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THE FRICTIONAL RESISTANCE CHARACTERISTICS OF GAS LIQUID TWO PHASE FLOW IN HELICAL COILED TUBES

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Journal of Hydrodynamics 2000年第4期12卷 16-19页

作者： Zhou Yun long, Shi Hui xian Department of Thermal power, northeast china institute of electric power Engineering, Jilin 132012, P.R.china (Received Oct. 28, 1999) Dep. of Thermal power Northeast Inst. of Power Eng. Jilin 132012 China

This paper deal with the frictional resistance characteristics of gas liquid two phase flow in vertical upward helical coiled tubes under the system pressure 0.1 0.6MPa. By means of dimension analysis and π theorem, the correlation formulas were obtained for calculating the frictional resistance coefficients of gas liquid two phase flow in helical coiled tubes. The calculated results agree well with the experimental results.

关键词： frictional resistance gas liquid two phase flow helical coiled tubed

THE　LINEAR　SEPARATED　FLOW　MODEL　FOR　TWO－PHASI　FLOW　INSTABILITY　IN　BOILING　CHANNELS

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Journal of Hydrodynamics 1996年第2期8卷 9-16页

作者： Zhou Yun-long Shen Zeng-ming Shi Hui-xian(northeast china institute of electric power Engineering, Jilin 132012, P. R. china)Chen Ting-kuan Chen Xue-jun(Xi’an Jiaotong University, Xi’an 710049, P. R. china) northeast china Inst of electric Power Engineering Jilin China

This paper presents linear separated model describing two-phase now instability. By employing the method of separated model and system control theory, dynamic system characteristic equations of describing two-phase flow instability are *** can be decided system stability depending on the characteristic value of characteristic equations. The calculated results agree well with the experimental data.

关键词： evaporated tube vapor-liquid two-phase flow instability separated Model

LINEAR ACTIVE STRUCTURES AND MODES (Ⅱ) —DISCRETE SYSTEMS AND BEAMS

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Applied Mathematics and Mechanics(English Edition) 2004年第8期25卷 854-862页

作者：王永刚龚靖School of Civil Engineering and Mechanics Xi'an Jiaotong University Xi'an 710049 P.R.china Department of Civil Engineering northeast china institute of electric power Jilin 132012 P.R.china 张景绘School of Civil Engineering and Mechanics Xi'an Jiaotong University Xi'an 710049 P.R.china School of Civil Engineering and Mechanics Xi'an Jiaotong University Xi'an 710049 P.R.ChinaSchool of Science Chang'an University Xi'an 710064 P.R.China

The basic concepts about the active structures and some attributes of the modes were presented in paper “Liner Active Structures and Modes]( I) ". The characteristics of the active discrete systems and active beams were discussed, especially, the stability of the active structures and the orthogonality of the eigenvectors. The notes about modes were portrayed by a model of a seven-storeyed building with sensors and actuators. The concept of the adjoint active structure was extended from the discrete systems to the beams that were the representations of the continuous structures. Two types of beams with different placements of the measuring and actuating systems were discussed in detail. One is the beam with the discrete sensors and actuators, and the other is the beam with distributed sensor and actuator function. The orthogonality conditions were derived with the modal shapes of the active beam and its adjoint active beam. An example shows that the variation of eigenvalues with feedback amplitude for the homo-configuration and non-homo-configuration active structures.

关键词： I) ". The characteristics of the active discrete systems and active beams were discussed especially the stability of the active structures and the orthogonality of the eigenvectors. The notes about modes were portrayed by a model of a seven-s

A NON LINEAR ANALYSIS OF TWO PHASE FLOW INSTA BILITY IN PARALLEL CHANNELS OF A BOILING SYSTEM

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Journal of Hydrodynamics 1999年第3期11卷 36-43页

作者： Zhou Yun long, Cheng Zhuo ming, Cai Hui northeast china institute of electric power Engineering, Jilin 132012, P.R.china (Received Sep. 18, 1998)

This paper proposes a non linear mathematical model of two phase flow instability in parallel channels of a boiling system. Close agreement is obtained between calculations based on this model and measurements of the stable boundary in a system of two channels. The model is also applied to the cases of three and four parallel channels.

关键词： parallel channel flow instability mathematical model

LINEAR ACTIVE STRUCTURES AND MODES (Ⅰ) —BASIC CONCEPTS AND PROPERTIES

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Applied Mathematics and Mechanics(English Edition) 2004年第8期25卷 845-853页

作者：张景绘龚靖School of Civil Engineering and Mechanics Xi'an Jiaotong University Xi'an 710049 P.R.china Department of Civil Engineering northeast china institute of electric power Jilin 132012 P.R.china 王永刚School of Civil Engineering and Mechanics Xi'an Jiaotong University Xi'an 710049 P.R.china School of Science Chang'an University Xi'an 710064 P.R.china School of Civil Engineering and Mechanics Xi'an Jiaotong University Xi'an 710049 P.R.China

Some basic concepts about the active structures were firstly explained, and the main subjects to study in the field of active structure dynamics were synthesized. For the linear active structures, the annotations on the modes were done in detail. The physical meanings of the right and left eigenvectors were explained. The right eigenvectors are the modal shapes and the modal responses of an active structure depend on the left ones. The adjoint structure of an active structure was defined and the reciprocity theorem was interpreted. For two active structures, which are adjoint to each other and with the reciprocal gain-matrices, the right and left eigenvector are reciprocal. The relationship between an active structure and the corresponding passive structure is expressed with the transfer functions, which is employed to resolve the estimation problems.

关键词： active structure vibration control smart structure mode

Numerical Simulations of the air-solid two-phase-flow in the Air-Cushion AntiErosion Cascades

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Numerical Simulations of the air-solid two-phase-flow in the...

CSPE-JSME-ASME International Conference on power Engineering

作者： Ting-ting Guo Shao-hua Li Guo-hui Wang Zhong Xu(Xi’an Jiaotong University Xi’an 710049 china)(northeast china institute of electric power Engineering Jiiin 132012 china)

＜正＞The SIMPLE algorithm combining with the normal k-εturbulence model was adopted to simulate the air-phase flow. Thethickness of the air-cushion was predicted under the different conditions. The trajectory approach was used to calculate theparticle trajectory The results showed that air-cushion could decrease the probabilities of particles impacting on the blade.

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糠醛渣热解特性及其动力学研究

太阳能学报 2004年第6期25卷 750-754页

作者：王擎侯凤云孙东红崔畅林孙键东北电力学院动力系吉林132012

生物质热解是未来最有前途的可再生能源形式之一,为优化参数和改进设备,在不同升温速率下对糠醛渣的热解特性进行热重分析实验研究。实验采用美国Perkin Elmer公司生产的Pyris 1TGA热重分析仪,载气为纯度99.9%的氮气。结果表明糠醛渣热... 详细信息

生物质热解是未来最有前途的可再生能源形式之一,为优化参数和改进设备,在不同升温速率下对糠醛渣的热解特性进行热重分析实验研究。实验采用美国Perkin Elmer公司生产的Pyris 1TGA热重分析仪,载气为纯度99.9%的氮气。结果表明糠醛渣热解随温度升高具有阶段性,表现了糠醛渣热解的复杂性。通过对不同升温速率下的失重曲线对比表明,升温速率对热解失重有显著影响。最后根据实验数据建立了热解动力学模型,分别用积分法和微分法对热解动力学参数进行求解。

关键词：糠醛渣热解热重分析动力学