考虑近地风湍流的球面屋盖雷诺数效应研究
发布时间：2018-08-19 21:07
【摘要】：雷诺数效应是指在不同雷诺数下钝体绕流的流动模式发生改变,进而使钝体表面风荷载发生变化的现象,是结构风工程领域的重要基础性问题。目前关于雷诺数效应的研究仍处于理论探索阶段;研究对象为均匀流场下的圆柱、柱面屋盖,关于其它曲面屋盖的研究较少;研究内容多关注的是结构表面平均风压系数、风力系数等气动参数随雷诺数的变化规律,针对脉动风压场及旋涡作用的研究较少,而湍流场下的雷诺数效应更鲜有研究。本文以1/4矢跨比球面屋盖为研究对象,在均匀流场和湍流场下开展了系列变雷诺数测压试验,侧重研究在湍流场下球壳雷诺数效应的表现,主要内容包括:(1)开展了均匀流及大气边界层湍流下1/4矢跨比球面屋盖的变雷诺数风洞测压试验。为拓展风洞试验中雷诺数区间的范围(均匀流场雷诺数区间为8.48×104~2.06×106,湍流场雷诺数区间为9.66×104~1.38×106),采用三种不同尺度模型进行试验,并通过与文献结果进行对比验证数据的合理性。(2)总结整理了雷诺数效应研究中两个关键问题的研究方法,即雷诺数转捩区间的确定及基于分解技术(本征正交分解POD、谱正交分解SPT)研究旋涡的作用。(3)基于风压分布、风力系数、压力梯度等气动参数随雷诺数的变化规律确定雷诺数转捩区间,均匀流场转捩区上限为2.48×105,边界层湍流场为2.07×105。通过对比均匀流场及湍流场下的结果探讨流场湍流对雷诺数效应的影响。(4)通过频谱分析,考察不同雷诺数、不同流场条件下,风压谱与风力谱的变化规律,重点探讨球面不同位置测点风压谱峰值的分布规律,研究表明在雷诺数转捩区间也存在风压谱及风力谱形状的突变,意味着能量由低频向高频转移。(5)基于POD分解获得脉动风压场主导本征模态及其与顺风向阻力作用及竖向升力作用的关系,进一步基于SPT的谱正交分解获得主导频率下的旋涡作用特点,并建立起与脉动风压特性的联系,对脉动风压特性作出更合理的机理性解释。
[Abstract]:Reynolds number effect refers to the phenomenon that the flow mode of bluff body changes under different Reynolds numbers and the wind load changes on the surface of the bluff body. It is an important basic problem in the field of structural wind engineering. At present, the research on Reynolds number effect is still in the stage of theoretical exploration; the research object is the cylinder under uniform flow field, the cylindrical roof, and the other curved roof, and the research focus is on the average wind pressure coefficient of the structure surface. The variation of aerodynamic parameters such as wind force coefficient with Reynolds number is less studied on pulsating wind pressure field and vortex effect than on Reynolds number effect in turbulent field. In this paper, a series of variable-Reynolds number pressure measurement experiments are carried out on the spherical roof with a ratio of 1 / 4 rise-to-span ratio under the uniform flow and turbulent field, with emphasis on the performance of the Reynolds number effect of the spherical shell in the turbulent field. The main contents are as follows: (1) the wind tunnel pressure measurement experiments of 1 / 4 rise-to-span ratio spherical roof with uniform flow and atmospheric boundary layer turbulence are carried out. In order to expand the range of Reynolds number range in wind tunnel test (8.48 脳 10 ~ 4 脳 10 ~ 4 ~ 2. 06 脳 10 ~ 6 for uniform flow field and 9.66 脳 10 ~ 4 ~ (4) ~ (1.38 脳 10 ~ 6) in turbulent field), three different scale models are used. The rationality of the data is verified by comparing with the results of literature. (2) the research methods of two key problems in the study of Reynolds number effect are summarized and sorted out. That is, the determination of transition interval of Reynolds number and the study of vortex action based on decomposition technique (eigenorthogonal decomposition POD, spectral orthogonal decomposition SPT). (3) based on wind pressure distribution, wind coefficient, The Reynolds number transition interval is determined by the variation of aerodynamic parameters such as pressure gradient with Reynolds number. The upper limit of transition region of uniform flow field is 2.48 脳 10 ~ 5 and the turbulent field of boundary layer is 2.07 脳 10 ~ 5. The effect of turbulent flow on Reynolds number effect is discussed by comparing the results of uniform flow field and turbulent flow field. (4) the variation of wind pressure spectrum and wind energy spectrum under different Reynolds numbers and different flow fields is investigated by spectrum analysis. The distribution law of peak value of wind pressure spectrum at different points of spherical surface is discussed. It is shown that there are also abrupt changes in wind pressure spectrum and shape of wind pressure spectrum in the transition region of Reynolds number. This means that the energy is transferred from low frequency to high frequency. (5) based on POD decomposition, the dominant intrinsic modes of pulsating wind pressure field and their relationship with downwind resistance and vertical lift are obtained. Based on the spectral orthogonal decomposition of SPT, the vortex action characteristics at dominant frequency are obtained, and the relationship between vortex action and pulsating wind pressure characteristics is established, and a more reasonable mechanism explanation of pulsating wind pressure characteristics is made.
【学位授予单位】：哈尔滨工业大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TU312.1
本文编号：2192831
[Abstract]:Reynolds number effect refers to the phenomenon that the flow mode of bluff body changes under different Reynolds numbers and the wind load changes on the surface of the bluff body. It is an important basic problem in the field of structural wind engineering. At present, the research on Reynolds number effect is still in the stage of theoretical exploration; the research object is the cylinder under uniform flow field, the cylindrical roof, and the other curved roof, and the research focus is on the average wind pressure coefficient of the structure surface. The variation of aerodynamic parameters such as wind force coefficient with Reynolds number is less studied on pulsating wind pressure field and vortex effect than on Reynolds number effect in turbulent field. In this paper, a series of variable-Reynolds number pressure measurement experiments are carried out on the spherical roof with a ratio of 1 / 4 rise-to-span ratio under the uniform flow and turbulent field, with emphasis on the performance of the Reynolds number effect of the spherical shell in the turbulent field. The main contents are as follows: (1) the wind tunnel pressure measurement experiments of 1 / 4 rise-to-span ratio spherical roof with uniform flow and atmospheric boundary layer turbulence are carried out. In order to expand the range of Reynolds number range in wind tunnel test (8.48 脳 10 ~ 4 脳 10 ~ 4 ~ 2. 06 脳 10 ~ 6 for uniform flow field and 9.66 脳 10 ~ 4 ~ (4) ~ (1.38 脳 10 ~ 6) in turbulent field), three different scale models are used. The rationality of the data is verified by comparing with the results of literature. (2) the research methods of two key problems in the study of Reynolds number effect are summarized and sorted out. That is, the determination of transition interval of Reynolds number and the study of vortex action based on decomposition technique (eigenorthogonal decomposition POD, spectral orthogonal decomposition SPT). (3) based on wind pressure distribution, wind coefficient, The Reynolds number transition interval is determined by the variation of aerodynamic parameters such as pressure gradient with Reynolds number. The upper limit of transition region of uniform flow field is 2.48 脳 10 ~ 5 and the turbulent field of boundary layer is 2.07 脳 10 ~ 5. The effect of turbulent flow on Reynolds number effect is discussed by comparing the results of uniform flow field and turbulent flow field. (4) the variation of wind pressure spectrum and wind energy spectrum under different Reynolds numbers and different flow fields is investigated by spectrum analysis. The distribution law of peak value of wind pressure spectrum at different points of spherical surface is discussed. It is shown that there are also abrupt changes in wind pressure spectrum and shape of wind pressure spectrum in the transition region of Reynolds number. This means that the energy is transferred from low frequency to high frequency. (5) based on POD decomposition, the dominant intrinsic modes of pulsating wind pressure field and their relationship with downwind resistance and vertical lift are obtained. Based on the spectral orthogonal decomposition of SPT, the vortex action characteristics at dominant frequency are obtained, and the relationship between vortex action and pulsating wind pressure characteristics is established, and a more reasonable mechanism explanation of pulsating wind pressure characteristics is made.
【学位授予单位】：哈尔滨工业大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TU312.1
【参考文献】
相关期刊论文 前1条
1 刘健新;崔欣;李加武;;桥梁断面表面压力分布及Strouhal数的雷诺数效应[J];振动与冲击;2010年04期
相关硕士学位论文 前4条
1 丁思华;近地湍流被动模拟实验技术研究[D];哈尔滨工业大学;2013年
2 刘也;柱面屋盖雷诺数效应研究[D];哈尔滨工业大学;2012年
3 张超东;大跨度柱面屋盖结构风荷载特性研究[D];哈尔滨工业大学;2011年
4 邱冶;大矢跨比球壳的风荷载特性研究[D];哈尔滨工业大学;2010年
，本文编号：2192831
本文链接：https://www.wllwen.com/jingjilunwen/jianzhujingjilunwen/2192831.html
