady flow and rotor deflection analysis should be affected by this interaction mechanism. In this paper, a combined calculation between two executables for turbulent flow and vibrating structure was established using two-way coupling method to study the effect of FSI. Pressure distributions, radial forces, rotor deflection and equivalent stress are analyzed. The results show that the FSI effect to pressure distribution in flow field is complex. The pressure distribution is affected not only around impeller outlet where different variation trends of pressure values with and without FSI appear according to different relative positions between blade and cutwater, but also in the diffusion section of volute. Variation trends of peak values of radial force amplitude calculated with and without FSI are nearly same under high flow rate and designed conditions while the peak value with FSI is slightly smaller, and differently, the peak value with FSI is larger with low flow rate. In addition, the effect of FSI on the angle of radial force is quite complex, especially under 0.5Q condition. Fluctuation of radial deflection of the rotor has obvious four periods, of which the extent is relatively small under design condition and is relatively large under off-design condition. Finally, fluctuations of equivalent stress with time are obvious under different conditions, and stress value is small. The proposed research establishes the FSI calculation method for centrifugal pump analysis, and ensures the existing affect by fluid structure interaction.

关键词： centrifugal pump fluid structure interaction coupled solution unsteady turbulent flow basic theory

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Shape Error Analysis of Functional Surface Based on Isogeometrical Approach

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Chinese Journal of Mechanical Engineering 2017年第3期30卷 544-552页

作者： pei yuan Zhenyu LIU Jianrong TAN state key lab of cad&cg zhejiang universityHangzhou 310027China

The construction of traditional finite element geometry （i.e., the meshing procedure） is time consuming and creates geometric errors. The drawbacks can be over- came by the Isogeometric Analysis （IGA）, which integrates the computer aided design and structural analysis in a unified way. A new IGA beam element is developed by integrating the displacement field of the element, which is approximated by the NURBS basis, with the internal work formula of Euler-Bernoulli beam theory with the small deformation and elastic assumptions. Two cases of the strong coupling of IGA elements, ＂beam to beam＂ and ＂beam to shell＂, are also discussed. The maximum relative errors of the deformation in the three directions of can- tilever beam benchmark problem between analytical solu- tions and IGA solutions are less than 0.1%, which illustrate the good performance of the developed IGA beam element. In addition, the application of the developed IGA beam element in the Root Mean Square （RMS） error analysis of reflector antenna surface, which is a kind of typical func- tional surface whose precision is closely related to the product＇s performance, indicates that no matter how coarse the discretization is, the IGA method is able to achieve the accurate solution with less degrees of freedom than stan- dard Finite Element Analysis （FEA）. The proposed research provides an effective alternative to standard FEA for shape error analysis of functional surface.

关键词： RMS error Isogeometric analysis Euler-Bernoulli beam

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Time delay and extended halo for constraints on the intergalactic magnetic field

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Research in Astronomy and Astrophysics 2015年第12期15卷 2173-2186页

作者： yuan-pei Yang Zi-Gao Dai School of Astronomy and Space Science Nanjing University Key Laboratory of Modern Astronomy and Astrophysics (Nanjing University) Ministry of Education

Primary gamma rays emitted from extragalactic very-high-energy （VHE） sources, such as blazars, will generate cascade radiation in intergalactic space with a scale of -- 100 Mpc, for z - 0.1 and Eγ -1 TeV. These cascades proceed through electron-positron pair production and inverse Compton （IC） scattering in the cosmic background radiation fields, mainly cosmic microwave background （CMB） radiation and extragalactic background light in the voids of the universe. The existence of an intergalactic magnetic field （IGMF） would deflect paths of electron-positron pairs that scatter CMB photons, causing some observable effects, such as time delay, an ex- tended halo, and a spectral change. Here we reanalyze the diffusion of an electron jet deflected by IGMF and propose a unified semi-analytical model. By using publicly available data from the Fermi/LAT detector and contemporaneous TeV observations, we find that the cascade photon flux is not significantly affected by the IGMF strength for non-variable blazars when the IGMF is weaker than ,-~ 10-16 G. This result is clearly different from previous works that analyzed the extended halo and time de- lay separately for non-variable blazars and flaring blazars. By applying our model to two extreme blazars （1ES 0229＋200 and 1ES 1218＋304）, we obtain the IGMF lower limit of order ≥10-13 --10-14 G in the non-variable case, which is a stronger constraint on the IGMF strength than previous works （≥10-16 ,-- 10-18 G）, and ≥10-18 -- 10-19 G in the case of flaring blazars. Furthermore, we study the light curves and extended halo of the cascade photons by considering the effects of the IGME

关键词： gamma rays: general -- galaxies: magnetic field -- galaxies: individual(1ES 0229+200 1ES 1218+304)

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Shape of slab solidification end under non-uniform cooling and its influence on the central segregation with mechanical soft reduction

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International Journal of Minerals,Metallurgy and Materials 2021年第11期28卷 1788-1798页

作者： Jie Li Yan-hui Sun Hang-hang An pei-yuan Ni Collaborative Innovation Center of Steel Technology University of Science and Technology BeijingBeijing 100083China School of Metallurgy Northeastern UniversityShenyang 110819China Hesteel Group Technology Research Institute Shijiazhuang 050000China

In order to study the effect of continuous casting process parameters on the shape of slab solidification end under non-uniform cooling,a solidification model of a continuous-cast slab with non-uniform cooling condition was established with ProCAST *** model was verified by the results of nail shooting tests and the infrared temperature measurement *** characteristic parameters were defined to evaluate the uniformity of the shape of slab solidification *** results showed that the nonuniformity at the beginning and end of solidification,the solidification end length,and the solidification unevenness increased with the rise of casting *** each 10°C increase of superheat,the solidification unevenness increased by about ***,the effect of superheat on the solidification end length can be *** secondary cooling strength showed minimal effect on the nonuniformity at the beginning and end of *** the increase in secondary cooling intensity,the solidification end length decreased,but the solidification unevenness *** addition,the central segregation of the slab produced with and without the mechanical soft reduction(MSR)process was *** transverse flow of molten steel with low solid fraction influenced the central segregation morphology under MSR.

关键词： continuous casting heat transfer model nail shooting shape of solidification end central segregation

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Explicit Forms of q-Deformed Lévy-Meixner Polynomials and Their Generating Functions

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Acta Mathematica Sinica,English Series 2008年第2期24卷 201-214页

作者： Zhi yuan HUANG pei Yan LI Ying WU Department of Mathematics Huazhong University of Science and Technology Wuhan 430074 P. R. China

The classical Levy-Meixner polynomials are distinguished through the special forms of their generating functions. In fact, they are completely determined by 4 parameters： c1, c2,γ and β. In this paper, for-1 〈q〈 1, we obtain a unified explicit form of q-deformed Levy-Meixner polynomials and their generating functions in term of c1, c2, γand β, which is shown to be a reasonable interpolation between classical case （q=1） and fermionic case （q=-1）.In particular, when q=0 it＇s also compatible with the free case.

关键词： q-deformation Levy-Meixner polynomials generating function free probability

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Parametric Modeling of Circuit Model for AC Glow Discharge in Air

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Transactions of Nanjing University of Aeronautics and Astronautics 2018年第4期35卷 710-718页

作者： Yu Bing yuan pei Shen Enyu Shu Wenjun Jiangsu Province Key Laboratory of Aerospace Power Systems College of Energy and Power EngineeringNanjing University of Aeronautics and Astronautics Nanjing 210016 P.R. China

In the parametric modeling of the circuit model for glow discharge in air,a new method for the design of glow discharge circuit model is *** new circuit model is an important reference for the design of plasma power supply,the simulation of glow discharge plasma actuator and the simulation of glow discharge plasma *** modeling approach consists in developing an electrical model of the glow discharge in air based on circuit *** structure of the circuit model is established according to the theoretical analysis and the experimental *** the parameters of the circuit model are obtained based on the circuit ***,the circuit model is verified by comparing the simulation current with the experimental *** model takes into account the whole framework of the air glow discharge including the sheath and the plasma *** built circuit model is feasible and reliable,thus being instructive for the investigation of the glow discharge in air.

关键词： parametric modeling glow discharge circuit model OrCAD

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Special issue on continuous casting

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Journal of Iron and Steel Research International 2022年第1期29卷 1-2页

作者： Le-jun Zhou Ying Ren pei-yuan Ni School of Metallurgical and Environment Central South UniversityChangsha 410083HunanChina School of Metallurgical and Ecological Engineering University of Science and Technology BeijingBeijing 100083China Key Laboratory of Ecological Metallurgy of Multi-metal Intergrown Ores of Education Ministry School of MetallurgyNortheastern UniversityShenyang 110819LiaoningChina

Continuous casting is considered to be one of the most important innovations in steel industry since it is first propagated by Henry Bessemer in *** has many benefits,including(Ⅰ)increased yield,(Ⅱ)improved product quality,(Ⅲ)energy saving,(Ⅳ)less pollution,(Ⅴ)reduced costs,(Ⅵ)better working conditions,***,more than 98% of crude steel output in the world is produced through the continuous casting process.

关键词： casting steel process.

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Special issue on numerical simulation of multiphase and multiscale metallurgical processes

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Journal of Iron and Steel Research International 2023年第6期30卷 1057-1058页

作者： Zhong-qiu Liu Jun Li pei-yuan Ni School of Metallurgy Northeastern UniversityShenyang 110819LiaoningChina School of Materials Science and Technology Shanghai Jiao Tong UniversityShanghai 200240China

Steel production process is a multiphase and multiscale high-temperature metallurgical process involving complex physical behaviours and chemical *** movement of high-temperature melts closely affects the cleanliness,homogenization,and refinement of high-quality ***,due to the high temperature,invisibility,and difficult quantification of metallurgical process,the data that can be measured in high-temperature melts during production process are limited.

关键词： multiphase melts process

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Exact quantum query complexity of weight decision problems via Chebyshev polynomials

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Science China(Information Sciences) 2023年第2期66卷 297-298页

作者： Xiaoyu HE Xiaoming SUN Guang YANG pei yuan Institute of Computing Technology Chinese Academy of Sciences (CAS) University of Chinese Academy of Sciences

The weight decision problem, which requires determining the Hamming weight of a given binary string, is a natural and important problem with lots of applications, such as cryptanalysis [1] and coding theory. In this study, we investigate the exact quantum query complexity of weight decision problems, where the exact quantum algorithm must always output the correct answer within finite steps(see Appendix A for a detailed explanation).

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Flow field, heat transfer and inclusion behavior in a round bloom mold under effect of a swirling flow submerged entry nozzle

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Journal of Iron and Steel Research International 2023年第6期30卷 1211-1221页

作者： Qing-hua Xie pei-yuan Ni Toshihiro Tanaka Mikael Ersson Ying Li Key Laboratory of Ecological Metallurgy of Multi-metal Intergrown Ores of Ministry of Education School of MetallurgyNortheastern UniversityShenyang 110819LiaoningChina Liaoning Key Laboratory of Metallurgical Sensor Materials and Technology School of MetallurgyNortheastern UniversityShenyang 110819LiaoningChina Graduate School of Engineering Osaka UniversityOsaka 565-0871Japan Department of Materials Science and Engineering KTH Royal Institute of TechnologyStockholm 10044Sweden

Flow field,heat transfer and inclusion behavior in a 700 mm round bloom mold under the effect of a swirling flow submerged entry nozzle(SEN)were investigated with the aim to enhance the casting *** results indicate that the impinging flow phenomenon,which is commonly observed in conventional single-port SEN casting,was completely suppressed by the swirling flow SEN coming from a novel swirling flow generator design in *** from the SEN port moved towards the mold wall in 360 direction,leading to a uniform temperature distribution in the *** to a conventional single-port SEN casting,the steel super-heat was decreased by about 5 K at the mold center,and the temperature was increased by around 3.5 K near the *** addition,the removal ratio of inclusions to the mold top surface in the swirling flow SEN casting was found to be ***,the removal ratio of spherical inclusions with diameters of 1,10,50 and 100μm was increased by 18.2%,18.5%,22.6% and 42.7%,***,the ratio was raised by 18.2%,20.8%,21.5% and 44.1%for non-spherical inclusions,respectively.

关键词： Large round bloom Swirling flow submerged entry nozzle casting Flow field Heat transfer Inclusion behavior

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