针对发动机排气喷雾降温问题，基于气-粒两相流理论建立了排气系统内喷雾降温的数学模型，用计算流体动力学方法进行数值模拟，揭示雾滴运动规律和排气降温规律，分析喷雾参数对发动机排气喷雾降温效果的影响。研究发现，喷雾流量、喷雾锥角和雾滴平均直径对排气喷雾降温的影响较大，雾滴的初始温度、最大直径及其尺寸分布的均匀度指数等因素对排气喷雾降温影响较小；提高发动机排气喷雾降温效果，需要将雾滴尺寸控制在一定的分布范围之内，而不能一味减小雾滴平均直径。数值模拟结果与实验结果符合较好。
For the problem of water spraying into the high temperature of the engine exhaust gas, the mathematical model was proposed based on the gas-particle two-phase flow theory, and the numerical simulation was performed using CFD method. The movement law of the water droplets and the cooling law of the exhaust gas were obtained. And the influences of the water spray parameters on the gas outlet temperature were investigated. It is found that the droplet mean diameter, the flow rate and the spray angle of the nozzle have a strong influence on the gas spray cooling, while the initial temperature, the maximal diameter and the size dispersion coefficient of the droplet is not evident. For the purpose of promoting the gas spray cooling effect, the droplet size distribution should be in an appropriate range, while the droplet mean diameter should not be decreased blindly. The predicted results are in good agreement with the experimental results.
2018,40(11): 104-107 收稿日期：2018-08-28
DOI：10.3404/j.issn.1672-7649.2018.11.020
分类号：TK414
基金项目：国家部委基金资助项目（101050202）
作者简介：袁江涛(1980-),男,博士,讲师,主要研究方向为舰船动力工程
参考文献：
[1] SCHLEIJPEN H M A, NEELE F P. Ship exhaust gas plume cooling[J]. SPIE, 2004, 5431(66):66-76.
[2] BIRK A M, DAVIS W R. Suppressing the infrared signature of marine gas turbines[J]. J. Eng. for gas turbines and power, 1989, 111(1):123-129.
[3] SCOTT R. Boosting the staying power of the non-nuclear submarine:Air-independent propulsion system options are maturing[J]. Janes international defense review, 1999, 32(11):41-50.
[4] 袁江涛, 杨立, 金仁喜, 等. 动力排气系统细水雾蒸发冷却试验研究[J]. 工程热物理学报, 2010, 31(3):461-464.
[5] 周力行. 多相湍流反应流体力学[M]. 北京:国防工业出版社, 2002.
[6] 曹建明. 喷雾学[M]. 北京:机械工业出版社, 2005.
