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Radiation transmission simulation for volumetric solar receiver by Monte Carlo method

Huagong Xuebao/CIESC Journal 2011年第SUPPL. 1期62卷 60-65页

作者： Cui, Fuqing He, Yaling Cheng, Zedong Li, Dong Tao, Yubing State Key Laboratory of Multiphase Flow in Power Engineering School of Energy and Power Engineering Xi'an Jiaotong University Xi'an 710049 Shaanxi China

The optical model of the volumetric solar receiver has been built and corresponding solar radiation propagation process within the receiver is simulated by the Monte Carlo ray tracing method(MCRT). In the computation, the complicated photon transmission process in the SiC porous absorber is simplified as the transmission process in the statistically homogeneous and isotropic turbid media. Meanwhile, the non-uniform cylindrical coordinate grid is applied in the statistics of the absorbing energy distributions, which could reduce much computation effort compared with normal uniform grid. Based on the above model, the energy distribution of irregular macro scale porous absorber is counted. The results show that, under the given working condition, the radiation heat flux is concentrated at the top area of absorber and the maximum heat flux value is up to 2.87 × 109 W· m-3, but it decreases quickly in the sideward area. The heat flux distribution of whole porous absorber exhibits a great non-uniform characteristic, which would affect the stability and safety of receiver. © All Rights Reserved.

关键词： Monte Carlo methods

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Supersonic Ejector to Boost Production from Low Pressure Natural Gas Field

Supersonic Ejector to Boost Production from Low Pressure Nat...

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International Conference on Computer Distributed Control and Intelligent Environmental Monitoring (CDCIEM)

作者： Gesheng Wu Daotong Chong Weixiong Chen Junjie Yan State Key Laboratory of Oil & Gas Reservoir Geology and Exploitation Southwest Petroleum University Chendu China State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an China

An effective way to boost natural gas production from low pressure gas field was introduced in the paper. The supersonic ejector used the energy of high pressure gas wells, which was generally wasted through the choke valve, as its power supply to boost the low pressure gas production. The field experiment of the natural gas ejector was carried out, and the performance of the ejector was also presented. Moreover, the production of low pressure natural gas well was compared when the natural gas ejector was used or not. The economic analysis shows that the recovery period of the capital was less than several months.

关键词： Monitoring Computers Distributed control

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Stress analysis of heat exchange tube with inner and outer fins under convection heat transfer conditions

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Huagong Xuebao/CIESC Journal 2011年第SUPPL. 1期62卷 86-91页

作者： Ji, Yanpeng Ma, Ting Zeng, Min Wang, Qiuwang State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an 710049 Shaanxi China

The heat exchange tube with inner and outer fins has been widely applied in industry in order to enhance the performance of heat exchangers. When it is used in high temperature environment, the security must be considered. A three-dimension model was established to simulate the thermal stress by software ANSYS. The results indicated that the main factor, which had effect on the stress and deformation, was temperature and the maximum stress occurred at the joint location between inner fins and tubes. The inner pressure distribution of tube could enhance the effect of stress. On the contrary, the outer could weaken the effect. © All Rights Reserved.

关键词： Finite element method

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Experimental study of natural convection in horizontally-positioned open-celled metal foams

Experimental study of natural convection in horizontally-pos...

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International Conference on Materials for Renewable Energy and Environment

作者： Z. G. XU Z. G. QU C. Y. ZHAO State Key Laboratory of Multiphase Flow School of Energy and Power Engineering Xi'an Jiaotong University

ISBN: (纸本)9781612847498

Experimental study of air natural convection in horizontally-positioned copper metallic foams with open cells was conducted. Temperature distributions on the heating surface were tested under different heating power for foam samples having different porosities and pore densities. The effects of porosity and pore density on the total thermal resistance of the foam sample were quantified. It is found that the porous surface can enhance the natural convection and reduce the thermal resistance by about 20% in comparison with a smooth surface. The surface area density and mass flow rate in natural convection are affected by porosity and pore density simultaneously. When the porosity is relative small (ε = 90%), there exits a critical value of the Gr number (turning point) for two pore densities (10ppi and 40ppi). When the Gr number is less than this critical value, the foam with a higher pore density has the lower total thermal resistance, whereas when the Gr number exceeds the turning point value, the opposite holds. If the porosity is increased to ε = 95%, the foam with a higher pore density has the lower thermal resistance in the whole experimental range. When the porosity and pore density is the same, the foam with smaller size has the higher thermal resistance in the whole experimental range. If the size is relatively small (100×100×50mm), for the two pore densities studied (20ppi and 80ppi), there exits a critical value of the Gr number (turning point). The foam with a lower porosity (ε = 90%) has the lower thermal resistance and the decrease is more obvious for the case of 80ppi. If the size is relatively big(100×100×80mm), there exists a critical value of the Gr number (turning point) only for the case of 10ppi. When the Gr number is less than this critical value, the foam with a higher porosity (ε = 95%) has the higher total thermal resistance, the opposite holds. While for the other two pore densities (20ppi and 40ppi), there is no turning point. The foam with

关键词： Metal foam Natural convection Porosity Pore density Thermal resistance

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Single electron loss in the collisions of C^(3+) and atomic hydrogen

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Chinese Physics B 2010年第9期19卷 344-348页

作者：刘会平欧阳晓平胡华四苏光辉 State Key Laboratory of Multiphase Flow in Power Engineering Department of Nuclear Science and TechnologyXi'anjiaotong University

This paper studies the projectile electron loss cross sections of C^3＋ colliding with atomic hydrogen in the frame work of extended over-barrier model at intermediate velocities （25 keV/u-600 keV/u）. The electron loss is calculated in terms of the interaction between the screened target nucleus and the active projectile electron and of the interaction between projectile electron and target electron. Compared with the convergent close-coupling calculations, screening and anti-screening calculations, this model satisfactorily reproduces the experimentally obtained energy dependence of the electron-impact ionisation cross sections and the single electron loss cross sections over the energy range investigated here.

关键词： single electron loss over-barrier model

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Measurement of laminar burning velocities of iso-butanol-air mixtures

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Chinese Science Bulletin 2010年第19期55卷 2046-2056页

作者： FENG PengFei GU XiaoLei HUANG ZuoHua State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an 710049 China

The laminar burning velocity of iso-butanol-air mixtures was measured under different initial pressures,initial temperatures and equivalence ratios using high-speed schlieren photography and outwardly propagation flame in a constant volume combustion *** on the analysis of stretched flame propagation speed and stretch rate,the laminar burning velocities and Markstein lengths of iso-butanol-air flames are *** accordance,with photos of flame,an analysis of flame stability and the influencing factors is carried *** results show that the laminar burning velocity is decreased with the increase of initial pressure and is increased with the increase of initial *** maximum value of laminar burning velocity is presented at the equivalence ratio of *** Markstein length is decreased with the increase of equivalence *** specified equivalence ratio,the Markstein length is decreased with the increase of initial temperature and initial ***,the flame instability is increased with the increase of equivalence ratio,initial temperature and initial pressure.

关键词：层流燃烧速度空气混合物速度测定异丁醇火焰传播速度初始压力初始温度当量比

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Flame instability analysis of diethyl ether-air premixed mixtures at elevated pressures

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Chinese Science Bulletin 2010年第3期55卷 314-320页

作者： ZHANG Ni DI YaGe HUANG ZuoHua ZHANG ZhiYuan State Key Laboratory of Multiphase Flow in Power Engineering Xi 'an Jiaotong University Xi 'an 710049 China

Combustion characteristics of premixed diethyl ether-air mixtures were studied at different equivalence ratios and elevated initial pressures using schlieren photography and spherically propagating flame. Laminar burning velocities, Markstein number and critical radii at onset of cellular structure were obtained. The results show that an increase in initial pressure leads to a decrease in the unstretched laminar burning velocities. Laminar burning velocities give their peak values at the equivalence ratio of 1.1. Markstein number decrease with the increase of initial pressure and equivalence ratio, indicating that the instability of flame front is increased with the increase of initial pressure and equivalence ratio. The critical radii at onset of cellular flame structure are decreased with the increase of initial pressure.

关键词：不稳定性分析空气混合物火焰结构压力升高乙醚层流燃烧速度初始压力预混

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Theoretical investigation on water/metal fuel ramjet motor-thermodynamic cycle and thermodynamic calculation

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航空动力学报 2010年第5期25卷 1129-1138页

作者： YANG Ya-jing HE Mao-gang School of Aerospace Xi'an Jiaotong UniversityXi'an 710049China State Key Laboratory of Multiphase Flow in Power Engineering School of Energy and Power EngineeringXi'an Jiaotong UniversityXi'an 710049China

For achieving high-speed requirement of underwater vehicle,a conceptual engine,which utilizes the hydroreactive characteristic of several metals under supercavitation environment,has been put forward. Especially,in order to obtain specific impulse as great as possible,a dual water injection system is taken into account. Then thermodynamic cycle model,which lead the improvement of power plant and energy system,is introduced in detail,and thermal efficiency is also analyzed. Furthermore,for investigating the performance of this kind of engine system,detailed thermodynamic calculation and analysis are achieved. Especially,regarding hydroreactive metal fuel Mg/AP/HTPB as our target fuel-rich propellant,considering its obvious deficient oxygen property and the energy property of magnesium/water reaction,theoretical calculation method is established by integrating chemical non-equilibrium with chemical equilibrium. Accordingly,low limit of primary water/fuel ratio is determined. In addition,the qualitative and quantitative relationship of performance parameters,such as theoretical specific impulse,nozzle exit temperature,characteristic velocity,etc.,versus water/fuel ratio is investigated respectively.

关键词： hydroreactive metal fuel water ramjet thermodynamic cycle thermal efficiency specific impulse

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Investigation of the transfer ionization process in collisions of partially stripped ions on He

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Chinese Physics B 2010年第6期19卷 277-282页

作者：刘会平陈熙萌欧阳晓平席发元苏光辉 State Key Laboratory of Multiphase Flow in Power Engineering Department of Nuclear Science and TechnologyXi'an Jiaotong University School of Nuclear Science and Technology Lanzhou University

In this paper a projectile ion-recoil ion coincidence technique is used to investigate the transfer ionization processes in collisions of 0.22-6.30 MeV Cq＋ ions and 0.25-6.35 MeV 0q＋ ions （q=1, 2, 3, 4） with the He atom separately. The cross section ratio f of transfer ionization to single electron transfer is measured, and the dependence of f on both charge state q and energy E of the projectiles is investigated. The electron-structure and the mechanisms leading to transfer ionization affect the dependence of f on q and E. Our measurements, along with other data published previously, suggest a similar dependence of f on charge state and energy of projectile for partially stripped ions over a large energy range. The maximum value of f is approximately 0.17q^0.60; the energy corresponding to maximum f is about 160q^0.60 keV/u.

关键词： ion atom collision transfer ionization single electron transfer

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Experimental investigations on combustion characteristics of syngas composed of CH_(4),CO,and H_(2)

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Frontiers of Chemical Science and engineering 2010年第4期4卷 404-410页

作者： Qingwei FAN Shien HUI Qulan ZHOU Qinxin ZHAO Tongmo XU State Key Laboratory of Multiphase Flow in Power Engineering Xi’an Jiaotong UniversityXi’an 710049China

The residual gas and remained raw gas in dual gas resources polygeneration system are quite complex in components(mainly CH_(4),CO,and H_(2)),and these results to the distinguished differences in combustion *** investigations on basic combustion characteristics of syngas referred above are conducted on a laboratory-scale combustor with flame temperature and flue gas composition measured and *** air coefficient(PA),total air coefficient(TA),and components of the syngas(CS)are selected as key factors,and it is found that PA dominates mostly the ignition of syngas and NOx formation,while TA affects the flue gas temperature after high temperature region and NOx formation trend to be positive as H_(2)/CO components *** results provide references for industrial utilization.

关键词： dual gas resources polygeneration lean premixed combustion residual gas remained raw gas NOx emission

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