【作者】 李茜；

【导师】 秦萍；

【作者基本信息】 西南交通大学 ， 供热、供燃气、通风及空调工程， 2005， 硕士

【摘要】 无风管诱导通风系统起源于瑞典ABB公司1974年发明的风管型喷嘴诱导通风和空调系统(DIRVEN7 SYSTEM)。1999年,该公司控股的日本富列克特公司,研制出TOPVEN72 SYSTEM射流诱导通风系统,并于2000年进入中国市场。由于这种新型的通风方式,对地下车库通风,较之传统的通风系统,具有一系列的优点,很快在中国各地得到应用。但是,由于进入中国的时间较短,尽管已有不少应用实例,无风管诱导通风系统不论在设计方法还是通风效果上,都缺乏相关的理论验证。 本文首先对成都某地下车库采用无风管诱导通风时的气流组织利用CFD技术进行模拟分析。模拟以工程中广泛使用的k—ε紊流模型为基础,选用控制容积法,对方程组进行了离散,用SIMPLE算法求解方程组,利用CFD计算软件得出车库的流场分布。针对原设计出现一定程度的新风短路、诱导风机没能充分发挥作用的现象,又设计了五组算例,来分析无风管诱导通风系统的特点和适用条件。算例通过变换送排风口的相对位置、喷嘴射流的角度、送排风机压差引起的主气流和诱导风机射流气流的相对关系等,寻找保证理想诱导通风效果需要的条件,总结无风管诱导通风系统的设计和运行规律。在此基础上,对原车库的无风管诱导通风系统提出两种改进方案。通过对改进方案的速度场和CO浓度场模拟计算和分析,证明无风管诱导通风系统能达到非常好的通风效果,并对无风管诱导通风系统的设计和运行提供了一些理论依据和建议。更多还原

【Abstract】 The no-duct inductive ventilation system originate from the duct spray nozzle inductive ventilation and air conditioning system, which was advanced by Swedish ABB Company in 1974 and named as DIRVENT SYSTEM. In 1999, its branch company in Japan, FLAKE company, developed the third system, T0PVENT2 SYSTEM, which was introduced and marketed into China in 2000. TOPVENT2 SYSTEM, as a new-type airing manner, has obvious superiority than traditional ventilation system of the underground parking, and was applied in many parts of the country. Since TOPVENT2 SYSTEM marched into China market only few years, there are many engineering examples, but no matter design method or ventilation effectiveness is lack of theoretic proof.This paper adopts the theory of Computational Fluid Dynamic (CFD) to first make numeral simulation analyses of the air distribution for an underground park in Chengdu where TOPVENT2 SYSTEM is adopted in this paper. The simulations on basis of the k- ε two-equation turbulent model which is widely used in engineering, were made by the method of control cubage . Discrete equation solved systems with the SIMPLE algorithm, and drew the velocity and the CO density distributions in the underground park. Aim at the the fresh air short. circuit that the original design appears the certain degree and that the T0PVENT2 did not can produce result well, and then designed five the sets calculate the example. In these test examples, in order to find the factors which can improve the ventilation effectiveness, to summarize the general realized method for the design and operation, writer varied the relative position between air-feeding ventilator and air-exhausting ventilator; adjusted the outlet angle of discharge jet; issued the interact of airflows caused by the differential pressure between air-feeding ventilator and air-exhausting ventilator or caused by discharge jet. Based on these results, write pointed out two improved design plans and analyses them using CFD method samely. The velocity field and the CO density field distributions for two improved systems, proved that the no-duct inductive ventilation system in ventilation system of the underground park has wonderful effectiveness. The analysis method and results presented at last of this更多还原