http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Measurement of Droplet Size Distribution on Diesel Spray Core by Advanced Laser 2-Focus Velocimeter
( Hironobu Ueki ),( Masahiro Ishida ),( Daisaku Sakaguchi ) 한국액체미립화학회 2005 한국액체미립화학회 학술강연회 논문집 Vol.2005 No.-
An advanced laser 2-focus velocimeter (L2F) was used for the local and instantaneous measurement of droplet size in the core region of diesel fuel spray. The measuring volume of the L2F consists of two foci, where the diameter of the focus is 2 μm and the distance between two foci is 36 μm. The droplet velocity is estimated by dividing the distance between two foci by the measured time-of-flight and the droplet size is estimated by multiplying the velocity by the measured time-of-scattering. Diesel fuel was injected into the atmosphere intermittently from a single-hole nozzle with a hole diameter of 0.2 mm. Measurement was conducted on four planes where the axial distance from the nozzle orifice were 10, 20, 30, and 40 mm. It is shown that the droplet size increases with needle valve opening and varies a little after the needle valve is opened fully. The droplet size becomes smaller to direction of injection. It is found that the droplet size distribution at each measuring position in the spray core region can be fitted to the Nukiyama-Tanasawa`s distribution in most injection period including the condition of transient needle valve opening.
Measurement of Mass Distribution in Diesel Fuel Spray by Using Micro-probe L2F
( Keisuke Komada ),( Daisaku Sakaguchi ),( Hironobu Ueki ),( Masahiro Ishida ) 한국액체미립화학회 2010 한국액체미립화학회 학술강연회 논문집 Vol.2010 No.-
A laser 2-focus velocimeter (L2F) has been applied to measure the velocity and size of droplets in the dense region of diesel spray. Measurement was conducted on the fuel spray injected intermittently into the atmosphere from an injector nozzle with the orifice diameter of 0.113 mm. The injection pressure was set at 40 MPa by using a common rail system. The L2F had a micro-scale probe which consisted of two foci. The focal diameter was about 3 m, and the distance between two foci was 17 m. The data sampling rate of the L2F system was markedly high as 15 MHz. Measurement was conducted at 5 mm downstream from the nozzle exit. The local mass flow rate and the number density were calculated from the measured velocity, size, and arrival time of droplets. It was clearly shown that the mass flow rate was higher at the front of the spray than at the inside, and was higher at the spray center than at the peripheral portion of the spray. The accumulated mass flow in the spray section measured by the L2F was 43% of the injected fuel mass.
Effect of Back Pressure on Droplet Size Near Diesel Injector Nozzle
( Shohei Yamamoto ),( Daisaku Sakaguchi ),( Hironobu Ueki ),( Masahiro Ishida ) 한국액체미립화학회 2010 한국액체미립화학회 학술강연회 논문집 Vol.2010 No.-
A laser 2-focus velocimeter (L2F) with a micro-scale probe was used for measurements of the velocity and size of droplets in diesel sprays. The diameter of the nozzle orifice was 0.113 mm. The injection pressure was set at 40, 80, and 120 MPa by using a common rail system and the ambient pressure was set at 0.1 to 3.0 MPa. The focusing lens of the L2F was set inside a constant volume vessel, and a measurement position was located at 15 mm from the nozzle exit. It was confirmed that no droplet was observed by the L2F before the spray tip reached the measurement position in a high ambient pressure condition. The effect of the ambient pressure on the droplet velocity was found to be small in the near nozzle region. The droplet size decreased when the ambient pressure increased from 0.1 to 1.0 MPa. The droplet size increased when the ambient pressure equal to or increased higher than 2.0 MPa. These tendencies were verified by the KIVA-3V simulation.