International Conference


TitleSeoksu Moon, Jaejoon Choi, Kitae Yeom and Choongsik Bae, Measurements of Droplet Size Distribution and In-Cylinder Mixture Formation from a Slit Injector in a Direct-Injection Gasoline Engine, Third International Conference on Optical and Laser Diagnostics (ICOLAD 2007), May 2007, London, UK.

Seoksu Moon, Jaejoon Choi, Kitae Yeom and Choongsik Bae, Measurements of Droplet Size Distribution and In-Cylinder Mixture Formation from a Slit Injector in a Direct-Injection Gasoline Engine, Third International Conference on Optical and Laser Diagnostics (ICOLAD 2007), May 2007, London, UK.

Abstract

The droplet size distribution and in-cylinder mixture formation of a slit injector were investigated under varied fuel temperature and air flow conditions. This variance in fuel temperature and air flow represents the altered spray momentum and external forces acting upon the spray. Phase Doppler anemometry (PDA) was used to investigate the effect of fuel temperature and air flow on droplet size distribution. The in-cylinder mixture formation process and the factors affecting the in-cylinder mixture distribution were analyzed under various fuel temperature and air flow conditions using laser induced fluorescence (LIF). When the fuel temperature and air flow velocity increased, the smaller droplets were entrained to the upper and central parts of the spray altering the initial droplet size distribution. The reduced spray momentum decreased the spray penetration in the combustion chamber, and the interaction between the spray and piston bowl was degraded. This phenomenon eventually caused a relatively lean and dispersed mixture distribution near the spark plug at high fuel temperatures. The optimal spray momentum and external force depend on the fuel quantity (air-fuel ratio) and piston bowl shape. Consequently, the spray momentum and the external forces acting upon the spray should be optimized to form the stoichiometric and well-distributed mixture near the spark plug.

PreviousYongrae Kim, Kyoungdoug Min, Min Soo Kim, Suk Ho Chung and Choongsik Bae, “Development of a Reduced Chemical Kinetic Mechanism and Ignition Delay Measurement in a Rapid Compression Machine for CAI Combustion”, SAE Paper 2007-01-0218, presented at SAE Congress, Detroit, April, 2007.
NextHaiyun Su, Sebastian Mosbach, Markus Kraft, Amit Bhave, Sanghoon Kook, and Choongsik Bae, “Two-stage Fuel Direct Injection in a Diesel Fuelled HCCI Engine”, SAE Paper 2007-01-1880 (JSAE 20077195), to be presented at SAE Fuels and Lubricants Meeting, Kyoto, Japan, 2007.

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