Gas And Water Two-Phase Flow Research

In order to address the actual ship gas emissions in the process of heat radiation, to reduce the risk of ship infrared tracked, it is an effective method injecting water to exhaust to reduce its temprature. In order to clarify the cooling water in the exhaust gas in the vaporization process of the impact of various parameters, in this paper, the calculation and analysis of a single drop of water particle and water mist particles into the flow field in high-temperature gas is performed.In this paper, the water quality of total percentage is less than 10 percent, so the calculation of the two-phase flow of Euler - Lagrangian is adopted. Fluids (gas) is treated as a continuous phase and Euler's method of fluid movement is used. At the same time, droplets of particles is considered as discrete phase and method of research using Lagrangian is used for particle trajectory. The coupling of Gas phase and particles is through the gas equation in the quality of the source, the source of the diversion group, the source of momentum and energy to achieve the source.After calculation, the impact of different parameters of the flue gas (gas temperature and gas rate) and different parameters of the mist (mist initial speed, temperature, diameter and water volume) on the vaporization process of mist is obtained. The impac of the speed of gas to the time of vaporization can be ignored . The higher the initial temperature of gas is , the shorter vaporization time of the water droplets is. If the flue gas temperature is increased 100℃, the flying time can drop as much as four times. Vaporization time is affected to a certain extent by the volume of water . If the water volume is less than 5 percent, vaporization time change very slow; and if the water volume is more than 5,vaporization time change very fast. Impact of droplet diameter on the vaporization of time is very large. Vaporization time increse to more than four times if the diameter is doubled. Initial temperature and initial rate of the water droplets have little impac on vaporization time on the whole,so it can be ignored.The results of this paper are important for further studies, and a theoretical foundation have been laid for the pilot study. Simulation on the jet spray nozzle at high temperature in the flue gas flow will be going on in the next step.