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本文研究了水电站厂房这种特殊的自然通风系统的模型实验.通过对流动的分析、应用基本相似原理和经典流体动力学理论,提出了一种用相似准则的物理意义代替其定义来计模型的新方法,推导出一个近似真实相似条件:(1)单值性条件相似,(其中温度和热流看,后者是主要考虑的因索)(2)流动是紊流.导出了两个相似不变量用了变异了单值性条件的畸变相似方法,分析了畸变效应,并做了削弱的措施.实验是对三个模型进行的,结果证实了近似真实相似条件,并说明了畸变效应很微弱.
This paper studies the model experiment of the special natural ventilation system of the hydropower plant. Through the analysis of the flow, the application of the basic similarity principle and the classical fluid dynamic theory, a method is proposed to replace the model with the physical meaning of a similar criterion. The new method derives an approximate real similarity condition: (1) The conditions of singular value are similar, (in which the temperature and heat flow look, the latter is the main consideration of the cable). (2) The flow is turbulent. Two similarities are derived. The variable uses a distortion similarity method that mutates the single-valued condition, analyzes the distortion effect, and does a measure of weakening. The experiment is performed on three models. The result confirms the approximation of the true similarity condition and shows that the distortion effect is very weak. .