英语翻译This paper presents results from numerical simulations c

英语翻译
This paper presents results from numerical simulations conducted to estimate the inertial range (stopping distance) of large aerosol particles ejected away from local exhaust hoods.Potential flow theory is used to specify the air velocity along the centerline of a flanged circular hood.A high-order Gear method is used to integrate the particle equations of motion with drag coefficients in the transitional range.The results allow for a relative comparison of hood performance based on the energy cost needed to stop the particle within a specified distance.Hood size is shown to be a critical factor,while the capture velocity generated by the hood at the point of particle ejection is of secondary importance.
Local exhaust hoods are a primary engineering control for protecting workers from excessive exposure to toxic airborne contaminants.The current design procedure for these hoods relies on the concept of capture velocity outlined in several texts (Burgess et al.,1989; ACGIH,2001).Table 3-1 in the Industrial Ventilation Manual (ACGIH,2001) specifies a range of capture velocities as a function of initial contaminant momentum,or ‘condition of dispersion’ as it is identified in the table.Guidance as to the applicable portion of the range is provided based on mitigating conditions such as cross drafts,hood size,duration of contaminant generation,and toxicity.The table appears to have originated with the work of Kane (1946) and Brandt (1947).

本文介绍的数值模拟结果进行估计惯性范围（距离）的大型气溶胶粒子弹射离当地排气罩.势流理论是用来指定的空气流速沿中线的法兰圆形罩.高阶齿轮的方法是把粒子的运动方程与阻力系数的过渡范围.结果允许相对比较遮光罩性能的基础上的能源成本需要停止粒子在一个特定的距离.胡德尺寸是证明是一个关键的因素,而捕获速度所产生的遮光罩点粒子抛射是次要的.局部排气罩是一个主要工程控制保护工人免受过度暴露于有毒空气污染物.目前的设计程序,这些盖依赖的概念,捕捉速度概述一些文本（伯杰斯等人,1989；暴露现象,2001）.表3 - 1在工业通风手册（AC GIH,2001）指定范围的捕获速度作为一个功能的初步污染物的势头,或色散条件为其表中确定的.指导的适用部分的范围内提供的基础上减轻条件如跨草案,胡德大小,持续时间的污染物的产生,和毒性.表似乎起源的工作与凯恩（1946）和勃兰特（1947）.