多组分气体传质简化模型理论分析及数值验证

Theoretical analysis and numerical verification of simplified masstransport model for multi-component gas

为明确厂房内污染气体的分布特征,高效控制工业建筑环境,研究分析多种气态污染物与单一气态污染物分布特征间的区别及简化条件,明确同源同时散发的多组分混合气体的运输特性,揭示全尺度中多组分混合气体传质简化的可行性范围及需遵循的原则,并通过数值模拟验证结论的有效性。结果表明:多组分气体传质简化模型的适用范围为:同源散发的混合气体在无相变和化学反应时,其流动参数雷诺数Re量级在103以上,且马赫数Ma<0.3时,物性参数在克努森数Kn<0.01且温度在0.3倍的振动特征温度θv和沸腾温度T'之间,可简化组分进行污染物分布特征研究;简化偏差源于简化前后单位质量混合气体体积力之差(ΔF),简化时需保障ΔF与主要驱动力之比小于0.01;理论模型的适用范围及简化原则与模拟结果相符,证明在适用范围内满足简化原则的条件下,可以将多种气态污染物简化为单一种类探究污染物分布特征。

In order to explicit the distribution characteristics of polluted gases in factory buildings and realize efficient control of industrial building environments,the study analyzed the differences and simplification conditions between the distribution characteristics of multiple gaseous pollutants and single gaseous pollutants,clarified the transportation characteristics of multi-component mixed gases emitted simultaneously from the same source,revealed the feasibility range and principles to be followed for mass transfer simplification of multi-component mixed gases in full scale,and verified the validity of the conclusion through numerical simulation.The results show that the applicable range of the multi-component gas mass transfer simplification model is as follows:when the mixed gas emitted from the same source has no phase change and chemical reaction,and its flow parameter Reynolds number Re is above 103 and Mach number Ma<0.3,and the physical property parameters are within the range of Knudsen number Kn<0.01 and temperature between 0.3 Characteristic vibrational temperatureθv and T',the components can be simplified for studying the distribution characteristics of pollutants.The simplified deviation stems from the difference in volume force per unit mass of the mixed gas before and after simplification(ΔF).When simplifying,it is necessary to ensure that the ratio ofΔF to the main driving force is less than 0.01.The theoretical model's application range and simplification principle agree with the simulation results.It is proved that a variety of gaseous pollutants can be simplified into a single type under the condition that the simplification principle is met within the applicable scope to explore the distribution characteristics of pollutants.