Estimation of Mass Distribution of Diesel Fuel Spray in High-Number-Density Region by L2F
Estimation of Mass Distribution of Diesel Fuel Spray in High-Number-Density Region by L2F
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L2F 估计高数密度区域柴油喷雾的质量分布
DOI：
10.1299/kikaib.77.274
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发表时间：
2011
期刊：
影响因子：
--
通讯作者：
M. Ishida
中科院分区：
文献类型：
--
作者：
Keisuke Komada;D. Sakaguchi;H. Ueki;M. Ishida
激光 2 焦点测速仪 (L2F) 已用于测量柴油喷雾密集区域中液滴的速度和尺寸。研究了从孔径为0.113mm的喷射器喷嘴间歇地喷射到大气中的燃料喷雾。使用共轨系统将注射压力设定为40 MPa。 L2F 具有由两个焦点组成的微型测量体积。焦点直径约为3μm，两个焦点之间的距离为17μm。 L2F系统的最大数据采样率明显高达15 MHz。测量在喷嘴下游 25 mm 处进行。根据测量的液滴速度、尺寸和到达时间计算几个指定时间的局部质量流量和数密度。可以清楚地看出，喷雾前端的质量流量高于内部，喷雾中心的质量流量高于外围。 L2F测得的喷雾段累积质量流量几乎等于喷射燃油质量，误差在5%以内。
A laser 2-focus velocimeter (L2F) has been applied for measurements of velocity and size of droplets in the dense region of diesel spray. Investigated was 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 measuring volume which consisted of two foci. The focal diameter was about 3 μm, and the distance between two foci was 17 μm. The maximum data sampling rate of the L2F system was markedly high as 15 MHz. Measurement was conducted at 25 mm downstream from the nozzle. The local mass flow rate and the number density were calculated at several specified times from the measured velocity, size, and arrival time of droplets. It was clearly shown that the mass flow rate was higher at the spray front than the inside, and was higher at the spray center than the periphery. The accumulated mass flow rate in the spray section measured by the L2F was almost equal to the amount of injected fuel mass within 5%.