CAJ | 학술논문

该文考虑液滴的碰撞和破碎以及水平和下旋气流的影响，采用离散相模型对空中释放的气溶胶云团在开放空间中的气液两相流流场进行仿真，获得气溶胶颗粒群的运动规律，并进行了实验验证。由仿真模拟和实验可知，在水平和下旋气流速度均较小(小于1 m/s)、喷射角度大于30°、初始粒径为100μm、喷射速度约为80 m/s时，释放形成的气溶胶颗粒在短时间内可沉降至地面附近；当水平气流速度增大至3m/s时，同样条件下释放的气溶胶颗粒更容易在空气中悬浮，不易沉降至地面。在上述两种情况下，喷射角度和下旋气流速度越大，气溶胶颗粒越容易沉降至地面附近。
해문고필액적적팽당화파쇄이급수평화하선기류적영향，채용리산상모형대공중석방적기용효운단재개방공간중적기액량상류류장진행방진，획득기용효과립군적운동규률，병진행료실험험증。유방진모의화실험가지，재수평화하선기류속도균교소(소우1 m/s)、분사각도대우30°、초시립경위100μm、분사속도약위80 m/s시，석방형성적기용효과립재단시간내가침강지지면부근；당수평기류속도증대지3m/s시，동양조건하석방적기용효과립경용역재공기중현부，불역침강지지면。재상술량충정황하，분사각도화하선기류속도월대，기용효과립월용역침강지지면부근。
Considering the droplets collision-breakup model and the effects of horizontal and downward airflow,the flow of aerosol released from the air to the open environment is investigated numerically by applying the discrete phase model of the gas-liquid two-phase flow. The motion char-acteristics of aerosol droplets in open environment are obtained and verified by experiments. The numerical and experimental results show that when the velocities of the horizontal and downward airflow are both small(less than 1 m/s),the ejecting angle is larger than 30°,the initial size of the particles is 100 μm, and the ejecting speed is about 80 m/s, the generated aerosol particles sedimentate to the ground in a short time. When the velocity of the horizontal airflow reaches 3 m/s, aerosol particles released under the same conditions show more difficulty to fall to the ground. In the two above cases,increasing the ejecting angle or the downward airflow velocity can make the aerosol particles sedimentate to the ground more easily.