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http://dx.doi.org/10.3795/KSME-B.2005.29.3.356

The Spray Characteristics of Swirl and Slit Injector to DISI Engine Using LIEF and Mie-scattering Method  

Lee Kihyung (한양대학교 대학교 기계공학과)
Hwang Kyumin (한양대학교 대학원 기계공학과)
Lee Changhee (한양대학교 대학원 기계공학과)
Publication Information
Transactions of the Korean Society of Mechanical Engineers B / v.29, no.3, 2005 , pp. 356-367 More about this Journal
Abstract
The spray characteristics of DISI injector have a great role in gasoline engine efficiency and emission. Thus, many researchers have studied to investigate the spray characteristics of swirl and slit injectors that are used in a DISI engine. In this study, we tried to provide spray parameters, which affect on the spray characteristics such as injection pressure, ambient pressure and ambient temperature. In addition, we calculated $t_{b}\;and\;t_{c}$ to investigate the break up mechanism of test injectors and obtained $C_{v}$ to evaluate the spray characteristics. As the ambient pressure increases in case of slit injector, $C_{v}$ decreases. The laser-induced exciplex fluorescence (LIEF) technique, which is based on spectrally resolved two-color fluorescent emissions, has applied to measure the liquid and vapor phases for on evaporating spray simultaneously. The TMPD/naphthalene proposed by Melton is used as a dophant to detect exciplex signal. The temporal and spatial distribution of liquid and vapor phases during the mixture formation process was measured by this technique. In the LIEF technique, the vapor phase is detected by the monomer fluorescence while the liquid phase is tracked by the exciplex fluorescence. From this experiment, we found that the spray area of the vapor phase is increased with elapsed time after injection and the area of liquid is decreased when the ambient pressure is 0.1MPa. However, the area tends to increase until the end of injection when the ambient pressure is 1.0MPa.
Keywords
Turbulent Occurring Point; Deceleration Point; LIEF(Laser-induced Exciplex Fluorescence); Velocity Coefficient; DISI Engine(Diret Injection Spark Ignition);
Citations & Related Records
Times Cited By KSCI : 2  (Citation Analysis)
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