(3-27) Vortex Promotion in a DI Diesel Engine Combustion Chamber with Bluff Bodies((DE-5)Diesel Engine Combustion 5-Heat Transfer and Fluid Flow)

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概要

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• Turbulence plays an important role on the mixture formation and combustion processes, and consequent emission formation. In this study, the bluff body was set as a vortec generator in the combustion chamber of a DI diesel engine. A 2-dimensional unsteady computer simulation was carried out to clarify the effect of the size and shape of the bluff body and of the air stream velocity on the vortex characteristics. The computed results were compared with the experimental results obtained in a wind tunnel experimentation, where the vortex motion was visualized with smoke tracer method. In the low air velocity conditions, a recirculation zone is generated in the wake of the bluff body. Karman type of vortices then generated as the air velocity increases. In the even higher velocity region, the vortices meander and nibbling the outer air stream into the vortex region. The transition characteristics of above mentioned vortex depend strongly on the shape of the bluff body. A triangular bluff body requires higher air velocity, while the triangular prism and trapezoid prism shaped bluff bodies lower the transition velocity as shown in Fig. 1. The effects of the bluff body are then tested in a single cylinder DI engine, on the engine performance and exhaust emissions. In the engine experimentation, several different shapes of the bluff bodies were tested. For bluff body equipped engine, the smoke emission were reduced by increasing the swirl ratio, which corresponds to the increment of air stream velocity in the computer simulation and wind turned experimentation. The triangular prism bluff body produced lower smoke than the trapezoid prism bluff body equipped experimentation as shown in Fig. 2

• 一般社団法人日本機械学会の論文
• 2001-07-01

著者

• Tanabe Hideaki

  Gunma University

• Sato G.

  Division Of Mechanical Engineering Kanazawa Institute Of Technology

• Kato Satoshi

  Kanazawa Institute of Technology

• Hirai Tetsuro

  Kanazawa Institute of Technology

• Shimooka Ryoichi

  Kanazawa Institute of Technology

• Sato G.

  Kanazawa Institute of Technology

• Kato Satoshi

  Division Of Mechanical Engineering Kanazawa Institute Of Technology

関連論文

• (3-27) Vortex Promotion in a DI Diesel Engine Combustion Chamber with Bluff Bodies((DE-5)Diesel Engine Combustion 5-Heat Transfer and Fluid Flow)
• (1-04) Direct Particulate Sampling Study in a DI Diesel Combustion Chamber((DE-2)Diesel Engine Combustion 2-Combustion and Emission Control)
• 451 直接噴射式ディーゼル機関の燃料特性が微粒子生成に及ぼす影響の調査(応用熱工学III)
• Numerical Study on In-Cylinder Flow Of an Impinging Diffusion Engine(Diesel Engines, Combustion Modeling I)

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