外部气流影响下的船舶通风口烟气扩散试验

为预先确定船舶初步设计中的通风口系统在外部气流场作用下的排气效果，找出设计方案在通风口排气方面存在的问题，采用计算流体力学（Computational Fluid Dynamics，CFD）和风道试验的方法进行研究。以外部气流作用下的通风口烟气扩散试验为研究对象，建立含通风口边界条件的风道三维网格模型，求解不同气体流速下的黏性不可压缩定常流动。计算不同外部气流速度下和不同通风口布局下排气中的CO2分布扩散情况，结果表明来流速度增大会加快CO2体积分数沿流向的衰减速率，削弱CO2横向扩散程度。根据试验结果验证计算的准确性，证明应用CFD技术可评估通风口布局的优劣。

Flue Gas Diffusion Test of Ship Air Vent Under Influence of External Airflow

In order to determine the exhaust gas effect of air vent system under the action of external airflow field in the preliminary design of a ship in advance and find out the problems in the air vent exhaust gas of design scheme, the research is conducted with the methods of Computational Fluid Dynamics (CFD) and air duct test. Taken the air vent flue gas diffusion test under the action of external airflow as the research object, a three-dimensional air duct grid model with air vent boundary conditions is established to solve the viscous incompressible steady flow at different exhaust gas velocity. The distribution and diffusion of CO2 in the exhaust gas under different external airflow velocities and different air vent layouts are calculated, and the results show that the increase of incoming airflow velocity can accelerate the attenuation rate of CO2 volume fraction along the airflow direction and weaken lateral CO2 diffusion degree. The calculation accuracy is verified according to the test results, which proves that the advantages and disadvantages of air vent layout can be evaluated with the CFD technology.