钝体绕流场吸气控制机理试验研究
发布时间：2018-12-10 13:57
【摘要】：随着社会经济的不断发展,超高层建筑正进入一个蓬勃发展的新时期。伴随着超高层建筑高度的不断增加,结构本身将变得更柔,对风荷载也更加敏感。因此,如何有效降低超高层建筑所受到的风荷载进而减小结构的风致振动响应对于超高层建筑的抗风设计来说意义重大。采用主动吸气控制的方法可以有效降低超高层建筑的风荷载,改善结构的抗风性能。关于吸气控制,前人的研究主要关注的是吸气控制效果以及各控制参数的影响,而对吸气控制机理的探讨还不够深入。此外,现有的研究主要针对有限长模型进行吸气控制,由于边界层来流的非均匀性、钝体绕流的三维流效应、以及吸气孔布置的空间不均匀性等多种因素的存在,将导致吸气控制的影响因素众多,吸气控制机理十分复杂。因此,为深入探讨钝体绕流场及气动力的吸气控制机理,应针对二维模型进行精细化研究。本文基于PIV技术对3类截面形式钝体模型的吸气控制机理进行了深入分析,并通过与实验结果的比较,验证了CFD数值模拟方法的准确性。所进行的主要工作如下:1、对已有的模型内部吸气管道进行了改良,以实现更为均匀的吸气控制。设计了3类截面形式(方形、圆形和椭圆形)共8个钝体试验模型及其风洞试验方案。此外,基于大涡模拟(LES)方法建立了圆形截面钝体模型吸气控制的CFD数值模拟方法,并对该方法进行了网格相关性检验与实验验证。2、完成了3类截面形式钝体模型的二维测压试验与PIV试验,研究了吸气孔位置与吸气流量系数Cq对模型表面风压分布、整体气动力系数以及周围流场特性的影响,并基于PIV试验所给出的流场可视化结果对吸气控制机理进行了深入分析。3、对风洞试验中圆形截面钝体模型的典型工况进行了准二维CFD数值模拟,并将数值结果与风洞试验结果进行对比分析。然后基于此方法从模型表面压力分布、整体气动力系数以及周围流场特性三个方面研究了吸气流量系数Cq与吸气孔宽度d对吸气控制效果的影响。
[Abstract]:With the continuous development of social economy, super-high-rise buildings are entering a new period of vigorous development. With the increasing height of super-tall buildings, the structure itself will become softer and more sensitive to wind load. Therefore, how to effectively reduce the wind load on super-tall buildings and then reduce the wind-induced vibration response of structures is of great significance to the anti-wind design of super-high-rise buildings. The method of active inspiratory control can effectively reduce the wind load of super tall buildings and improve the wind resistance of the structures. As for inspiratory control, previous researches mainly focus on the effect of inspiratory control and the influence of control parameters, but the mechanism of inspiratory control is not sufficiently discussed. In addition, the existing studies mainly focus on the finite length model of inspiratory control, due to the inhomogeneity of the boundary layer flow, the three-dimensional flow effect around the blunt body, and the spatial inhomogeneity of the air suction hole arrangement, and so on. The inspiratory control mechanism is very complicated. Therefore, in order to study the suction control mechanism of the flow field and aerodynamic force around the blunt body, the two-dimensional model should be studied in detail. In this paper, the inspiratory control mechanism of three types of blunt body models with cross-section is deeply analyzed based on PIV technique, and the accuracy of CFD numerical simulation method is verified by comparing with the experimental results. The main work is as follows: 1. The existing model internal suction pipe is improved to achieve a more uniform inspiratory control. Eight blunt body test models and their wind tunnel test schemes were designed for three types of sections (square, circular and elliptical). In addition, based on the large eddy simulation (LES) method, the CFD numerical simulation method for inspiratory control of the obtuse body model with circular section is established, and the mesh correlation test and experimental verification are carried out. 2. Two-dimensional pressure measurement and PIV tests of three types of blunt body models with cross section have been completed. The effects of suction hole location and suction flow coefficient (Cq) on the wind pressure distribution on the surface of the model, the overall aerodynamic coefficient and the flow field characteristics around the model have been studied. Based on the visualization results of the flow field obtained from the PIV test, the suction control mechanism is deeply analyzed. 3. The quasi-two-dimensional CFD numerical simulation of the typical working conditions of the obtuse body model with circular section in the wind tunnel test is carried out. The numerical results are compared with the results of wind tunnel test. Based on this method, the effects of suction flow coefficient (Cq) and suction hole width (d) on suction control effect are studied from three aspects: surface pressure distribution, global aerodynamic coefficient and flow field characteristics around the model.
【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】：2017
【分类号】：TU973.213
本文编号：2370693
[Abstract]:With the continuous development of social economy, super-high-rise buildings are entering a new period of vigorous development. With the increasing height of super-tall buildings, the structure itself will become softer and more sensitive to wind load. Therefore, how to effectively reduce the wind load on super-tall buildings and then reduce the wind-induced vibration response of structures is of great significance to the anti-wind design of super-high-rise buildings. The method of active inspiratory control can effectively reduce the wind load of super tall buildings and improve the wind resistance of the structures. As for inspiratory control, previous researches mainly focus on the effect of inspiratory control and the influence of control parameters, but the mechanism of inspiratory control is not sufficiently discussed. In addition, the existing studies mainly focus on the finite length model of inspiratory control, due to the inhomogeneity of the boundary layer flow, the three-dimensional flow effect around the blunt body, and the spatial inhomogeneity of the air suction hole arrangement, and so on. The inspiratory control mechanism is very complicated. Therefore, in order to study the suction control mechanism of the flow field and aerodynamic force around the blunt body, the two-dimensional model should be studied in detail. In this paper, the inspiratory control mechanism of three types of blunt body models with cross-section is deeply analyzed based on PIV technique, and the accuracy of CFD numerical simulation method is verified by comparing with the experimental results. The main work is as follows: 1. The existing model internal suction pipe is improved to achieve a more uniform inspiratory control. Eight blunt body test models and their wind tunnel test schemes were designed for three types of sections (square, circular and elliptical). In addition, based on the large eddy simulation (LES) method, the CFD numerical simulation method for inspiratory control of the obtuse body model with circular section is established, and the mesh correlation test and experimental verification are carried out. 2. Two-dimensional pressure measurement and PIV tests of three types of blunt body models with cross section have been completed. The effects of suction hole location and suction flow coefficient (Cq) on the wind pressure distribution on the surface of the model, the overall aerodynamic coefficient and the flow field characteristics around the model have been studied. Based on the visualization results of the flow field obtained from the PIV test, the suction control mechanism is deeply analyzed. 3. The quasi-two-dimensional CFD numerical simulation of the typical working conditions of the obtuse body model with circular section in the wind tunnel test is carried out. The numerical results are compared with the results of wind tunnel test. Based on this method, the effects of suction flow coefficient (Cq) and suction hole width (d) on suction control effect are studied from three aspects: surface pressure distribution, global aerodynamic coefficient and flow field characteristics around the model.
【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】：2017
【分类号】：TU973.213
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