Dec 2007, Volume 1 Issue 4

    

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• Liquid metal cooling in thermal management of computer chips

  MA Kunquan, LIU Jing

  2007, 1(4): 384-402. https://doi.org/10.1007/s11708-007-0057-3

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  With the rapid improvement of computer performance, tremendous heat generation in the chip becomes a major serious concern for thermal management. Meanwhile, CPU chips are becoming smaller and smaller with almost no room for the he
• Molecular characterization and fermentative hydrogen production of a wild anaerobe in clostridium genus

  LI Yongfeng, REN Nanqi, LI Jianzheng, LI Peng, YANG Chuanping

  2007, 1(4): 403-407. https://doi.org/10.1007/s11708-007-0058-2

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  Anaerobic process of biohydrogen production is developed in this paper. The isolation and identification of high efficient biohydrogen production anaerobic bacteria are the important foundations for the fermented biohydrogen produc
• Study on direct measurement method of vorticity from particle images

  RUAN Xiaodong, FU Xin, YANG Huayong

  2007, 1(4): 408-412. https://doi.org/10.1007/s11708-007-0059-1

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  To overcome the shortcomings of conventional methods for vorticity measurement, a new direct measurement of vorticity (DMV) method extracting vorticity from particle images was proposed. Based on the theory of fluid flow, two matc
• Mechanism study on cellulose pyrolysis using thermogravimetric analysis coupled with infrared spectroscopy

  WANG Shurong, LIU Qian, LUO Zhongyang, WEN Lihua, CEN Kefa

  2007, 1(4): 413-419. https://doi.org/10.1007/s11708-007-0060-8

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  Based on the investigation of the polysaccharide structure of cellulose by using Fourier transform spectrum analysis, the pyrolysis behaviour of cellulose was studied at a heating rate of 20 K/min by thermogravimetric (TG) analysis
• Characteristics and energy distribution of modulated multi-pulse injection modes based diesel HCCI combustion and their effects on engine thermal efficiency and emissions

  LIU Bin, SU Wanhua, WANG Hui, HUANG Haozhong

  2007, 1(4): 420-427. https://doi.org/10.1007/s11708-007-0061-7

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  Cycle fuel energy distribution and combustion characteristics of early in-cylinder diesel homogenous charge compression ignition (HCCI) combustion organized by modulated multi-pulse injection modes are studied by the engine test.
• Experimental study of humid air reverse diffusion combustion in a turbulent flow field

  GE Bing, ZANG Shusheng, GU Xin

  2007, 1(4): 428-434. https://doi.org/10.1007/s11708-007-0062-6

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  Experiments were performed to investigate the differences between the propane/air turbulent diffusion reactive flows past bluff-body and the propane/humid air turbulent diffusion reactive flows in the same conditions. The velocity
• Numerical investigation of aerodynamic performance influenced by circumferentially pre-swirling coming flow on the crossover and de-swirling cascade of a multistage centrifugal compressor

  WANG Qikun, CHEN Kangmin

  2007, 1(4): 435-440. https://doi.org/10.1007/s11708-007-0063-5

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  Numerical investigation is implemented on aerodynamic performance inside the crossover and de-swirling cascade of a multistage centrifugal compressor. The emphasis is put on the aerodynamic performance influenced by the circumferent
• Study on emissions reduction of DMCC engine with oxidation catalyst

  YAO Chunde, LIU Xibo, WANG Hongfu, LIU Xiaoping, CHENG Chuanhui, WANG Yinshan

  2007, 1(4): 441-445. https://doi.org/10.1007/s11708-007-0064-4

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  A new combustion model diesel/methanol compound combustion (DMCC) is presented, in which methanol is injected into manifold and ignited by certain amount of diesel fuel. The results showed that DMCC remarkably decreased the emission
• A numerical study of helium-heated inorganic membrane reformer coupling to HTGR

  YIN Huaqiang, JIANG Shengyao, JU Huaiming, ZHANG Youjie

  2007, 1(4): 446-450. https://doi.org/10.1007/s11708-007-0065-3

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  Based on one-dimensional quasi-homogeneous model, a steady-state model and its computer program were developed for helium-heated inorganic membrane reformer coupling to high temperature gas-cooled reactor (HTGR). The results show
• Experimental research on catalysts and their catalytic mechanism for hydrogen production by gasification of peanut shell in supercritical water

  PEI Aixia, GUO Liejin, JIN Hui

  2007, 1(4): 451-456. https://doi.org/10.1007/s11708-007-0066-2

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  Peanut shell, mixed with sodium carboxymethylcellulose, was gasified at a temperature of 450°C and a pressure range from 24 to 27 MPa with the presence of different catalysts, including K₂CO₃, ZnCl₂ and Raney-Ni. The experimental results show that different catalysts have greatly different effects on the reaction. Gasification efficiency (GE), hydrogen gasification efficiency (GHE), carbon gasification efficiency (GCE), yield of hydrogen production (Y_H2 ) and potential yield of hydrogen production (Y_PH2) are applied to describe the catalytic efficiency. From the result of gaseous components, ZnCl₂ has the highest hydrogen selectivity, K₂CO₃ is lower, and Raney-Ni is the lowest, but Raney-Ni is the most favorable to gasify biomass among the three catalysts, and its G_E, G_HE, G_CE reach 126.84%, 185.71%, 94.24%, respectively. As expected, hydrogen selectivity increased and CH₄ reduced rapidly when the mixture of ZnCl₂ and Raney-Ni is used under the same condition. The optimization mixture appeared when 0.2 g of ZnCl₂ was added to 1 g of Raney-Ni, 43.56 g · kg^-1 of hydrogen pro duction was obtained. In addition, the catalytic mechanisms of different catalysts were analyzed, and the possible reaction pathway was brought forward, which helped to explain the experiment phenomena and results correctly.
• Study of operation optimization based on data mining technique in power plants

  LI Jianqiang, LIU Jizhen, GU Junjie, NIU Chenglin

  2007, 1(4): 457-462. https://doi.org/10.1007/s11708-007-0067-1

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  The determination of operation optimization value is very important for economic analysis and operation optimization in power plants. The operation optimization value determined by traditional methods usually cannot reflect the ac
• Effects of compression ratio on the combustion characteristics of a homogeneous charge compression ignition engine

  SONG Ruizhi, ZHOU Longbao, LIU Shenghua, LI Wei, HU Tiegang

  2007, 1(4): 463-467. https://doi.org/10.1007/s11708-007-0068-0

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  The effects of homogeneous charge compression ignition (HCCI) engine compression ratio on its combustion characteristics were studied experimentally on a modified TY1100 single cylinder engine fueled with dimethyl ether. The resul
• A dynamic procedure based on the scale-similarity hypotheses for large-eddy simulation

  ZHOU Bing, CUI Guixiang, CHEN Naixiang

  2007, 1(4): 468-472. https://doi.org/10.1007/s11708-007-0069-z

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  Current dynamic procedures in large-eddy simulation treat the two subgrid-scale stresses in the Germano identity with the same subgrid base model. Thus to get the base model coefficient, the coefficient must be assumed to be consta
• Performance analysis of a centrifugal compressor with variable inlet guide vanes

  XIAO Jun, GU Chuangang, SHU Xinwei, GAO Chuang

  2007, 1(4): 473-476. https://doi.org/10.1007/s11708-007-0070-6

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  The flow in a centrifugal compressor stage with variable inlet guide vanes (VIGVs) is investigated by numerical simulation in this paper. Analysis of the performance curves and relative velocity vectograms indicates that performan
• Heat transfer in a large-scale circulating fluidized bed boiler

  CHENG Leming, WANG Qinhui, SHI Zhenglun, LUO Zhongyang, NI Mingjiang, CEN Kefa

  2007, 1(4): 477-482. https://doi.org/10.1007/s11708-007-0071-5

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  Heat transfer of a furnace in a large-scale circulating fluidized bed (CFB) boiler was studied based on the analysis of available heat transfer coefficient data from typical industrial CFB boilers and measured data from a 12 MW
• Sensitivity analysis of torsional vibration behavior of the shafting of a turbo generator set to changes of its mechanical parameters

  XIE Danmei, ZHANG Hengliang, DONG Chuan, LIU Zhanhui, YANG Changzhu

  2007, 1(4): 483-486. https://doi.org/10.1007/s11708-007-0072-4

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  Aiming at a 300 MW turbo-generator model, the sensitivity of natural torsional frequencies and modes of torsional vibration (TV) to the rotational inertia and stiffness of the turbo-generator were analyzed. Calculation results show