【作者】 周代祥；

【导师】 刘光远；

【作者基本信息】 扬州大学 ， 流体机械及工程， 2008， 硕士

【摘要】 对于工业厂房类的大空间,常规设计方法很难准确分析评估其气流组织。试验研究和数值计算研究是探索气流组织的两种重要方法。试验研究方法周期长、费用多,而数值计算研究方法则不仅周期短、费用少,而且便于进行多方案的比较,由计算得到的速度场、温度场等可以用于气流组织设计。近几年来,随着计算机大容量化和高速度化以及计算流体力学的发展,应用CFD技术模拟预测高大空间建筑空调系统的气流组织以及优化设计方案成为可能。所以数值计算的研究方法得到了越来越多的应用。本文采用三维定常Navier-Stokes方程组和k ?ε紊流模型,对厂房的气流组织进行了数值模拟。论文通过对比分析厂房实际测定数据与数值模拟结果,验证了CFD方法的可行性与结果的可靠性;为了优化厂房的气流组织,提出了九种不同方案,首先用数值模拟的方法得出气流速度场云图,优选出三种方案,再次通过对这三种方案进行模型试验,测得相应速度场数据,运用气流不均匀系数作评价指标,对结果进行分析与对比,得到最优方案,探索出相应的优化规律。长期以来,我国大空间气流组织的设计都凭经验进行,在设计规范中尚未提出具体量化的要求。本文实现了大空间气流组织的数值模拟,并通过了试验的方法验证了数值计算的结果,这就为以断面不均匀系数作为评价气流主旨的设计标准提供了可能,可供今后的设计参考。更多还原

【Abstract】 Common design methods can not be used to analyze and assess airflow accurately in large space buildings such as industry workshop. Experimental study and numerical simulation study are two most important methods to explore the principle of air distribution. Experimental study needs relatively long cycle and much running cost, but numerical simulation study not only needs short cycle and little running cost but also can be convenient to carry on the comparison of the multi-plans. It may improve the design of the concentration field with the velocity field and temperature concentration field that is gotten from the numerical simulation. In recent years, with the development of computer industry and Computational airflow thermal Dynamics, it becomes possible to simulate and predict air distribution, so numerical simulation study is being more and more applied.This article uses the three dimensional steady Navier-Stokes equations and turbulent flow model, carries on the value simulation of air current organization of workshop. The paper makes a contrast analysis on the actual measured data and the analogue of workshop ,confirms the feasibility of the CFD method and the reliability of result ; In order to optimize the air current organization of the workshop, proposes nine kinds of different plans, Firstly, uses the value simulation method to obtain the chart of air flow field cloud , selects the optimal three kinds of plans, secondly, through carrying on the model experiment by these three kind of plans, measures the data of the corresponding velocity field, makes the air current nonuniformity coefficient as the appraisal target, carries on an analysis and a contrast to the result, obtains the optimal plan, explores the corresponding optimized rule.For years, design of air distribution of large space buildings is based upon experience, and there are no special quantitative requirements in the code. The essay achieves the simulation of the air distribution of large space buildings with CFD and proves the conclusion of the simulation through tests: therefore it provides the feasibility to evaluate the design standard of air distribution in large space buildings by means of the not even coefficient and may serve as a reference to the design of large space buildings.更多还原