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Study of vortex structure in high number density spray based onturbulence correlation

基于湍流关联的高数密度喷雾涡流结构研究

基本信息

批准号：
22560172
负责人：
UEKI Hironobu
金额：
$ 2.83万
依托单位：
Nagasaki University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2010
资助国家：
日本
起止时间：
2010 至 2012
项目状态：
已结题

项目摘要

A laser 2-focus velocimeter (L2F) was used for measurements of velocity and size of droplets in diesel sprays injected intermittently into the atmosphere from aninjector with an orifice of 0.113mm in diameter. The rail pressure was set at 80MPa, and the solenoid energizing time was set at 3.0ms. Three measurement positions were located on the plane 6, 9 and 12 mm from the nozzle exit. The integral scale of turbulence in velocity, the one in size and the one in data rate were evaluated by correlation based slotting technique. The integral scale of turbulence in velocity is larger than the one in size and data rate. Every scale increases with the distance of droplet flight.Phase Doppler technique was used for the measurements of the velocity, size and flight angle of droplets in diesel sprays injected intermittently into the atmosphere from an injector. In the vicinity of the spray axis, droplets have the components of radially outward velocity in addition to that of the spray axis direction velocity. And the velocity components of spray axis direction decreased with the radius. It is understood that the trajectory of the spray observed diagonally backward come ftom the difference in velocities near the spray axis. Droplets which move inward from the periphery of the spray change their directions of velocity vector from the radially inward to the spray axis. A combination of the droplet movements which were mentioned above is considered to make up a vortex.

用激光双聚焦测速仪(L2F)测量了直径为0.113 mm的喷油器间歇喷射到大气中的柴油喷雾液滴的速度和尺寸。钢轨压力设定为80 mpa，螺线管通电时间设定为3.0ms。三个测量位置分别位于距喷嘴出口6 mm、9 mm和12 mm的平面上。采用基于相关的缝隙技术计算了湍流的速度积分尺度、尺度积分尺度和数据速率积分尺度。湍流在速度上的积分尺度大于在尺度和数据速率上的积分尺度。采用相位多普勒技术对喷油器间歇喷射到大气中的柴油喷雾液滴的速度、尺寸和飞行角度进行了测量。在喷雾轴线附近，除了喷雾轴线方向的速度外，液滴还具有径向向外的速度分量。喷雾轴向的速度分量随半径的增大而减小。可以理解的是，观察到的喷雾向后倾斜的轨迹来自喷雾轴线附近的速度差。从喷雾外围向内移动的液滴，其速度矢量的方向从径向向内变化到喷雾轴线。上述液滴运动的组合被认为构成了漩涡。