圆管型介质阻挡放电臭氧产生过程中的传热数值模拟

Numerical Simulation of Heat Transfer in Ozone Generation Using Coaxial Cylinders Dielectric Barrier Discharge

在介质阻挡放电臭氧产生过程中,电能大部分以热能的形式散发,且气体温度是决定臭氧产率和浓度的重要参数之一。受到研究手段和检测仪器精度的限制,关于能量转化和热量传递机理的实验研究难以开展。为此,首次采用数值模拟方法对介质阻挡放电臭氧放电室进行传热分析,并实验验证了该方法的可行性。模拟结果表明:气体温度从高压电极到玻璃介质逐渐降低,气体平均温度在短时间内快速上升后逐渐降低,而且冷却水进口温度、冷却水流量和冷却水通道宽度均对气体温度影响显著。研究结果能为气体温度的控制以及臭氧发生器的设计提供科学依据。

In the process of ozone generation by dielectric barrier discharge（DBD）,most of electric energy is emitted in the form of heat energy.Moreover,the temperature of gas is one of the most important parameters which infect ozone productivity and concentration.Due to the restriction of study method and accuracy of detecting instrument,it is difficult to experimentally study energy transformation and heat transfer.Therefore,we analyzed the heat transfer of ozone discharge chamber via DBD through the method of numerical simulation.Meanwhile,the feasibility of the method was checked by experiment.The results of simulation show that the temperature of gas is gradually reduced from high-voltage electrode to glass dielectric,the mean temperature of gas rises rapidly along axial distance in a shot time then gradually drops,at the same time,the inlet temperature,flow of cooling water and the width of cooling water channel remarkably affect gas temperature.The results of study would provide scientific evidences for the control of gas temperature and the design of ozone generator.