本文介绍了一种带有平面（无法兰）和法兰罩的局部排气通风系统的研究。测量了排气罩开口前的中心线速度和速度轮廓，并与之前报告的其他结果进行了比较。推导了整个发动机罩轴范围内的中心线速度相关性。还分析了湍流强度和周围设备对速度等值线的影响。测定了三种不同类型的污染物颗粒（锯末、小麦粉和沙子）的捕获速度。与排气口前面的普通罩相比，法兰罩提供更高的速度。周围的设备会阻碍流动的能量，并会减少排气罩的覆盖范围。 震源位置对小麦粉和锯末的捕获速度有明显影响，但对沙粒的捕获速度影响不大。单位:SICitation:Symposium，ASHRAE交易，第109卷，pt。堪萨斯城，2003年

This paper presents the study of a local exhaust ventilation system with plain (unflanged) and flanged hoods. Centerline velocity and velocity contours in front of exhaust hood openings were measured and compared to other previously reported results. Centerline velocity correlations are derived for a full range of hood axes. The effect of turbulence intensity and surrounding equipment on the velocity contours is also analyzed. Capture velocity for three different types of contaminant particles (saw dust, wheat flour, and sand) was determined. Flanged hoods provide higher velocity compared to plain hoods in front of the exhaust opening. Surrounding equipment blocks the energy of the moving flow and tends to reduce the reach of exhaust hoods. Source location has an appreciable effect on the capture velocity for wheat flour and saw dust but little effect on the sand particles.Units: SI