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9th International Conference on power engineering, ICOPE 2009

作者： Liu, Ruwei Zhou, Qulan Hui, Shien Zhao, Qinxin Fan, Qingwei Xu, Tongmo Yu, Zhanying State Key Laboratory of Power Engineering Multiphase Flow Department of Energy and Power Engineering Xi'an Jiaotong University Xi'an Shaan xi710049 China

The experimental study was carried out on the air-staged combustion of different coal in a 1 MW W-shaped furnace. The combustion process occurred in two zones: the pre-stage combustion zone and the primary combustion zone. A variable SR was introduced to represent the air stoichiometric ratio in the pre-stage combustion zone. It is found that as SR decreases in the test range, the flame penetration depth is lengthened, and the temperature at the exit of the furnace decreases. Meanwhile, the maximum temperature in the central of the furnace first increases and then decreases, whereas the combustible loss and nitrogen oxides (NOx) emissions first decrease and then increase. The value of SR corresponding to the optimal combustion performance is 0.67 for lean coal and 0.65 for anthracite. Besides, it is also indicated that the effects of air-staging method are more significant on the lean coal than that on the anthracite.

关键词： Furnaces

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Performance of a domestic refrigerator using R600a/nano-TiO2 as working fluid

Performance of a domestic refrigerator using R600a/nano-TiO2...

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4th Asian Conference on Refrigeration and Air-Conditioning, ACRA 2009

作者： Bi, Shengshan Guo, Kai Liu, Zhigang Wu, Jiangtao State Key Laboratory of Multiphase Flow in Power Engineering Xi'An Jiaotong University Xi'an Shaanxi 710049 China

ISBN: (纸本)9868509610

In this work, an experimental work was investigated on the nano-refrigerant. A domestic R600a refrigerator was selected and instrumented with 19 resistance thermometers and three pressure transducers. R600a/TiO 2 nano-refrigerants were used as working fluid without any system reconstruction. The refrigerator performance was then investigated using energy consumption test and freeze capacity test. The results indicate that R600a/TiO2 nano-refrigerant works normally and safely in the refrigerator. The refrigerator performance was better than the pure R600a system, with 9.6% less energy used with 0.5 g/L nano-refrigerant. Thus, using R600a/ TiO2 nano-refrigerant in domestic refrigerators is feasible.

关键词： Refrigerators

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Mitigating check valve slamming and subsequentwater hammer events for PPFS using MOC

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Nuclear Science and Techniques 2009年第2期20卷 118-123页

作者： TIAN Wenxi SU Guanghui WANG Gaopeng QIU Suizheng XIAO Zejun State Key Laboratory of Multiphase Flow in Power Engineering Department of Nuclear Science and TechnologyXi＇an Jiaotong University Xi＇an 710049 China National Key Laboratory of Bubble Physics ＆ Natural Circulation Nuclear Power Institute of China Chengdu 610041 China

The method of characteristic(MOC) was adopted to analyze the check valve-induced water hammer behaviors for a Parallel Pumps Feedwater System(PPFS) during the alternate startup *** motion of check valve disc was simulated using inertial valve *** parameters including the pressure oscillation,local flow velocity and slamming of the check valve disc *** been *** results showed that severe slamming between the valve disc and valve seat occurred during the alternate startup of parallel *** induced maximum pressure vibration amplitude is up to 5.0 *** scheme of appending a damping torque to slow down the check valve closing speed was also performed to mitigate of water *** has been numerically approved to be an effective approach.

关键词：止回阀建设部事件水锤泵给水系统启动过程压力振动瞬态参数

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Equations for the thermophysical properties of dimethyl carbonate

Equations for the thermophysical properties of dimethyl carb...

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2009 AIChE Annual Meeting, 09AIChE

作者： Zhou, Yong Wu, Jiangtao State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an Shaanxi 710049 China

Dimethyl carbonate (DMC) is a nonirritating and nontoxic chemical, further more;it can be used as a fuel additive. In this work, the thermophysical properties formulations for dimethyl carbonate has been developed based upon a selection of available experimental thermophysical property data. In determining the coefficients of the equation of state, multi-property fitting methods were used;including single-phase pressure-volume-temperature (pVT), heat capacity, vapor pressure, and saturated liquid density data. The equation of state has been developed to conform to the Maxwell criterion for two-phase liquid-vapor equilibrium states and is valid for temperatures from 280 K to 400 K and pressure to 60 MPa, and the extrapolation behavior of the equation of state at high temperatures and high pressures is reasonable. The deviation of the density (100x(ρcal-ρexp)/ρexp) is generally less than 0.1% and does not exceed 0.2% except for very few data points in liquid region. The uncertainty of the vapor pressure of the equation of state is generally less than 2.0%. The deviation of viscosity equation developed is generally less than 2.0%, and the absolute average deviation (AAD) between experimental and calculated values is 1.03%. In additional, the extended corresponding states (ECS) model with R134a as the reference fluid was used to represent viscosities and thermal conductivities, and the absolute average deviations are 1.34% and 1.47%, respectively. Detail comparisons between experimental and calculated data have been performed in the work.

关键词： Hydrostatic pressure

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Study of low-pressure premixed laminar n-heptane+propane/oxygen/nitrogen flames

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Chinese Science Bulletin 2009年第9期54卷 1477-1486页

作者： YU Wu WEI LiXia MA ZhiHao HUANG ZuoHua YUAN Tao TIAN ZhenYu LI YuYang State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an 710049 China National Synchrotron Radiation Laboratory University of Science and Technology of China Hefei 230029 China

Low-pressure premixed laminar n-heptane+propane/oxygen/nitrogen flames were investigated with tunable synchrotron vacuum ultraviolet (VUV) photoionization and molecular-beam sampling mass spectrometry. Three flames with different mass percentage of propane in the fuel blends of 0%, 10%, and 20% were studied. The combustion intermediates were identified by comparing the measured IEs with those values in literatures. Mole fraction profiles of the main species were compared among the three flames. The experimental results provide detailed data in understanding the combustion of n-heptane and n-heptane/propane blends in engine. They are also helpful in establishing and verifying the kinetic models.

关键词：正庚烷火焰丙烷混层低压氮氧真空紫外

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Hydrogen production by biomass gasification in supercriticor subcritical water with Raney-Ni and other catalysts

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中国高等学校学术文摘·能源与动力工程 2009年第4期3卷 456-464页

作者： Aixia PEI Lisheng ZHANG Bizheng JIANG Liejin GUO Ximin ZHANG Youjun LV Hui JIN Zhongyuan Petroleum Company Puguang Natural Gas Treating Plant Sinopec Dazhou 636156 China State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an 710049 China

Gasification of peanut shell, sawdust and straw in supercritical or subcritical water has been studied in a batch reactor with the presence of a series of Raney-Ni and its mixture with ZnCl2 or Ca(OH)2. The main gas products were hydrogen, methane, carbon dioxide, and a small amount of carbon monoxide. Different types of Raney-Ni, containing different metal components such as Fe, Mo or Cr, have different influences on the gasification yield and hydrogen selectivity. The catalysis effect can be improved obviously by adding ZnCl2 or Ca(OH)2 Increasing the reaction temperature or adding ZnCl2 and Ca(OH)2 could improve the mass of H2 in gas products and reduce the mass of CH4 and CO2 at the same time. The possible mechanism is that ZnCl2 can decompose the biomass particle by accelerating cellulose hydrolyzation in high-temperature water, increasing more specific surface to admit catalysts, while Ca(OH)2 can absorb CO2 to produce CaCO3 deposit, which can drop out from the reactant system, and which will drive the reaction to get more hydrogen. With respect to the biomass conversion to gas product and selectivity of H2 at low temperature, the series of Raney-Ni has shown many advantages over other catalysts; thus, this kind of catalyst has great potential to be utilized in the hydrogen industry for the gasification of biomass.

关键词： biomass catalyst gasification Raney-Ni supercritical water hydrogen

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Numerical simulation of entire pulse tube refrigerators

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Hsi-An Chiao Tung Ta Hsueh/Journal of Xi'an Jiaotong University 2009年第3期43卷 1-9页

作者： He, Yaling Gao, Fan Tao, Yubing Liu, Yingwen State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an 710049 China

A one-dimensional and two-dimensional combined computational model (1-D and 2-DCC model) was set up to simulate the performances of the basic type, orifice type and double inlet type pulse tube refrigerators (PTRs). The Darcy-Brinkman-Forchheimer model and the thermally non-equilibrium model were adopted to depict the flow and heat transfer in the regenerator which was modeled by taking the mesh as a porous medium. Parameter communicating algorithms were defined to calculate velocity and temperature at the junctions between the 1-D and 2-D computational regions. Then the simulation codes for the whole PTRs were developed. The working process and complex flow phenomena such as velocity and temperature annular effects and DC flow in PTRs were revealed. The results show that a close loop in the PTR can be formed by using a double-inlet valve which leads to the occurrence of DC flow. For the case studied, the DC flow rate accounts for 4.66% of the total mass flow rate under the present parameters and working conditions.

关键词： Porous materials

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Investigation on surface wettability and surface structure of PTFE after remote oxygen plasma treatment

Investigation on surface wettability and surface structure o...

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2009 IEEE International Conference on Plasma Science - Abstracts, ICOPS 2009

作者： Liu, H.X. Zhang, H.J. State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an 710049 China Department of Environmental Engineering Xi'an Jiaotong University Xi'an 710049 China

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Experimental investigation of turbulent bubbly mixing layer using swirling strength method

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Huagong Xuebao/CIESC Journal 2009年第4期60卷 872-877页

作者： Ning, Tao Chen, Bin Guo, Fude Zhang, Ximin State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an 710049 China

Turbulent bubbly mixing layer was experimentally investigated by PIV and analyzed by using the swirling strength method. The velocity ratio between high speed and low speed was 4:1 and the Reynolds number based on the velocity difference of two streams and hydraulic channel diameter ranged from 4400 to 132000. Bubbles with a diameter from 0.5 mm to 2 mm were injected into the flow field at the end of the splitter and in the low speed side separately. By using the swirling strength method, the vortex structures excluded the effect of shear were shown clearly, and were concentrated in the coniform area of the central mixing flow field. With increasing Reynolds number, swirling strength increased and the coniform area became narrow. Swirling strength first increased and then decreased along the downstream direction at the same Reynolds number. When injected at the end of the splitter, most of the bubbles were distributed in the downstream area of the mixing layer where swirling strength was larger. However, when the bubbles were injected in the low speed side, bubbles were mainly concentrated in the low speed side, but some of them could also be trapped by the vortex structures and move to the central part of the mixing layer. Compared with the single phase case, the results indicated that swirling strength was strengthened when the bubbles were injected at a low Reynolds number, while it was weakened at a high Reynolds number. © All Rights Reserved.

关键词： Reynolds number

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Numerical investigation on thermoacoustic onset

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Kung Cheng Je Wu Li Hsueh Pao/Journal of engineering Thermophysics 2009年第8期30卷 1279-1282页

作者： Wang, Yong He, Ya-Ling Li, Qing Tao, Wen-Quan State Key Laboratory of Multiphase Flow in Power Engineering School of Energy and Power Engineering Xi'an Jiaotong University Xi'an 710049 China

Thermoacoustic phenomena are almost nonlinear, which features self-excited onset. In this paper, a closed-open Rijke tube with the heat source placed at the middle of the tube is modeled. Based on parallel computation, onset of the Rijke tube is carried out numerically. Onset phenomena with various initial fields are observed. Oscillating frequency of the gas within limit cycle is obtained. The gas flow and heat transfer characteristics are studied. These numerical results agree well with those from previous numerical simulations. Such work is helpful for better understanding on the thermoacoustic phenomena, and offers a reference for the study of the thermoacoustic problems with mesoscopic methods such as the lattice Boltzmann method.

关键词： Thermoacoustics

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