静风条件下船舶烟气扩散特性及对进风口影响的数值分析  

Numerical analysis of ship flue gas diffusion characteristics and influence on air intake under calm weather

作　　者：庄晓东 侯佳鑫 谢军龙[1] 段梅子 ZHUANG Xiaodong;HOU Jiaxin;XIE Junlong;DUAN Meizi(School of Energy and Power Engineering,Huazhong University of Science and Technology,Wuhan 430074,China)

机构地区：[1]华中科技大学能源与动力工程学院,湖北武汉430074

出　　处：《中国舰船研究》2021年第S01期61-69,共9页Chinese Journal of Ship Research

摘　　要：[目的]为避免船舶烟气污染甲板及进风口,分析烟气扩散特性以探究其给船舶带来的污染。[方法]首先,采用计算流体力学(CFD)方法建立烟气扩散模型,并引入统计性能指标进行评价和验证该模型的准确性;然后,在此基础上研究静风环境下烟气释放温度对船舶烟气扩散过程的影响,了解烟气沉降与扩散过程的机理;最后,分析烟气对船舶进风口的影响。[结果]结果显示,烟气释放温度会决定烟气由重气云向中性气云的转变过程,从而决定扩散/沉降的作用;由于静风环境下烟气为垂直扩散,所以污染集中在船舶舯部;当烟气释放温度约达417 K时,烟气将不再发生明显的沉降,而是直接扩散至常温环境中。[结论]研究结果可为船舶排气参数设计及进风口布置提供理论依据。[Objective]In order to prevent flue gas from polluting the ship deck and air intake, a numerical analysis of flue gas diffusion characteristics is carried out. [Methods]First, a flue gas diffusion model is established using the computational fluid dynamics(CFD) method, and statistical performance indicators are introduced to evaluate and verify the accuracy of the model. On this basis, the effect of exhaust temperature on the flue gas diffusion process in a static wind environment is studied in order to understand the mechanisms of the flue gas deposition and diffusion processes, and the influence of flue gas on the ship’s air intake is further analyzed. [Results]The results show that the exhaust temperature determines the transition process of flue gas from a heavy gas cloud to a neutral gas cloud, thereby determining the diffusion/sedimentation effect. As flue gas diffuses vertically in static windy environment, the pollution is concentrated in the middle of the ship;when the exhaust temperature reaches 417 K, the flue gas will not settle significantly but directly diffuse into the normal temperature environment. [Conclusion]The results of this study can provide a theoretical basis for the design of ship exhaust parameters and air intake layout.

关 键 词：船舶排气 静风 进风口 CO_(2) 重气扩散 

分 类 号：U661.1[交通运输工程—船舶及航道工程]