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Numerical Investigation of Inlet Distortion on an Axial Flow Compressor Rotor with Circumferential Groove Casing Treatment

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Chinese Journal of Aeronautics 2008年第6期21卷 496-505页

作者： huang Jian wu Hu School of Power and Energy Northwestern Polytechnieal University Xi' an 710072 China

On the base of an assumed steady inlet circumferential total pressure distortion, three-dimensional time-dependent numerical simulations are conducted on an axial flow subsonic compressor rotor. The performances and flow fields of a compressor rotor, either casing treated or untreated, are investigated in detail either with or without inlet pressure distortion. Results show that the circumferential groove casing treatment can expand the operating range of the compressor rotor either with or without inlet pressure distortion at the expense of a drop in peak isentropic efficiency. The casing treatment is capable of weakening or even removing the tip leakage vortex effectively either with or without inlet distortion. In clean inlet circumstances, the enhancement and forward movement of tip leakage vortex cause the untreated compressor rotor to stall. By contrast, with circumferential groove casing, the serious flow separation on the suction surface leads to aerodynamic stalling eventually. In the presence of inlet pressure distortion, the blade loading changes from passage to passage as the distorted inflow sector is traversed. Similar to the clean inlet circumstances, with a smooth wall casing, the enhancement and forward movement of tip leakage vortex are still the main factors which lead to the compressor rotor stalling eventually. When the rotor works trader near stall conditions, the blockage resulting from the tip leakage vortex in all the passages is very serious. Especially in several passages, flow-spillage is observed. Compared to the clean inlet circumstances, circumferential groove casing treatment can also eliminate the low energy zone in the outer end wall region effectively.

关键词： axial flow compressor inlet distortion casing treatment aerodynamic stability numerical simulation

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Control of vortex-induced vibrations of the cylinder by using split-ter plates immersed in the cylinder wake at low Reynolds number

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Journal of Hydrodynamics 2020年第5期32卷 942-952页

作者： Zhi-qiang Xin Zhi-huang wu Chui-jie wu Dan huang The College of Mechanics and Materials HoHai UniversityNanjing 211100China State Key Laboratory of Structural Analysis for Industrial Equipment and School of Aeronautics and Astronautics Dalian University of TechnologyDalianChina

The vortex-induced vibrations of a cylinder with two plates symmetrically distributed along the centerline of the wake are studied by using the fluid-structure interaction simulations on the Arbitrary Lagrangian-Eulerian *** this study,the different geo-metrical distribution parameters of the splitter plates and inflow velocities are taken into *** physical mechanisms of vortex-induced vibration of the cylinder with symmetrical plates are revealed from the cylinder amplitude,hydrodynamic force characteristics,vortex shedding frequency,and flow pattern *** results show that the dynamic interaction between the vortex shed from the oscillation cylinder and plates is responsible for the wake stabilization mechanism,and the stable wake and the dynamic response reduction of the main cylinder can be achieved at a wide range of reduced velocities by placing sym-metrical sheets at suitable locations.

关键词： Cylinder vortex-induced vibrations splitter plates vibration control flow pattern

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A ROOT-based detector test system

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Nuclear Science and Techniques 2021年第10期32卷 50-58页

作者： huang-Kai wu Chen Li Shanghai Institute of Applied Physics Chinese Academy of SciencesShanghai 201800China University of Chinese Academy of Sciences Beijing 100049China Shanghai Synchrotron Radiation Facilitiy Zhangjiang LaboratoryShanghai Advanced Research InstituteShanghai 201204China

Most detectors for nuclear physics experiments are detector arrays composed of numerous *** each detector unit is a major part of the research work on detector *** save time and simplify the research process,a ROOT-based detector test system was designed for detector unit *** test system is a general pur-pose and expandable software system that can support most of the hardware devices in the *** can easily build a complete detector test system using the required hardware *** software is based on the ROOT framework and is operated on the Linux *** software of the test system consists of four parts:the controller,data acquisition(DAQ),high-voltage power supply,and online monitoring and *** addition,a user-friendly graphical user interface(GUI)was designed for user ***,the online analysis func-tion of the software can implement automatic peak searching and spectrum fitting for different radioactive sources,and the results under different conditions can be shown *** completion of the test system could greatly simplify the development process of the detector.

关键词： Detector test Data analysis ROOT

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Excitation of Light-Induced Acoustic Waves in Doped Lithium Niobate Crystals

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Journal of Rare Earths 2006年第z1期24卷 264-268页

作者： huang Wei wu Zhongkang Department of Basic Beijing Institute of Civil Engineering and Architecture Beijing 100044 China Department of Physic Nankai University Tianjin 300071 China

The phenomena of acoustic emission in doped lithium niobate crystals were observed in the process of light-induced quasi-breakdown. It is found that the ultrasonic waves introduce into the crystal have been modulated by the low frequency acoustic waves. Its frequency increases with the rise of the intensity of incident light and its jump period of breakdown is the same as that of the photovoltaic current Ic, the change of light-induced refractive index Δn and the diffracted light intensity L. This effect was explained with the interaction of the three waves and resonant state theory. The experimental results and the theoretical analysis are in conformity.

关键词： photovoltaic current space charge wave light induced quasi-breakdown light induced acoustic effect

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Studies Directed toward Synthesis of the Structure Proposed for Stereocalpin A

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Chinese Journal of Chemistry 2011年第6期29卷 1185-1191页

作者： huang, Yixian wu, Yikang State Key Laboratory of Bioorganic and Natural Products Chemistry Shanghai Institute of Organic Chemistry Chinese Academy of Sciences Shanghai 200032 China

Some synthetic efforts directed to the proposed structure of stereocalpin A are disclosed. The stereogenic centers in the aldol unit were installed using the method of Evans and the intermediates obtained through a reliable route helped to reveal that the spectroscopic data reported earlier in the literature for the same structures were either erroneous or irrelevant.

关键词： peptide natural product aldol reaction amino acid condensation

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INTELLIGENT CONTROL SYSTEM OF PULSED MAG WELDING INVERTER BASED ON DIGITAL SIGNAL PROCESSOR

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Chinese Journal of Mechanical Engineering 2008年第6期21卷 86-90页

作者： wu Kaiyuan huang Shisheng wu Shuifeng LI Xinglin School of Mechanical Engineering South China University of Technology Guangzhou 510640 China

A fuzzy logic intelligent control system of pulsed MAG welding inverter based on digital signal processor （DSP） is proposed to obtain the consistency of arc length in pulsed MAG welding. The proposed control system combines the merits of intelligent control with DSP digital control. The fuzzy logic intelligent control system designed is a typical two-input-single-output structure, and regards the error and the change in error of peak arc voltage as two inputs and the background time as single output. The fuzzy logic intelligent control system is realized in a look-up table （LUT） method by using MATLAB based fuzzy logic toolbox, and the implement of LUT method based on DSP is also discussed. The pulsed MAG welding experimental results demonstrate that the developed fuzzy logic intelligent control system based on DSP has strong arc length controlling ability to accomplish the stable pulsed MAG welding process and controls pulsed MAG welding inverter digitally and intelligently.

关键词： Pulsed MAG welding inverter Arc length control Fuzzy logic intelligent control Digital signal processor (DSP)

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Large Number,Dark Matter,Dark Energy,and Superstructures in the Universe

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Communications in Theoretical Physics 2009年第3期51卷 575-576页

作者： huang wu-Liang huang Xiao-Dong Institute of High Energy Physics Chinese Academy of Sciences P.O. Box 918（3） Beijing 100049 China Department of Mathematics University of California Los Angeles Los Angeles CA 90095 U.S.A.

Since there may exist dark matter particles ν and δ with mass - 10^-1 e V in the universe, the superstructures with a scale of 10^19 solar masses （large number A - 10^19） appeared during the era near and before the hydrogen recombination. Since there are superstructures in the universe, there may be no necessity for the existence of dark energy. For checking the superstructure in the universe by CMB anisotropy, we need to measure CMB angular power spectrum especially around ten degrees across the sky- in more details, While neutrino u is related to electroweak unification, the fourth stable elementary particle 6 may be related to strong-gravity unification, which suggests p ＋ p^- → n ＋ δ^- and that some new baryons appeared in the TeV region.

关键词： large number dark matter dark energy stable elementary particle superstructure

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Design of multi-band frequency selective surfaces using multi-periodicity combined elements

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Journal of Systems Engineering and Electronics 2009年第4期20卷 675-680页

作者： Lu Mingyun huang Minjie wu Zhe School of Aeronautic Science and Technology Beihang Univ. Beijing 100191 P. R. China

Traditional multi-band frequency selective surface （FSS） approaches are hard to achieve a perfect resonance response in a wide band due to the limit of the onset grating lobe frequency determined by the array. To solve this problem, an approach of combining elements in different period to build a hybrid array is presented. The results of series of numerical simulation show that multi-periodicity combined element FSS, which are designed using this approach, usually have much weaker grating lobes than the traditional FSS. Furthermore, their frequency response can be well predicted through the properties of their member element FSS. A prediction method for estimating the degree of expected grating lobe energy loss in designing multi-band FSS using this approach is provided.

关键词： frequency selective surface multi-band grating lobe multi-periodicity combined element

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Solving multi-object radar cross section based on wide-angle parabolic equation method

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Journal of Systems Engineering and Electronics 2006年第4期17卷 722-724页

作者： huang Zhixiang wu Qiong wu Xianliang The Key Lab of Ministry of Education of Intelligent Computing & Signal Processing Anhui Univ. Hefei 230039 P. R. China

Based on a Pade approximation, a wide-angle parabolic equation method is introduced for computing the multiobject radar cross section （RCS） for the first time. The method is a paraxial version of the scalar wave equation, which solves the field by marching them along the paraxial direction. Numerical results show that a single wide-angle parabofic equation run can compute multi-object RCS efficiently for angles up to 45 ° . The method provides anew and efficient numerical method for computation electromagnetics.

关键词： parabolic equation method Pade approximation radar cross section paraxial direction.

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Novel Localized Excitations of Nonlinear Coupled Scalar Fields

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Communications in Theoretical Physics 2008年第6期49卷 1365-1372页

作者： LI Jin-Hua wu huang-Jiao Department of Physics and Center of Nonlinear Science Ningbo University Ningbo 315211 China

Some extended solution mapping relations of the nonlinear coupled scalar field and the well-known φ^4 model are presented. Simultaneously, inspired by the new solutions of the famous φ^4 model recently proposed by Jia, huang and Lou, five kinds of new localized excitations of the nonlinear coupled scaiar field （NCSF） system are obtained.

关键词： nonlinear coupled scalar field solitary wave structure mapping and deformation approach

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