The Experts below are selected from a list of 10821 Experts worldwide ranked by ideXlab platform

Yang Chen - One of the best experts on this subject based on the ideXlab platform.

  • catalytic bed Slenderness Ratio and adn methanol Ratio for decomposition and combustion characteristics within ammonium dinitramide adn based green aerospace thruster
    Chinese Journal of Chemical Engineering, 2019
    Co-Authors: Jun Chen, Guoxiu Li, Tao Zhang, Rui Yang, Yang Chen
    Abstract:

    Abstract The decomposition and combustion characteristics of ammonium dinitramide (ADN) based non-toxic aerospace propellant are analytically studied to determine the effects of catalytic bed structure (Slenderness Ratio) and opeRation parameters (mass fraction Ratio of ADN/CH3OH) on the general performance within the ADN-based thruster. In the present research, the non-equilibrium temperature model is utilized to describe the heat transfer characteristics between the fluid phase and solid phase in the fixed bed. We determined the fluid resistance characteristics in the catalytic bed by experiments involving the method of pressure–mass. We have done the simulation study based on the available results in the literature and found the complex physical and chemical processes within the ADN thruster. Furthermore, an optimized catalytic bed Slenderness Ratio was observed with a value of 1.75 and the mass fraction Ratio of 5.73 significantly influenced the propellant performance. These results could serve as a reference to explore the combustion characteristics within the thruster and the prepaRation of future propellants.

  • Catalytic bed Slenderness Ratio and ADN/methanol Ratio for decomposition and combustion characteristics within ammonium dinitramide (ADN)-based green aerospace thruster
    Chinese Journal of Chemical Engineering, 2019
    Co-Authors: Jun Chen, Guoxiu Li, Tao Zhang, Rui Yang, Yang Chen
    Abstract:

    Abstract The decomposition and combustion characteristics of ammonium dinitramide (ADN) based non-toxic aerospace propellant are analytically studied to determine the effects of catalytic bed structure (Slenderness Ratio) and opeRation parameters (mass fraction Ratio of ADN/CH3OH) on the general performance within the ADN-based thruster. In the present research, the non-equilibrium temperature model is utilized to describe the heat transfer characteristics between the fluid phase and solid phase in the fixed bed. We determined the fluid resistance characteristics in the catalytic bed by experiments involving the method of pressure–mass. We have done the simulation study based on the available results in the literature and found the complex physical and chemical processes within the ADN thruster. Furthermore, an optimized catalytic bed Slenderness Ratio was observed with a value of 1.75 and the mass fraction Ratio of 5.73 significantly influenced the propellant performance. These results could serve as a reference to explore the combustion characteristics within the thruster and the prepaRation of future propellants.

Chen Baochun - One of the best experts on this subject based on the ideXlab platform.

  • Experimental study on influence of Slenderness Ratio in concrete filled steel tubular laced columns under eccentric compression
    Journal of Building Structures, 2020
    Co-Authors: Chen Baochun
    Abstract:

    Eccentrically loaded concrete filled steel tubular(CFST) laced columns were tested with Slenderness Ratio as main experimental parameter.Detailed strain measurement and analysis were conducted for the longitudinal elements and the lacing tubes.Test results indicate that the ultimate load carrying capability of the CFST laced columns compressed eccentrically reduces with the increase of Slenderness Ratio.The compression force dominates the loading condition in the longitudinal elements and thus they can be considered as eccentrically loaded column with small eccentricity.The circumferential straining takes effect in longitudinal elements on the loading side after the specimen enters nonlinear phase.During the loading,the lacing tubes remained in elastic stage.It was observed that complicated and excessively large strains existed near the nodes of the longitudinal elements and the lacing tubes,which initiated the tearing of the tube walls and eventually resulted the total failure of the member.

  • Experimental research on concrete filled steel tubular laced columns compressed eccentrically
    Journal of Fuzhou University, 2020
    Co-Authors: Ou Zhi-jing, Chen Baochun
    Abstract:

    Two steel tube laced columns subjected to eccentrically loads are tested.The process of the test and destroy mode are introduced.The ultimate load-carrying capacity of steel tube laced columns compressed eccentrically is calculated with code for design of steel structures(GB 50017-2003). The calculation results by this method are coincident with the test results.In this method,equivalent Slenderness Ratio of laced column is calculated by an addition method to take account of the disadvantageous influence to ultimate load-carrying capacity caused by shearing deformation of lacing members.But for those members with small Slenderness Ratio,the calculation results of equivalent Slenderness Ratio are a little larger and are not agree with its definition.So it is suggested that equivalent Slenderness Ratio is calculated by using an enlarging parameter.

  • Analysis on ultimate load carrying capacity of concrete filled steel tubular laced columns compressed eccentrically
    Journal of Building Structures, 2020
    Co-Authors: Ou Zhi-jing, Chen Baochun
    Abstract:

    The in-plain ultimate load carrying capacity of concrete filled steel tubular(CFST) laced columns compressed eccentrically is calculated based on design guidelines for CFST structure.There is a significant difference between the calculation results and the test results.According to the guidelines,equivalent Slenderness Ratio of laced column is calculated by an additive method to take into account the influence of shear deformation on ultimate load carrying capacity of lacing members.In this method,the shear influence is overestimated for those members with small Slenderness Ratio and may produce an unreasonable result that ultimate load carrying capacity hardly changes with the increase of Slenderness Ratio of members.A method by using an amplification parameter to calculate equivalent Slenderness Ratio of CFST laced columns is presented.The calculation results of ultimate load carrying capability by this method are compared favorably with test results.

Wang Qingli - One of the best experts on this subject based on the ideXlab platform.

Jun Chen - One of the best experts on this subject based on the ideXlab platform.

  • catalytic bed Slenderness Ratio and adn methanol Ratio for decomposition and combustion characteristics within ammonium dinitramide adn based green aerospace thruster
    Chinese Journal of Chemical Engineering, 2019
    Co-Authors: Jun Chen, Guoxiu Li, Tao Zhang, Rui Yang, Yang Chen
    Abstract:

    Abstract The decomposition and combustion characteristics of ammonium dinitramide (ADN) based non-toxic aerospace propellant are analytically studied to determine the effects of catalytic bed structure (Slenderness Ratio) and opeRation parameters (mass fraction Ratio of ADN/CH3OH) on the general performance within the ADN-based thruster. In the present research, the non-equilibrium temperature model is utilized to describe the heat transfer characteristics between the fluid phase and solid phase in the fixed bed. We determined the fluid resistance characteristics in the catalytic bed by experiments involving the method of pressure–mass. We have done the simulation study based on the available results in the literature and found the complex physical and chemical processes within the ADN thruster. Furthermore, an optimized catalytic bed Slenderness Ratio was observed with a value of 1.75 and the mass fraction Ratio of 5.73 significantly influenced the propellant performance. These results could serve as a reference to explore the combustion characteristics within the thruster and the prepaRation of future propellants.

  • Catalytic bed Slenderness Ratio and ADN/methanol Ratio for decomposition and combustion characteristics within ammonium dinitramide (ADN)-based green aerospace thruster
    Chinese Journal of Chemical Engineering, 2019
    Co-Authors: Jun Chen, Guoxiu Li, Tao Zhang, Rui Yang, Yang Chen
    Abstract:

    Abstract The decomposition and combustion characteristics of ammonium dinitramide (ADN) based non-toxic aerospace propellant are analytically studied to determine the effects of catalytic bed structure (Slenderness Ratio) and opeRation parameters (mass fraction Ratio of ADN/CH3OH) on the general performance within the ADN-based thruster. In the present research, the non-equilibrium temperature model is utilized to describe the heat transfer characteristics between the fluid phase and solid phase in the fixed bed. We determined the fluid resistance characteristics in the catalytic bed by experiments involving the method of pressure–mass. We have done the simulation study based on the available results in the literature and found the complex physical and chemical processes within the ADN thruster. Furthermore, an optimized catalytic bed Slenderness Ratio was observed with a value of 1.75 and the mass fraction Ratio of 5.73 significantly influenced the propellant performance. These results could serve as a reference to explore the combustion characteristics within the thruster and the prepaRation of future propellants.

L I Maohua - One of the best experts on this subject based on the ideXlab platform.

  • value selection of Slenderness Ratio and diameter thickness Ratio of steel tube for 1000 kv transmission steel tubular tower legs
    Power system technology, 2009
    Co-Authors: L I Maohua
    Abstract:

    Taking typical steel tubular tower for 1 000 kV power transmission and transformation project from South Anhui to Shanghai, which adopts the form of double circuit on the same tower, as research object, a finite-element model for beam-rod mixed unit of the tower is established, then the stress of the main material for tower body is calculated.Calculation results show that the impacting extent of bending moment at rod end on the stress of main material is closely related with the diameter-thickness Ratio of steel material;by means of statistics and analysis, the correspondence between Slenderness Ratio and stress is given.Based on the results of calculation and analysis and comparing design standards applied in China and other countries, the suggestion on value selection of cross-sectional diameter-thickness Ratio of circular tube used as the main press bending material of the tubular tower is proposed.The results of this research are available for reference to the structural optimization of tubular tower used in 1 000 kV power transmission projects in China.