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China Ocean Engineering 2024年第1期38卷 18-28页

作者： HU Ze-bo LIU Zhen LI Peng GUO Hai-yan WANG Shu-bing REN Xiao-hui HOU Hao WANG Ye-shuo College of Civil Engineering and Architecture Shandong University of Science and TechnologyQingdao 266590China Qingdao Key Laboratory of Marine Civil Engineering Materials and Structures Qingdao 266590China College of Engineering Ocean University of ChinaQingdao 266100China CHEC Dredging Co. LtdShanghai 200136China

A vortex-induced vibration(VIV)experiment of rough risers with coupling interference effect under a side-by-side arrangement was carried out in a wave-current combined *** roughness of the riser was characterized by arranging different specifications of surface attachments on the surface of the *** risers with three different roughnesses were arranged side by side with smooth risers to explore the VIV response of the riser under the combined action of roughness and interference effect,and to reveal the coupling mechanism between roughness and interference *** experimental results show that,compared with that of a smooth riser,the VIV of a rough riser under the coupling interference effect has a wider"lock-in"region,and the displacement decreases more significantly at a high reduced velocity,which is more likely to excite higher-order modes and frequency *** addition,the displacement response and frequency response of the smooth riser are not significantly affected by wake interference from the rough riser,which is caused by the decrease of the wake region due to the delay of the boundary layer separation point of the rough riser.

关键词： marine riser vortex-induced vibration side-by-side arrangement roughness interference effect

Experimental Study on Vortex-Induced Vibration of Rough Risers Coupling with interference effect in Tandem Arrangement

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China Ocean Engineering 2024年第3期38卷 394-407页

作者： HU Ze-bo LIU Zhen LI Peng GUO Hai-yan REN Xiao-hui HOU Hao HAO Lian-hong College of Civil Engineering and Architecture Shandong University of Science and TechnologyQingdao 266590China Qingdao Key Laboratory of Marine Civil Engineering Materials and Structures Qingdao 266590China College of Engineering Ocean University of ChinaQingdao 266100China

In order to study the response law of vortex-induced vibration(VIV)of marine risers under the combined action of roughness and interference effects,and to reveal the coupling mechanism of roughness and interference effects on the riser,a VIV experiment of rough risers in tandem arrangement was conducted in a wave−current combined *** experiment characterized the risers’roughness by arranging different specifications of attachments on the surface of the *** rough risers with different roughness and smooth risers were arranged in tandem arrangement,with the rough risers arranged *** experimental results indicate that the suppression of the attachments on the downstream risers’vibration are more significant both in the CF and IL directions as the reduced velocity *** the downstream riser,the amplitude response of rough riser is more significantly weakened compared with the smooth one at high reduced *** the upstream risers,changes in the roughness and spacing ratio have an impact on their‘lock-in’*** the roughness of downstream risers is relatively large(0.1300)and the spacing between risers is small(S/D=4.0),the reduced velocity range of‘lock-in’region in the CF direction of upstream risers is obviously expanded,and the displacement in the‘lock-in’region is severer.

关键词： marine riser vortex-induced vibration tandem arrangement roughness interference effect

Experimental Study on Vortex-Induced Vibration of Marine Riser Model with Coupling interference effect Under Combined Internal and External Flow

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中国海洋工程:英文版 2023年第4期37卷 673-684页

作者： REN Xiao-hui LI Peng CHEN Xin WANG Ye-shuo LIU Zhen HAO Lian-hong WANG Yu HUANG Yi-jie College of Architecture and Civil Engineering Shandong University of Science and TechnologyQingdao 266590China Qingdao Key Laboratory of Marine Civil Engineering Materials and Structures Qingdao 266590China School of Petroleum Engineering China University of Petroleum(East China)Qingdao 266580China

A partition model of interference efficiency was constructed to study the coupling interference effect under combined internal and external *** concept of“internal flow efficiency”,“velocity ratio”and“interference efficiency”were introduced to quantify the effect of internal flow and interference,and reveal the coupling mechanism among internal flow,external flow and interference *** results showed that the dynamic response of risers under variable angles was significantly different after considering the effect of internal *** the external flow velocity was smaller than 0.25 m/s,the vibration of risers was promoted by the internal *** the increase of external flow velocity,the effect of internal flow was weakened and the dynamic response of riser mainly depended on the external flow and interference *** the effect of different internal flow,the interference efficiency had similar change *** interference effect amplified the complex secondary flow effect inside the riser,making the dynamic response of riser complex and *** this paper,the overlap area and subdivision criterion of interference effect were constructed within the range of experimental velocity ratio,and the change curve of interference efficiency was obtained with an average meaning,which may have important practical meaning.

关键词： marine riser vortex-induced vibration internal flow interference effect interference efficiency internal flow efficiency

Tunneling of Bose-Einstein condensate and interference effect in a harmonic trap with a Gaussian energy barrier

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Chinese Physics B 2011年第6期20卷 45-48页

作者：花巍李彬刘学深 Institute of Atomic and Molecular Physics Jilin University

The tunneling effect of Bose-Einstein condensate （BEC） in a harmonic trap with a Gaussian energy barrier is studied in this paper. The initial condensate evolves into two separate moving condensates after the tunneling time under certain conditions. The interference pattern between the two moving condensates is given as a comparison and as a further demonstration of the existence of the global phase.

关键词： Bose Einstein condensate tunneling effect interference effect

interference effect on the liquid-crystal-based Stokes polarimeter

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Chinese Physics B 2020年第12期29卷 286-296页

作者：侯俊峰王东光邓元勇张志勇孙英姿 Key Laboratory of Solar Activity National Astronomical ObservatoriesChinese Academy of SciencesBeijing 100101China School of Astronomy and Space Science University of Chinese Academy of SciencesBeijing 101408China

The Stokes polarimeter based on liquid crystal variable retarders(LCVRs)is envisaged as a promising novel technique for polarization measurement in space applications due to the inherent advantage of eliminating the need for conventional rotating polarizing optics and increasing the measuring ***,the intrinsic multi-beam interference in LCVRs limits its polarization accuracy by several *** to eliminate the influence of the interference effect becomes an urgent issue for the liquid-crystal-based Stokes *** present study introduces a simplified but effective interference model based on the thin-film optics and polarized light theory to simulate the relationship between the interference effect of the LCVRs-based Stokes polarimeter and the polarization *** simulation results show that the transmittance variation of LCVR with the derived voltage is caused by multi beam interference between the indium tin oxide(ITO)film and the liquid crystal within LCVR,which produces a few percent of instrumental *** instrumental polarization is about 0.01 and different for different *** optimization method was proposed to reduce the instrumental polarization to 0.002,effectively improving the polarization sensitivity of the Stokes polarimeter limited by the *** addition,an experimental setup was built up to measure and analyze the influence of the interference effect of the LCVRs-based Stokes polarimeter on the polarization accuracy before and after the *** experiment results are in good agreement with the simulation.

关键词： polarimetry liquid crystal variable retarder(LCVR) interference effect

Research on Wind-induced Natural Ventilation with interference effect by Upstream Building

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Research on Wind-induced Natural Ventilation with Interferen...

Design strategy and relevant flow mechanisms of highly loaded 3D compressor tandem cascades

TheFirstInternationalCon...

作者： Chuanzhi Liang Neng Zhu Guohui Feng School of Environmental Science and Technology Tianjin University School of Municipal and Environmental Engineering Shenyang Jianzhu University

This paper aims at wind-induced natural ventilation with the interference effect produced by the upstream building in two perpendicular buildings. The computational fluid dynamics （CFD） method is employed. The data of wind tunnel experiment is used to validate this numerical method. It is found that the effect of wind-induced natural ventilation of the upstream building is much better than the downstream building. The interference effects are gradually reduced with the spacing of buildings increasing. The capable of wind-induced natural ventilation and its change law of downstream building with different space is analyzed. This paper point out that it is insignificant to increase the spacing to improve the capability of wind-induced natural ventilations in two perpendicular buildings when the prevailing wind is parallel to the central vertical line of them. The conclusion can help designer further utilize natural ventilation.

关键词： Natural ventilation Finite volume method interference effect Space between two buildings

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Chinese Journal of Aeronautics 2024年第7期37卷 220-235页

作者： Xiaochen MAO Yunyu WANG Zhihua DING Hao CHENG Bo LIU School of Power and Energy Northwestern Polytechnical UniversityXi’an 710129China The National Key Laboratory of Science and Technology on Aerodynamic Design and Research Xi’an 710129China Xi’an Thermal Power Research Institute Co.Ltd Xi’an 710072China

To investigate the design strategy of highly loaded tandem cascades at both the midspan and endwall,the overall performance and flow mechanisms of four typical tandem cascades based on the optimization were analyzed from multiple perspectives *** results show that the interference effects on the Front Blade(FB)and Rear Blade(RB)should not be overlooked during the design phase,and the design strategies at the midspan and endwall are completely *** the midspan,the optimization aims to increase the interference effects and the strength of the gap jet while maintaining the same load on the FB and ***,the endwall optimal airfoil exhibits weakening interference effects,advancement of the gap jet location,and load transfer from the FB to *** further analysis of flow characteristics,the midspan optimal airfoil is beneficial for inhibiting the low-energy fluid from interacting with the suction surface of RB under the design condition,but results in earlier occurrence of corner *** endwall optimal airfoil helps suppress the development of the secondary flow and delay the onset of corner ***,by combining the benefits of these two design approaches,additional forward sweep effects are achieved,further enhancing the performance of the tandem cascade.

关键词： Tandem cascade interference effect Vortex structure Load split Compressor

interference effects on the photoionization cross sections between two neighbouring atoms:nitrogen as an example

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Chinese Physics B 2009年第12期18卷 5283-5290页

作者：吴建华袁建民 Department of Physics National University of Defense Technology

interference effects on the photoionization cross sections between two neighbouring atoms are considered based on the coherent scattering of the ionized electrons by the two nuclei when their separation is less than or comparable to the de Broglie wave length of the ionized electrons. As an example, the single atomic nitrogen ionization cross section and the total cross sections of two nitrogen atoms with coherently added photoionization amplitudes are calculated from the threshold to about А （1 А=0.1 nm） of the photon energy. The photoionization cross sections of atomic nitrogen are obtained by using the close-coupling R-matrix method. In the calculation 19 states are included. The ionization energy of the atomic nitrogen and the photoionization cross sections agree well with the experimental results. Based on the R-matrix results of atomic nitrogen, the interference effects between two neighbouring nitrogen atoms are obtained. It is shown that the interference effects are considerable when electrons are ionized just above the threshold, even for the separations between the two atoms are larger than two times of the bond length of N2 molecules. Therefore, in hot and dense samples, effects caused by the coherent interference between the neighbours are expected to be observable for the total photoionization cross sections.

关键词： interference effect photoionization cross section nitrogen atom

Observation of interference effects in (e, 2e) Electron Momentum Spectroscopy of SF6

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Chinese Journal of Chemical Physics 2015年第5期28卷 -页

作者： Min-fu Zhao Xu Shan Jing Yang En-liang Wang Shan-shan Niu Xiang-jun Chen Hefei National Laboratory for Physical Sciences at the Microscale and Department of Modern Physics University of Science and Technology of China Hefei 230026 ChinaThe Center of Basic Laboratory West Anhui University Lu'an 237012 China Hefei National Laboratory for Physical Sciences at the Microscale and Department of Modern Physics University of Science and Technology of China Hefei 230026 China

Two-dimensional electron density map (2D map) of binding energy and relative azimuthal angle (i.e., momentum) for the outer-valence molecular orbitals of SF6 has been measured by a highly sensitive electron momentum spectrometer with noncoplanar symmetric geometry at the impact energy of 1.2 keV plus binding energy. The experimental electron momentum profiles for the relevant molecular orbitals have been extracted from the 2D map and interpreted on the basis of the quantitative calculations using the density functional theory with B3LYP hybrid functional. For the outermost F2p nonbonding orbitals of SF6, the interference patterns are clearly observed in the ratios of the electron momentum profiles of molecular orbitals to that of atomic F2p orbital.

关键词： (e, 2e) electron momentum spectroscopy interference effect Bond oscillation Electron momentum profile

Experimental Study on Vortex-Induced Vibration Coupling Wake interference of Multi-Riser Groups with Sensitive Spacing

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China Ocean Engineering 2022年第3期36卷 333-347页

作者： WANG Yu LI Peng LIU Yu CHEN Xin LOU Min GUO Hai-yan College of Architecture and Civil Engineering Shandong University of Science and TechnologyQingdao 266590China Shandong Provincial Key Laboratory of Civil Engineering Disaster Prevention and Mitigation Qingdao 266590China School of Petroleum Engineering China University of Petroleum(East China)Qingdao 266580China College of engineering Ocean University of ChinaQingdao 266100China

The“riser group−fluid between risers”is taken as the carrier,and the experiment on vortex-induced vibration of tandem riser groups coupling interference effect under sensitive spacing is *** least-square method is used to linearly fit the reduced velocity and main frequency,and the rule of Strouhal numbers is *** mode is separated based on the mode decomposition theory,and the mode conversion mechanism is also *** concept of“interference efficiency”is introduced to study the dynamic characteristics and response evolutions of different riser *** results show that the wake shielding effect widely exists in tandem riser groups,and the interference effect of midstream and downstream risers on their upstream risers is significantly lower than that of upstream risers on midstream and downstream *** trajectories of midstream and downstream risers lag behind their upstream risers due to multiple shadowing effects,the vibration frequency range of downstream riser is widened and the dominant frequency is extremely *** with the isolated riser,wake interference suppresses the vibration dis-placement of the midstream and downstream risers in the in-line direction,and enhances the displacement of upstream and midstream risers in the cross-flow *** interference effect of the fluid between risers at low velocities is stronger than that at higher velocities,and the cross-flow displacements of upstream risers are always in the interference enhancement *** is urgent to pay attention to the cross-flow displacement of upstream and midstream risers in tandem riser groups considering the safety design.

关键词： vortex-induced vibration interference effect multi-riser groups sensitive spacing tandem arrangement dynamic response