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Effect of the injection pressure and orifice diameter on the spray characteristics of biodiesel

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Journal of Traffic and Transportation Engineering(English Edition) 2020年第3期7卷 331-339页

作者： Limin Geng yanjuan wang Yueying wang Huimei Li Key Laboratory of Shaanxi Province for Development and Application of New Transportation Energy Chang'an UniversityXi'an 710064China Department Of Military Vehicle Academy Of Military TransportationTianjin 300161China

The purpose of this study was to analyze the influence of the injection pressure and orifice diameter on the spray characteristics of soybean *** macroscopic spray characteristics of the spray tip penetration(STP)and spray cone angle(SCA)were tested with a high-speed camera *** microscopic spray characteristics,such as the statistical size distribution,Sauter mean diameter(SMD),representative diameters and dispersion boundary,were obtained using a Malvern laser particle size analyzer(PSA).The test results showed that with an increasing injection pressure,the STP and the SCA of the biodiesel increased,but the curves of size-volume distribution and cumulative volume distribution of the atomized droplets shifted to smaller *** SMD and representative diameters decreased,and the dispersion boundary was ***,with a decreasing orifice diameter,longer STP and smaller SCA values were ***,the size distribution curves of the atomized biodiesel droplets shifted to smaller *** SMD and representative diameters were reduced,and the relative size range of the atomized biodiesel droplets was *** injection pressures and smaller orifice diameters improved the biodiesel atomization;however,the smaller orifice diameters caused an inhomogeneous size distribution of the atomized biodiesel droplets.

关键词： Biodiesel Injection pressure Orifice diameter Spray characteristics Size distribution

Performance Analysis of Cooling Wall of Supercritical CO_(2) Coal-Fired Plants

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Journal of Thermal Science 2022年第6期31卷 1881-1890页

作者： wang yanjuan YU Binhui GAO Shuo LIU Qibin XU Jinliang The Beijing Key Laboratory of Multiphase Flow and Heat Transfer North China Electric Power UniversityBeijing 102206China Institute of Engineering Thermophysics Chinese Academy of SciencesBeijing 100190China University of Chinese Academy of Sciences Beijing 100049China

Using supercritical CO_(2)(S-CO_(2)) instead of water steam as heat transfer fluid for coal-fired power plants is another way to further improve the power generation efficiency. In this paper, a multi-field coupling model that integrates fluid flow, heat transfer and thermal stress is proposed to solve the complex problem. The effects of the key operating parameters on the performances of the cooling wall are numerically investigated. More details of the characteristics of fluid dynamics, thermal stress, pressure drop, coupled heat transfer and the whole flow and temperature fields in the S-CO_(2) cooling wall are revealed and discussed. A comparison study is made between the cooling wall tube and waterwall tube. Both temperature and thermal deformations of cooling wall tube are much higher than that of water. Numerical simulation results indicate that inclination angle has little effects on the temperature distribution, while increase of pressure drop is obvious as the inclination angle increases. Increasing tube diameter can effectively reduce both the pressure drop and the temperature of the cooling wall tube. As a result, a new insight is introduced for the design of S-CO_(2) power cycle.

关键词： supercritical CO_(2) cooling wall coal-fired power plant heat transfer

A New Structure of Cooling Wall Tube for Supercritical CO_(2)Coal-Fired Power Plants

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Journal of Thermal Science 2023年第3期32卷 1239-1250页

作者： wang yanjuan GAO Shuo JIANG Qiongqiong LI Yi LIU Qibin XU Jinliang The Beijing Key Laboratory of Multiphase Flow and Heat Transfer North China Electric Power UniversityBeijing 102206China Institute of Engineering Thermophysics Chinese Academy of SciencesBeijing 100190China University of Chinese Academy of Sciences Beijing 100049China

In terms of developing supercritical CO_(2)(sCO_(2))coal-fired power plants,enhancing cooling wall performance is one of significant factors to improve system *** this paper,a new cooling wall tube structure is proposed to match the non-uniform heat flux(NUH)with the thermal resistance by changing the cooling wall tube eccentricity.A three-dimensional multi-physical coupling model of cooling wall is constructed to compare the novel structure to the conventional *** properties of fluid dynamics,thermal stress,coupled heat transfer and cooling wall deformation are *** contrast to the traditional structure,the maximum temperature and circumferential temperature difference(CTD)of the proposed structure can be reduced by 2%and 27.4%,*** essential working parameters related to the performances of the cooling wall tube are *** maximum temperature of the new structure is reduced by 8-13 K and the maximum thermal stress is reduced by about 10%-15%under all the simulated working conditions when the eccentricity changes from 0 to *** proposed structure can effectively reduce the maximum temperature and circumferential temperature gradient under ***,a novel insight is put out for the design and optimization of the cooling wall tube in coal-fired power plants.

关键词： supercritical carbon dioxide cooling wall tube thermal-hydraulic structural coupling supereritical heat transfer

Maintenance of Earth-Moon halo orbit 36

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Maintenance of Earth-Moon halo orbit

Taipingite-(Ce),(Ce73+,Ca2)∑9Mg(SiO4)3[SiO3(OH)]4F3,a new mineral from the Taipingzhen REE deposit,North Qinling Orogen,central China

第36届中国控制会议

作者： Lei Liu Chunyang Hu Mei wang yanjuan wang Beijing Aerospace Control Center College of Science National University of Defense Technology School of Economics Nankai University

ISBN: (纸本)9781538629185

Halo orbit nearby the Earth-Moon libration points is valuable to explore the lunar farside,which however must frequently be controlled to stay in the vicinity of libration points because of *** a consideration of the high fidelity force models,this paper focuses on maintenance of halo orbit nearby the Earth-Moon libration ***,based on the dynamic characteristic of libration orbit in the circular restricted three-body problem(CRTBP),the mathematic model and control strategy of maintenance are studied.A control method named circling-continuation is put forward including the Halo-style and Lissajous-style ***,with the solar radiation pressure and third-body perturbation considered,maintenance of halo orbit nearby the Earth-Moon L2 point is investigated on the control interval and velocity ***,the maintenance costs and efficiencies of two control styles are *** results show that the Lissajous-style way is suitable for the halo orbit maintenance with a control interval about 7.4 days and a velocity increment less than 20m/*** circling-continuation method has been successfully applied to the Chinese CHANG’E-2 and CHANG’E-5T1 extended mission nearby the Sun-Earth/Moon and Earth-Moon L2 libration points,which has been proved to be efficient and fuel-saving and suitable to the future lunar and deep space exploration.

关键词： Orbit maintenance halo orbit Libration point Earth-Moon system Lunar exploration

来源： cnki会议评论

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cnki会议

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Geoscience Frontiers 2020年第6期11卷 2339-2346页

作者： Kai Qu Xianzhang Sima Guang Fan Guowu Li Ganfu Shen Huakai Chen Xing Liu Qingqing Yin Ting Li yanjuan wang Tianjin Center China Geological SurveyTianjin 300170China Beijing Research Institute of Uranium Geology Beijing 100029China China University of Geosciences(Beijing) Beijing 100083China Chengdu Center China Geological SurveyChengdu 610081China Henan Nuclear Geological Bureau Zhengzhou 450044China

A new cerite group mineral species,taipingite-(Ce),ideally(Ce7^3+,Ca2)∑9Mg(SiO4)3[SiO3(OH)]4 F3,has been found in the Taipingzhen rare earth element(REE)deposit in the North Qinling Orogen(NQO),Central *** forms subhedral grains(up to approximately 100 μm×200 μm)commonly intergrown with the REE mineral assemblages and is closely associated with allanite-(Ce),gatelite-(Ce),tornebohmite-(Ce),fluocerite-(Ce),fluocerite-(La),fluorite,bastnasite-(Ce),parisite-(Ce)and ***-(Ce)is light red to pinkish brown under a binocular microscope and pale brown to colorless in thin section,and it is translucent to transparent with a grayish-white streak and vitreous *** mineral is brittle with conchoidal fracture;has a Mohs hardness value of approximately 51/2 and exhibits no cleavage twinning or *** calculated density is 4.900(5)g/***,taipingite-(Ce)is uniaxial(+),withω=1.808(5),ε=1.812(7),c=ε,and a=b=ω.Furthermore,this mineral is insoluble in HCl,HNO3 and H2 *** microprobe analysis demonstrated that the sample was relatively pure,yielding the empirical formula(with calculated H2 O):(Ce4.02La1.64Nd1.49Pr0.41Sm0.10Gd0.02Ho0.02Tm0.01Lu0.02Y0.03Ca0.66Mg0.05Th(0.01-0.51∑9(Mg0.75Fe0.253+)∑1(SiO4)3{[SiO3(OH)]3.98[PO3(OH)]0.02}∑4(F1.81OH1.17Cl0.02∑***-(Ce)is trigonal and exhibits space group symmetry R3 c with unit cell parameters a=10.7246(3)Å,c=37.9528(14)Å,V=3780.39(20)Å3 and Z=*** strongest eight lines in the X-ray diffraction pattern are[d in A(I)(hkl)]:4.518(50)(202),3.455(95)(122),3.297(85)(214),3.098(35)(300),2.941(100)(02,10),2.683(65)(220),1.945(40)(238)and 1.754(40)(30,18).The crystal structure has been refined to a R1 factor of 0.025,calculated for the 2312 unique observed reflections(Fo≥4σ).The mineral is named after its discovery locality and is characterized as the F-dominant analogue of cerite-(Ce).

关键词： Taipingite-(Ce) Cerite group New mineral species Chemical composition Crystal structure North Qinling Orogen

COMPETITION BUILDS STRENGTH IN FINANCIAL MARKETS

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Beijing Review 2007年第20期50卷 12-13页

作者： wang yanjuan and Chen Wen

Transitioning from a“planned”economy to a“market”economy may be a long and arduous task for China,but opening its financial markets to foreign competition will help build stability and strength for the Chinese economy, says *** Alan ***,who was recently named as Special Envoy for China and for the Strategic Economic Dialogue,answered written questions by Beijing Review on his views of the economic relationship between China and the United States and the reforms he sees as vital to a good bilateral relationship.

关键词： COMPETITION BUILDS STRENGTH IN FINANCIAL MARKETS

Playing With the Artistry of Language

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Beijing Review 2008年第3期51卷 44-45页

作者： wang yanjuan & CHEN WEN

Contemporary artist Xu Bing returns to Beijing to become vice president of the Central Academy of Fine

关键词：阴刀

Political Fallout in Japan

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Beijing Review 2007年第15期50卷 14-15页

作者： wang yanjuan and Chen Wen

Japanese Defense Minister Fumio Kyuma resigned in early July after making controversial remarks about the U.S. atomic bombings during World War II. While speaking at a Chiba Prefecture university on June 30, Kyuma said that those bombings ended the war, and that “it could not be helped.” His remarks drew criticism from the Japanese, especially those who survived the two atomic bomb attacks on Hiroshima and Nagasaki. After Kyuma resigned, Japanese Prime Minister Shinzo Abe’s administration appointed Yuriko Koike, the country’s national security adviser, as Japan’s first female defense minister. Beijing Review talked with foreign affairs experts in China and the United States about whether Kyuma’s remarks will put a damper on U.S.-Japanese relations.

关键词： II Political Fallout in Japan World

GLOBAL TRADE CONUNDRUM

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Beijing Review 2007年第20期50卷 10-11页

作者： wang yanjuan and Chen Wen

Washington's recent actions against China over trade disputes and Beijing's strong reactions to those measures have heightened fears that mounting friction over bilateral trade will *** is now"urgent"to get the *** relationship correct,said Stephen Roach,newly appointed Chairman of Morgan Stanley ***,who for the past 16 years served as Morgan Stanley's chief economist,predicts a more broad-based consumer led growth in China in the next five *** is also convinced that serious initiatives to be undertaken by the *** to penalize Chinese products as they are sold in the United States will be a big *** Review spoke to him about these and other aspects of *** and China's new economic growth model.

关键词： GLOBAL TRADE CONUNDRUM