Numerical Simulation of Flow field and Temperature field in Combustion Chamber Widened Suddenly     

Wu Chenbo Liang Xiaoping 《保鲜与加工》1997,(2):117-122

The flowfield and temperature field are numerically Simulated by the mathematical model of the fluid flow and heat transfer in circular combustion chamber widened suddenly. The distributions and influence factors of the flow field and temperature field are studied in it. The results have the guiding significance for the design of combustion chamber. The mathematical models can serve as the quantitative analysis methods for design.  相似文献   

Research of the Coefficient of Wind-induced Vibration About Complicated Tall Buildings     

ZHANG Liang-liang  LUO Sheng  YU Yang  WU Yun-fang  LIN Guan-ming  LIN Rong-sheng 《保鲜与加工》2006,(5):96-98

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STATE VARIABLE METHOD FOR DYNAMIC SIMULATION OF HVDC SYSTEMS     

Zhang Wei Ren Zhen Qin Yihong Liao Qing 《保鲜与加工》1990,(1):56-62

A flexible mathematical model used for dynamic simulation studies of HVDC systems which is based on the stale variable method is presented, and the correspongding computer program has been implemented. Generality, easy to use, and suitable to run on microcomputers are the main features of the model and the computer program. Therefore the model is easy to be extended for application. An example is given in the paper to verily the coneclness of the model and the program.  相似文献   

DETERMINATION OF METALLIC IRON IN HIGH TITANIUM SLAG BY HEADSPACE GAS CHROMATNGRALHY     

Huang Zhiqin Lei Qingru You Bo 《保鲜与加工》1990,(2)

The following details are discussed in the present paper, after high titanium slag and H3PO4 is put in the closed system,the .reaction takes place under controlled temperature conditions, and the gas produced is collected. The two phases of gas liquid attain kinetic equilibrium, ihe gas above the liquid is used to make GC analysis with the aid of chromatographic column of 5A molecular sieve, TCD and N2 30ml/min. Satisfactory quantitative results can be achieved with simple instruments and uncomplicated operation technique.  相似文献   

Recommendations on Shrinkage and Temperature Reinforcements in Concrete Slabs     

LI Lei 《保鲜与加工》2004,(4):45-50

The mechanism of shrinkage cracking is discussed with a simple member, which is fully restrained and subjected only to an axial restraining force caused by shrinkage, while a simple procedure is presented for the determination of the number and spacing of the cracks and the average crack width. With the simple model, some examples are shown to compare the provisions for minimum shrinkage and temperature reinforcement in GB 50010-2002 Code, ACI 318-02 Code and AS 3600-1988 Code. The results show that the provisions in GB 50010-2002 Code are too weak in comparison with the others. Finally, some recommendations are proposed.  相似文献   

EFFECT OF MICRO-GALLIUM ON THE INTERGRANULAR SEGREGATINN OF PHOSPHORUS IN CARBON STEELS     

He Zefu Wu Yunjian 《保鲜与加工》1988,(4)

The effect of small amounts of gallium on the intergranular segregation of phosphorus in carbon steels is discussed, with the help of the impact test, fracture morphology and micro-structure analyses, combined with composition analysis on the fracture surfaces by Auger electronspectrometer. The results show that gallium in the steel with a content of gallium more than ten thou-sandth can suppress, to some extent, the intergranular segregation of phosphorus and retard the tempering process. As a result, the temper embrittlement of the steel disappears and the embrittlement transition temperature declines.  相似文献   

Research on Optimum System of Slag Making of ANYANG Iron & Steel CO.BF     

Wen Guangyuan Peng Henian 《保鲜与加工》1997,(6):30-35

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ELLIPSOMETRIC SPECTROSCOPY OF ELECTROCHROMISM OF POLYANILINE FILMS     

Xie Shangfen Shen Hui 《保鲜与加工》1991,(4):93-96

The electrochromism of polyaniline films, which is prepared by electropolymer-ization from aniline in acidic aqueous solution onto platinum,is investigated in 330-700nm through in-situ ellipsometric technique. The results indicate that the ellipsometric peak of the reduced state(-0. 2V) of the film appears at 390-400nm and the oxidized state(0. 55V) at 500-530nm. The elec-trochromic reaction from the reduced "yellow" state to the oxidized "green" state is suggested via intermediate state whose ellipsometric peak appears at 466-470nm.  相似文献   

The Study on Heat Transfer Through Flux Film in the Continuous Casting Mold     

Zhang Ping  Wei Qingchen  Hu Jianjun 《保鲜与加工》1996,(4):77-81

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FDTD Method''s Application in the Research of Television Interference From High Voltage Transmission Line     

LIU Qing-song~ 《保鲜与加工》2004,(4):15-19

The mechanism of television interference is discussed from High voltage transmission line. Then the computational model is established, and scattering fields are calculated with the finite-difference time-domain(FDTD) method, and the results are visualized. The scattering effects of High voltage transmission lines on horizontal polarization waves (corresponding to TM mode) are greater than on vertical polarization waves (corresponding to TE mode).  相似文献