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Experimental Research of Surface Roughness Effects on Highly-Loaded Compressor Cascade Aerodynamics

Journal of Thermal Science 2014年第4期23卷 307-314页

作者： CHEN Shao-wen XU Hao WANG song-tao WANG Zhong-qi Energy Science and Engineering School Harbin Institute of Technology

Aircraft engines deteriorate during continuous operation under the action of external factors including fouling, corrosion, and abrasion. The increased surface roughness of compressor passage walls limits airflow and leads to flow loss. However, the partial increase of roughness may also restrain flow separation and reduce flow loss. It is necessary to explore methods that will lower compressor deterioration, thereby improving the overall performance. The experimental research on the effects of surface roughness on highly loaded compressor cascade aerodynamics has been conducted in a low-speed linear cascade wind tunnel. The different levels of roughness are arranged on the suction surface and pressure surface, respectively. Ink-trace flow visualization has been used to measure the flow field on the walls of cascades, and a five-hole probe has been traversed across one pitch at the outlet. By comparing the total pressure loss coefficient, the distributions of the secondary-flow speed vector, and flow fields of various cases, the effects of surface roughness on the aerodynamics of a highly loaded compressor cascade are analyzed and discussed. The results show that adding surface roughness on the suction surface and pressure surface make the loss decrease in most cases. Increasing the surface roughness on the suction surface causes reduced flow speed near the blade, which helps to decrease mixing loss at the cascades outlet. Meanwhile, adding surface roughness on the suction surface restrains flow separation, leading to less flow loss. Various levels of surface roughness mostly weaken the flow turning capacity to various degrees, except in specific cases.

关键词： Highly loaded compressor linear cascades surface roughness aerodynamic performance experimental research

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热辐射不对称条件下室内热环境的数值模拟

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科学技术与工程 2024年第9期24卷 3804-3812页

作者：赵晓丽胡松涛朱辉王刚韩立彬青岛理工大学环境与市政工程学院青岛266520

建筑内围护结构的热辐射不对称可能引起的室内温湿度分布异常,严重时甚至导致热舒适区的偏移。为精确预测热辐射不对称条件下室内热环境的变化特征,以海信空调公司的青岛厂区的环境实验室为研究对象,严格按照实验室的尺寸、布置进行全... 详细信息

建筑内围护结构的热辐射不对称可能引起的室内温湿度分布异常,严重时甚至导致热舒适区的偏移。为精确预测热辐射不对称条件下室内热环境的变化特征,以海信空调公司的青岛厂区的环境实验室为研究对象,严格按照实验室的尺寸、布置进行全尺寸建模,并且保留了空调器内部的流动和换热结构,从而保证模拟结果的精度。为了兼顾流动和传热问题过程中高雷诺转捩流和远场低雷诺流动,采用了SST k-ω湍流模型;采用多孔介质模型模拟空调器内部换热器;采用Coupled算法来实现快速迭代计算。为了验证模拟的精确度,进行了相同边界条件下的试验测量,获得实验室内210个测点的温度值和4个高度上的相对湿度,并计算得到室内气流的均匀度、垂直温差等关键参数。结果表明,空调送风量的模拟值与实测值的相对误差为7%,98%温度测点的相对误差在±5%以内。研究表明,通过全尺寸数值模拟可以得到精度较高的室内温度分布的模拟结果,精确预测非对称热辐射条件下室内热环境。

关键词：热辐射不对称数值模拟全尺寸建模温度相对湿度

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One-pot synthesis of Sb-Fe-carbon-fiber composites with in situ catalytic growth of carbon fibers

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International Journal of Minerals,Metallurgy and Materials 2012年第6期19卷 542-548页

作者： Jiart Xie Wen-tao song Gao-shao Cao Xin-bing Zhao Department of Materials Science and Engineering Zhejiang University Hangzhou 310027 China

A Sb-Fe-carbon-fiber （CF） composite was prepared by a chemical vapor deposition （CVD） method with in situ growth of CFs us- ing Sb203/Fe2O3 as the precursor and acetylene （C2H2） as the carbon source. The Sb-Fe-CF composite was characterized by X-ray diffraction （XRD）, field emission scanning electron microscopy （FESEM） and transmission electron microscopy （TEM）, and its electrochemical per- formance was investigated by galvanostatic charge-discharge cycling and electrochemical impedance spectroscopy. The Sb-Fe-CF composite shows a better cycling stability than the Sb-amorphous-carbon composite prepared by the same CVD method but using Sb2O3 as the precur- sor. Improvements in cycling stability of the Sb-Fe-CF composite can be attributed to the formation of three-dimensional network structure by CFs, which can connect Sb particles firmly. In addition, the CF layer can buffer the volume change effectively.

关键词： composite materials antimony alloys carbon fibers chemical vapor deposition catalytic growth network structures lithiumbatteries anodes

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Photocatalytic Aerobic Oxysulfonylation of Alkynes to Access β-Keto Sulfones Catalyzed by OVs-N-Nb_(2)O_(5)

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Chinese Journal of Chemistry 2022年第22期40卷 2618-2624页

作者： tao song Yinpan Zhang Chun Wang Yafei Li Yong Yang CAS Key Laboratory of Bio-based Materials Qingdao Institute of Bioenergy and Bioprocess TechnologyChinese Academy of SciencesShandong Energy InstituteQingdaoNewEnergyShandongLaboratoryQingdaoShandong266101China Schoolof Chemistry and Materials Science Nanjing Normal UniversityNanjingJiangsu 210023China

Herein,we report a novel heterogeneous photocatalyst for radical-mediated oxidative oxysulfonylation of alkynes toβ-keto sulfones under environmentally benign *** oxygen vacancy-rich semiconductor Nb2O5(labeled as OVs-N-Nb_(2)O_(5))could efficiently catalyze a wide range of alkynes,especially for those bearing electron-deficient substituents or internal alkynes,to their correspondingβ-keto sulfones in good to high yields with good tolerance of diverse functional groups under visible-light *** late-stage modification of steroidal compounds and synthesis of bioactive molecules were also achieved via this procedure,highlighting its potential for practical ***,the photocatalyst OVs-N-Nb_(2)O_(5) showed outstanding catalytic stability for successive recycles without appreciable loss in activity and *** critical role of oxygen vacancies on improving reaction activity and selectivity was clearly disclosed via control experiments and theoretical calculation.

关键词： Oxygen vacancies Semiconducts Photocatalysis Oxysulfonylation of alkynes β-Keto sulfones

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Road Friction Coefficient Estimation Based on BP Neural Network

Road Friction Coefficient Estimation Based on BP Neural Netw...

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第36届中国控制会议

作者： tao song Hongliang Zhou Haifeng Liu Automotive Electronics Engineering Center Harbin Institute of Technology Foundation and Interdisciplinary Science Research Institute Harbin Institute of Technology

ISBN: (纸本)9781538629185

In the development process of automotive chassis control system,it is difficult to estimate road parameters *** on vehicle force analysis and Dugoff tire model,the method of road friction coefficient estimation using BP neural network is proposed based on the motion states in the vehicle running ***,the simulation of road friction coefficient estimation method is carried out a high precision vehicle dynamics simulation software *** results show that the algorithm can estimate road friction coefficient well.

关键词： Road friction coefficient neural network vehicle dynamic simulation

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An image processing method for feature extraction and dynamic tracking of particle clusters in CFBs

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颗粒学报:英文版 2023年第6期77卷 1-13页

作者： Yue Guo Shangyi Yin Shibing Lu tao song Huijun Ge Ping Lu School of Energy and Mechanical Engineering Nanjing Normal UniversityNanjing210023China

A new image processing method based on the high-speed camera is proposed to identify,locate,and track *** instantaneous characteristic parameters of particle clusters in the riser of the circu-lating fluidized bed(CFB)can be acquired,such as solids holdup,vertical velocity,lateral displacement,aspect ratio and *** were carried out with glass bead particles,river sand particles and FCC *** time series of images of gas-solid flow in a CFB riser with a 100 mm x 25 mm cross-section and 3.2 m in length were obtained using high-speed *** k-means++clustering algorithm is utilized to identify the clusters,centroid is applied to locate the clusters,and the cross-correlation algorithm is employed to track the specific clusters and number them to get the instantaneous characteristic *** results illustrate that the shapes of clusters in the center area are closest to circle,moving upwards at a uniform speed,while the clusters in the side-wall area are mostly elongated or long chain-like,moving slowly *** the transition area,the clusters are more complex,moving upwards at a constant speed,and having large lateral *** results show that the image processing method used in this study is successful in acquiring the dynamic and structural parameters of the clusters simultaneously.

关键词： Circulating fluidized bed Clusters Image processing Dynamic tracking

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Immobilization of GO_(X) on PEG/fluoresence functionalized nanographene oxide to describe fluctuation of glucose level

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Journal of Materials Science & Technology 2023年第33期164卷 111-118页

作者： Wenhao Qian tao song Mao Ye Xiaoyu Huang Yongjun Li Bingjie Hao Department of Stomatology Shanghai Xuhui District Dental CenterShanghai 200032China Key Laboratory of Synthetic and Self-Assembly Chemistry for Organic Functional Molecules Shanghai Institute of Organic ChemistryUniversity of Chinese Academy of SciencesChinese Academy of SciencesShanghai 200032China

Enzyme,produced and worked in all living things,could work as macromolecular biological catalysts in diverse biochemical processes with particular specificity,like glucose oxidase(GOX).The efficient use of enzyme properties has great importance in pharmaceutics and *** this work,we could fabricate naive and effective electrochemical biosensors in the determination of glucose levels via utilizing *** oxide,as a water-soluble derivative of graphene,has shown great promise in a variety of biomedical applications including ***,we established a new-type special platform for GOX immobilization to perform its prosperities,in which nanographene oxide(nGO)was employed as an ideal base and poly(ethylene glycol)(PEG)was conjugated on the edge of nGO sheets to enhance its ***,preferable functional dyes(Rhodamine B/fluorescein isothiocyanate)were also introduced to the ***-nanocomposites were then provided by locating GOX on the platform,i.e.,GOX@nGO-PEG-RhB and GOX@*** microstructure and composite of platforms and enzyme-nanocomposites were confirmed by diverse ***,on account of corresponding cyclic voltammetric and typical ready-state amperometric curves,it was informed that GOX@nGO-PEG-RhB and GOX@nGO-PEG-FITC could effectively respond to the fluctuation of glucose level as electrochemical *** present work presents special platforms for the immobilization of enzymes like GOX and provides new-type biosensors in the detection of glucose levels.

关键词： Nanographene oxide GOX Fluorescence dye Sensor Glucose

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Vortex tuning of a submarine by Liutex force field model

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Journal of Hydrodynamics 2021年第3期33卷 503-509页

作者： Liu-shuai Cao song-tao Chen De-cheng Wan Yi-qian Wang Computational Marine Hydrodynamics Lab(CMHL) School of Naval ArchitectureOcean and Civil EngineeringShanghai Jiao Tong UniversityShanghai200240China Ocean College Zhejiang UniversityZhoushan316021China School of Mathematical Science Soochow UniversitySuzhou215006China

Vortical structures of a submarine with appendages are fully turbulent and ***,flow control and vortex manipulation are of great importance for the hydrodynamic performance and acoustic *** the generic submarine model DARPA Suboff as the test case,a vortex tuning method based on the Liutex force field is proposed to manipulate the vorticity *** flow past the submarine model in straight-line motion at a Reynolds number of 1.2×107 is achieved by solving the Reynolds averaged Navier-Stokes(RANS)***-block structured mesh topology is used to discretize the computational domain,and the shear stress transport(SST)k-ωturbulence model is implemented to close the *** control of vortex is achieved by introducing additional source terms based on Liutex vortex definition and identification system to the RANS *** resistance acting on the submarine,flow field as well as the vortical structures are compared and *** show that Liutex force model can effectively reduce the resistance by 9.31%and change the vortical structures apparently.

关键词： Vortex tuning vortical structures submarine vortex identification Liutex force field model

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Wall-modeled large eddy simulation for the flows around an axisymmetric body of revolution

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Journal of Hydrodynamics 2023年第2期35卷 199-209页

作者： song-tao Chen Lu-chun Yang Wei-wen Zhao De-cheng Wan Computational Marine Hydrodynamics Lab(CMHL) School of Naval ArchitectureOcean and Civil EngineeringShanghai Jiao Tong UniversityShanghai200240China Wuhan Second Ship Design and Research Institute Wuhan430205China

The flow around an axisymmetric body of revolution(DARPA SUBOFF bare model)at Re=1.2×10^(7)is numerically investigated using the wall-modeled large eddy simulation(WMLES).To evaluate the capabilities of WMLES in such wall-bounded turbulent flows,the effects of the wall stress model and sampling distance are systematically *** numerical results of the non-equilibrium wall stress model with an appropriate sampling distance are in good agreement with the experiments in terms of pressure coefficient,skin-friction coefficient,and drag *** this basis,the thickening of the turbulent boundary layer and the expansion of the wake can be clearly observed through flow visualization,especially using the Liutex vortex identification method.

关键词： Wall-modeled large eddy simulation(WMLES) axisymmetric body of revolution wall stress model sampling distance Liutex SUBOFF

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General closed-form inverse kinematics for arbitrary three-joint subproblems based on the product of exponential model

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Frontiers of Mechanical Engineering 2022年第2期17卷 85-101页

作者： tao song Bo PAN Guojun NIU Jiawen YAN Yili FU State Key Laboratory of Robotics and System Harbin Institute of TechnologyHarbin 150001China School of Mechanical Engineering and Automation Zhejiang Sci-Tech UniversityHangzhou 310018China

The inverse kinematics problems of robots are usually decomposed into several Paden–Kahan subproblems based on the product of exponential model. However, the simple combination of subproblems cannot solve all the inverse kinematics problems, and there is no common approach to solve arbitrary three-joint subproblems in an arbitrary postural relationship. The novel algebraic geometric (NAG) methods that obtain the general closed-form inverse kinematics for all types of three-joint subproblems are presented in this paper. The geometric and algebraic constraints are used as the conditions precedent to solve the inverse kinematics of three-joint subproblems. The NAG methods can be applied in the inverse kinematics of three-joint subproblems in an arbitrary postural relationship. The inverse kinematics simulations of all three-joint subproblems are implemented, and simulation results indicating that the inverse solutions are consistent with the given joint angles validate the general closed-form inverse kinematics. Huaque III minimally invasive surgical robot is used as the experimental platform for the simulation, and a master–slave tracking experiment is conducted to verify the NAG methods. The simulation result shows the inverse solutions and six sets given joint angles are consistent. Additionally, the mean and maximum of the master–slave tracking experiment for the closed-form solution are 0.1486 and 0.4777 mm, respectively, while the mean and maximum of the master–slave tracking experiment for the compensation method are 0.3188 and 0.6394 mm, respectively. The experiments results demonstrate that the closed-form solution is superior to the compensation method. The results verify the proposed general closed-form inverse kinematics based on the NAG methods.

关键词： inverse kinematics Paden-Kahan subproblems three-joint subproblems product of exponential closed-form solution

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