排序方式: 共有84条查询结果,搜索用时 15 毫秒
41.
基于多普勒测距雷达的实时距离测量系统 总被引:1,自引:0,他引:1
研究了机场助航灯光强动态检测技术的工作原理,分析了光强动态检测中距离测量的特点,基于多普勒测距雷达原理,构建了非接触式实时距离测量系统.结合硬件板卡,采用面向对象方法设计了测量软件,使用多线程技术,使距离测量和灯光照度测量在不同的线程中工作,并对整个光强动态测量过程进行自动控制.试验结果表明:应用该系统实现了距离测量和... 相似文献
42.
43.
44.
45.
46.
47.
Analysis of the transient atomization characteristics of diesel spray using time-resolved PDPA data 总被引:1,自引:0,他引:1
The transient atomization characteristics of a single-hole diesel spray were investigated to clarify the time-dependent droplet
formation process of the spray through time-resolved analysis of the droplet size data acquired by using a 2-D PDPA (phase
Doppler particle analyzer). Comparisons among the three single-hole diesel nozzles on the atomization characteristics were
made to confirm the effects of the hole-diameter. The hole diameter of the single-hole diesel nozzles varied with dn=0.22, 0.32 and 0.42 mm. The time-resolved diameter, SMD (Sauter mean diameter) and AMD (arithmetic mean diameter) of droplets
in diesel spray injected into still ambient air were measured. The SMD and AMD decreased with decreasing nozzle hole diameter.
The SMD distribution along the spray centerline steeply decreased with increasing axial distance before reaching a constant
value. In the time-dependent analysis of the SMD of the whole flow field, the SMD gradually increased with time after the
initiation of injection, reached a maximum value, and then decreased. 相似文献
48.
49.
50.