基于fluent的工厂自然通风设计与实现.doc

摘要
自然通风可以有效的降低工业车间的作业温度,与机械通风相比,几乎没有能源消耗且经济环保,初期投资和运行成本都远低于机械通风,通过空气对流有效的排出室内有害气体,从而极大的改善室内的作业环境。但是如何使厂房获得最大的通风效率就成为了一大课题。
本文利用CFD技术对某钢铁厂车间进行了数值模拟,根据热压和风压同时作用下的自然通风理论,使用Gambit前处理软件设计出该钢铁厂车间模型,因为厂房顶部形状不规则,网格划分采用四面体形,选择标准k-ε湍流模型、DO辐射模型和有限体积法,对该厂房的进风口、排风口等边界条件进行了设置与赋值,利用Fluent软件对该车间的自然通风情况进行了数值模拟和计算,并得到速度分布效果图与温度分布效果图,分析车间在热压作用下的自然通风规律。
通过使用控制变量法对不同工况条件下影响通风效率的因素逐一进行讨论并得出结论:在厂房几何尺寸,其他工况条件不变的情况下,通过改变进风口高度h分析其对通风效率的影响, ;通过进风口速度的结果图对比得出进风速度v越大,自然通风效果越明显;改变排风天窗的面积S时,通过对模拟图的分析得出150m2的通风天窗效果比100m2的好。适当的进风口高度h和适当的排风口面积S以及尽可能大的进风速度v能够有效的提高厂房的通风效率,对工业厂房的设计有一定的参考意义。
关键词:工业车间,自然通风,数值模拟,控制变量法
Numerical simulation of natural ventilation tall plant with heat source
Abstract
Natural ventilation can effectively reduce the operation temperature of the industrial workshop. Compared with mechanical ventilation and cooling, natural ventilation has almost no energy consumption and environmental protection, and the initial investment and operating costs are lower than mechanical ventilation. It can also make the air convection in order to discharge the harmful gas effectively and improve the indoor environment. But how to make the plant to obtain maximum ventilation efficiency has e a big problem.
This paper use CFD technology in a steel factory to simulate, based on the theory of the action of buoyancy and wind under the industrial ventilation natural ventilation .Take the k-ε turbulent model standard, DO radiation model and the finite volume method, the use of pre-processing software Gambit to design the steel factory workshop model and draw the conforming tetrahedral mesh of the workshop calculation, the air inlet and outlet boundary conditions were set with the assignment. The workshop of temperature field and velocity field were simulated and calculated by using Fluent software, to obtain the workshop of velocity distribution renderings and temperature distribution renderings.
Use the control variables in different ventilation to gain which factor is efficiency