风机阵吹风试验方法基本理论与关键技术研究

发布时间：2018-01-07 22:06

本文关键词：风机阵吹风试验方法基本理论与关键技术研究　出处：《西安建筑科技大学》2013年硕士论文　论文类型：学位论文

【摘要】：帐篷是一种便于携带，能够遮风、挡雨、保温、防寒的临时场所，既可用于军事上的野营训练和作战，也可广泛用于野外工程施工和临时住所。现阶段，帐篷结构抗风能力检测主要采用等效静力风荷载试验方法。由于现场实测数据空白，帐篷结构试验风荷载按现行规范取值，未考虑篷布与气流之间的流固耦合作用，因此检测结果的准确性值得商榷；另外，等效静力风荷载加载装置需特殊设计，，制作困难，通用性差。为此，本论文针对国内外新近出现的风机阵吹风试验方法和帐篷结构体型及其使用环境特点，展开试验环境一致性条件、风机阵试验系统设计方案和试验风环境流场品质评价方法三方面研究工作，研究成果可为我国相关部门建立此类试验系统时提供参考。本文主要研究内容和结果为： 1.基于相似理论及大气边界层理论，分析了自然环境与风机阵吹风试验环境之间的一致性条件。结果表明：与海洋工程模型试验时力学相似准则为佛劳德数不同，帐篷结构模型试验时力学相似准则主要为雷诺数；足尺试验时一致性条件为：平均风速剖面相似，湍流强度剖面相似，脉动风功率谱相似及湍流积分尺度相似。 2.完成了SFG7-4型轴流风机及XDAJ-7.1型双轴对旋射流风机外流场的实测与数值模拟分析，以及风机阵吹风试验系统方案设计工作。足尺试验时自然环境与风机阵吹风试验环境一致性条件对比分析结果表明：31台XDAJ-7.1型双轴对旋射流风机至上而下交错排列组成10-11-10的风机阵列，各风机水平、竖向中心间距均为1.10m且风机阵中心距地面高度为2.95m时，风机阵流场于10m断面处，形成了约9.0m（宽）×3.5m（高）流场特性稳定区域；与二类粗糙度地区八级风场特性要求相比，平均风速剖面平均偏差8.1%，湍流强度剖面平均偏大1.5倍，脉动风功率谱与目标谱（Karman谱）相比低频段存在一定误差，湍流积分尺度偏差为7.05%~12.9%。 3.探讨了风机阵吹风试验系统流场品质评价方法，分析了其测试技术方案，给出了衡量风机阵流场品质优劣指标的建议值。
[Abstract]:The tent is a kind of easy to carry, can shelter from the wind, rain, cold insulation, temporary sites, which can be used for military training camp and combat, also can be widely used in the field of engineering construction and temporary residence. At this stage, the tent structure wind resistance detection by test method of equivalent static wind loads. The field measured data blank, tent structure test wind load according to the current standard value, without considering the interaction between the tarpaulin and flow of fluid solid coupling, so the accuracy of test results is questionable; in addition, the equivalent static wind load loading device for special design, production difficulties, poor universality. Therefore, the wind blowing machine array test method and tent structure type this paper at home and abroad recently, and the working environment characteristics, experimental environment conditions of consistency, fan field quality evaluation method for design scheme and test flow wind environment array test system The research results can provide reference for the relevant departments of our country to establish this kind of test system. The main contents and results of this paper are as follows:
1. based on the similarity theory and boundary layer theory, analyzes the consistency condition between the natural environment and the fan array blowing test environment. The results show that the mechanical and ocean engineering model test similarity criterion for different Froude number, tent structure model test of mechanics similarity criterion mainly for Reynolds number; full-scale test conditions for consistency the average wind speed profile, turbulence intensity profile is similar to that of pulsating wind spectrum similarity and turbulence integral scale is similar.
2. completed the SFG7-4 axis simulation test and numerical analysis of rotary jet fan flow field flow fan and XDAJ-7.1 double fan array, and blowing test system design. It indicated that the natural environment and the fan array blowing test environment consistency condition comparative analysis of the results of full-scale test: 31 sets of XDAJ-7.1 double rotary jet fan down staggered fan array 10-11-10, the fan, the vertical center distance are 1.10M and fan array center height is 2.95M, the fan array flow in 10m section, the formation of about 9.0m (W) * 3.5m (high) flow characteristics of stable region compared with the two class eight grade; wind field characteristic roughness area, the average wind speed profile average deviation is 8.1%, the average turbulence intensity profile is 1.5 times the pulsating wind power spectrum and the target spectrum (Karman spectrum) compared to low frequency has certain error, turbulence integral The scale deviation is 7.05%~12.9%.
3., we discussed the quality evaluation method of the flow field test system of the fan array, analyzed the testing technology plan, and gave the recommended value to measure the quality of the flow field of the fan array.

【学位授予单位】：西安建筑科技大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TU312.1

【相似文献】