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International journal of automotive technology 5건

  1. [국내논문]   ANALYSIS OF DIRECT INJECTION SI STRATIFIED COMBUSTION IN HYDROGEN LEAN MIXTURE - COMBUSTION PROMOTION AND COOLING LOSS BY HYDROGEN -  

    Shudo, Toshio (Musashi Institute of Technology, Japan ) , Tsuga, Koichiro (Jatoco Transtechnology Co.)
    International journal of automotive technology v.2 no.3 ,pp. 85 - 91 , 2001 , 1229-9138 ,

    초록

    Characteristics of methane direct-injection spark-ignition stratified combustion in lean hydrogen mixture were analyzed both in a single cylinder engine and in a constant volume combustion chamber. Combustion pressure and Instantaneous combustion chamber wall temperature during the combustion process were measured with a thin-film thermocouple and used in analyses of combustion and cooling loss. Results in this research show that the premixed hydrogen increases cooling loss to combustion chamber wall while achieving combustion promotion, and the combustion system is effective especially in lean mixture conditions. Analysis of flame propagation was also done with Schlieren photography in the constant volume combustion chamber.

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  2. [국내논문]   ANALYSIS OF IN-CYLINDER FUEL-AIR MIXTURE DISTRIBUTION IN A HEAVY DUTY CNG ENGINE  

    Lee, Seok-Y. (Mechanical Engineering Department, Pohang University of Science and Technology ) , Huh, Kang-Y. (Mechanical Engineering Department, Pohang University of Science and Technology ) , Kim, Y.M. (Engine R&D Group, Korea Institute of Machinery and Materials ) , Lee, J.H. (Engine R&D Group, Korea Institute of Machinery and Materials)
    International journal of automotive technology v.2 no.3 ,pp. 93 - 101 , 2001 , 1229-9138 ,

    초록

    Distribution of fuel-air mixture has a strong influence on performance and emissions of a compressed natural gas (CNG) engine. In this paper, parametric study is performed by KIVA-3V to investigate fuel-air mixture with respect to injection timing, cycle equivalence ratio and engine speed. With open-valve injection intensive mixing during intake and compression stroke results in relatively homogeneous mixture in the cylinder. Sequential induction of fuel-air mixture and fresh air results in stratification in the cylinder among the test cases at closed-valve injection. There is close similarity in the calculated distributions of the mixture in the cylinder with different cycle equivalence ratios and engine speeds. The results are compared against pressure traces and flame images obtained in a single cylinder engine converted from a 11L six-cylinder heavy duty diesel engine.

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  3. [국내논문]   BREAKUP LENGTH OF CONICAL EMULSION SHEET DISCHARGED BY PRESSURE-SWIRL ATOMIZER  

    Rhim, Jung-Hyun (Dept. of Agricultural Machinery Engineering, Chunbuk National University ) , No, Soo-Young (Dept. of Agricultural Machinery Engineering, Chunbuk National University)
    International journal of automotive technology v.2 no.3 ,pp. 103 - 107 , 2001 , 1229-9138 ,

    초록

    Many researches on pressure-swirl injectors due to the variety of application have been conducted on the effects of nozzle design, operating conditions, properties of liquid and ambient conditions on the flow and spray characteristics. The breakup length of conical emulsified fuel sheet resulting from pressure-swirl atomizer using in the oil burner was investigated with the digital image processing method with neat light oil and emulsion with water content of lotto% and the surfactant content of 1-3%. The injection pressure ranged from 0.1 to 1.2 MPa was selected. The various regimes for the stage of spray development within the experimental conditions selected in this study is newly suggested in terms of Ohnesorge number and injection pressure. The breakup length for both criteria show the same tendency even though the random nature of perforation and disintegration process of liquid sheet. The stage of spray development is widely different with the physical properties of liquid atomized, mainly viscosity of liquid. The breakup length decreases smoothly with increase in the injection pressure for the lower viscous liquid.

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  4. [국내논문]   EFFECTS OF WATERY VAPOR CONCENTRATION ON DROPLET EVAPORATION IN HOT ENVIRONMENT  

    Lee, M.J. (Department of Automotive Engineering, Yangsang College ) , Kim, Y.W. (Nexen Co., LT. ) , Ha, J.Y. (Department of Mechanical Engineering, Dong-A Univ. ) , Chung, S.S. (Department of Mechanical Engineering, Dong-A Univ.)
    International journal of automotive technology v.2 no.3 ,pp. 109 - 115 , 2001 , 1229-9138 ,

    초록

    A study has been conducted to clarify the effect of watery vapor concentration in hot ambient on droplet evaporation. Droplets of water, ethanol, n-hexadecaneand n-heptane were used in this experimental study. Ambient conditions are fixed at 470 K in temperature, 0.1 MPa in pressure and 2 m/s in velocity of ambient air. Watery vapor concentration was changed 0%~40% by 10% by add water to air. To obtain the time histories of droplet diameter after exposed in ambient, a suspended droplet in hot and humid ambient stream was synchronized with a back flash light, and enlarged droplet images were taken by a CCD camera. The evaporation rate constant of water droplet decreases slightly with the vapor concentration because diffusion velocity reduction of droplet vapor occurs on the surface. The values of ethanol and n-heptane droplet actively increase by effect that water from condensation of vapor flows into the droplet. The evaporation rate constant of n-hexadecane which has higher boiling point than water increases within around 30% of the concentration.

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  5. [국내논문]   A HYBRID SCHEME USING LU DECOMPOSITION AND PROJECTION MATRIX FOR DYNAMIC ANALYSIS OF CONSTRAINED MULTIBODY SYSTEMS  

    Yoo, W.S. (Mechanical Engineering, Pusan National University ) , Kim, S.H. (Environmental Engineering, Pusan National University ) , Kim, O.J. (Doowon Institute of Technology)
    International journal of automotive technology v.2 no.3 ,pp. 117 - 122 , 2001 , 1229-9138 ,

    초록

    For a dynamic analysis of a constrained multibody system, it is necessary to have a routine for satisfying kinematic constraints. LU decomposition scheme, which is used to divide coordinates into dependent and independent coordinates, is efficient but has great difficulty near the singular configuration. Other method such as the projection matrix, which is more stable near a singular configuration, takes longer simulation time due to the large amount of calculation for decomposition. In this paper, the row space and the null space of the Jacobian matrix are proposed by using the pseudo-inverse method and the projection matrix. The equations of the motion of a system are replaced with independent acceleration components using the null space of the Jacobian matrix. Also a new hybrid method is proposed, combining the LU decomposition and the projection matrix. The proposed hybrid method has following advantages. (1) The simulation efficiency is preserved by the LU method during the simulation. (2) The accuracy of the solution is also achieved by the projection method near the singular configuration.

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