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摘要:
利用计算流体力学（CFD）方法建立了模拟龙卷风的装置模型。基于龙卷风在平面上的速度型，拟合成函数关系式，在三维CFD程序中设置初始速度场以及相关的边界条件，匹配不同的初始温度场进行了关于龙卷风维持和发展的一系列数值模拟。重现并利用漩涡管的Ranque-Hilsch效应以及汇流换热原理分析了本文2种不同的温度型对龙卷风内部流场变量随时间推移所发生的变化，同时揭示了龙卷风产生并维持下去的一种可能性，即冷热气流汇流换热生成温度场可能是产生和维持龙卷风的直接原因，并在此基础上提出使龙卷风削弱甚至消亡的方法，即破坏温度场。
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关键词:
- 计算流体力学(CFD) /
- 龙卷风 /
- 数值模拟 /
- 汇流换热原理 /
- 温度场
Abstract:A numerical model of the tornado was established by using computational fluid dynamics (CFD) method. Based on the speed type of the tornado in the plane, which was fitted to be the function relation, the initial velocity field and the related boundary condition were set in the 3D CFD program. Different initial temperature fields were carried out on a series of numerical simulations of tornado maintenance and development. The Ranque-Hilsch effect of the whirlpool and the convergence heat transfer principle were used to analyze the changes of the internal flow field variables of the two different temperature types in the tornado. It reveals the possibility of how the tornado was produced and continued, that is, the hot and cold air flow mixing and heat transfer which generated a temperature field may be the direct cause for producing and continuing a tornado. And a method to make tornado weak or even disappear was proposed, that is, destroying the temperature field.
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图 3 不同计算步数下的速度变化曲线(算例1)
Figure 3. Velocity variation curves under different calculation steps (Case 1)
图 4 不同计算步数下的温度变化曲线(算例1)
Figure 4. Temperature variation curves under different calculation steps (Case 1)
图 5 不同计算步数下的压力变化曲线(算例1)
Figure 5. Pressure variation curves under different calculation steps (Case 1)
图 6 不同计算步数下的密度变化曲线(算例1)
Figure 6. Density variation curves under different calculation steps (Case 1)
图 7 不同计算步数下的速度变化曲线(算例2)
Figure 7. Velocity variation curves under different calculation steps (Case 2)
图 9 不同计算步数下的温度变化曲线(算例2)
Figure 9. Temperature variation curves under different calculation steps (Case 2)
图 10 不同计算步数下的压力变化曲线(算例2)
Figure 10. Pressure variation curves under different calculation steps (Case 2)
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