垂直微结构湍流剖面仪结构优化
发布时间：2019-06-27 18:11
【摘要】：海洋微结构湍流的测量对于研究海洋宏观运动和认识海洋内部变化规律具有重要意义，研究海洋微结构湍流的关键是取得湍动能耗散率，搭载剪切流传感器的垂直微结构剖面仪是目前获取海洋微结构湍流数据的最常用平台。垂直剖面仪的测量精度受多种因素影响，主要有流致振动、下降速度、传感器的校核误差、测量水域的非各向同性等。剖面仪测量的精度制约着剖面仪的发展，更高的测量精度是以后垂直剖面仪设计所追求的首要目标。 本文主要就与垂直剖面仪结构相关的影响因素进行研究，即剖面仪的流致振动以及下降速度。使用计算流体力学软件以及流固耦合方法对剖面仪的流致振动机理进行研究，得出影响剖面仪流致振动的结构因素，以剖面仪测量精度为目标对剖面仪结构进行优化。研究取得的主要成果如下： （1）从垂直剖面仪测量原理出发，分析了影响剖面仪测量精度的主要因素，为下一步进行结构优化奠定基础。 （2）分别采用流固耦合分析方法和大涡数值模拟方法，，模拟仿真了垂直微结构剖面仪的下降过程及其周围的流场变化情况，分析了剖面仪下降过程中的运动状态以及下降过程中的涡脱落情况，探讨了剖面仪的流致振动机理。 （3）采用流固耦合方法计算了剖面仪的结构对其流致振动的影响，得到结构尺寸与流致振动的关系，在此基础上，以降低流致振动为目标对剖面仪的结构进行了优化。 （4）分析了剖面仪对下降速度的要求以及剖面仪下降速度的决定因素，发现毛刷阻力系数是控制下降速度的关键因素。使用流固耦合方法计算了剖面仪毛刷的阻力系数，为剖面仪下降速度的控制提供了理论指导。
[Abstract]:The measurement of ocean microstructure turbulence is of great significance for studying the macro motion of the ocean and understanding the internal variation of the ocean. The key to the study of marine microstructure turbulence is to obtain the turbulent kinetic energy dissipation rate. The vertical microstructure profiler with shear flow sensor is the most commonly used platform to obtain the turbulence data of marine microstructure at present. The measurement accuracy of vertical profiler is affected by many factors, such as flow-induced vibration, falling speed, checking error of sensor, non-isotropism of measuring water area and so on. The accuracy of profiler restricts the development of profiler, and higher measurement accuracy is the primary goal of vertical profiler design in the future. In this paper, the influencing factors related to the structure of vertical profiler are studied, that is, the flow-induced vibration and falling speed of the profiler. The fluid-induced vibration mechanism of the profiler is studied by using computational fluid dynamics software and fluid-solid coupling method, and the structural factors affecting the fluid-induced vibration of the profiler are obtained, and the structure of the profiler is optimized aiming at the measurement accuracy of the profiler. The main results are as follows: (1) based on the measuring principle of vertical profiler, the main factors affecting the measurement accuracy of profiler are analyzed, which lays a foundation for the next step of structural optimization. (2) the falling process of vertical microstructure profiler and the variation of flow field around it are simulated by using fluid-solid coupling analysis method and large vortex numerical simulation method, respectively. the motion state of the profiler and the vortex shedding in the falling process are analyzed, and the flow-induced vibration mechanism of the profiler is discussed. (3) the influence of the structure of the profiler on the fluid-induced vibration is calculated by using the fluid-solid coupling method, and the relationship between the structure size and the fluid-induced vibration is obtained. on this basis, the structure of the profiler is optimized in order to reduce the flow-induced vibration. (4) the requirements of the profiler for the falling speed and the decisive factors for the falling speed of the profiler are analyzed. It is found that the brush resistance coefficient is the key factor to control the falling speed. The resistance coefficient of the brush of the profiler is calculated by using the fluid-solid coupling method, which provides theoretical guidance for the control of the falling speed of the profiler.
【学位授予单位】：天津大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TH766
本文编号：2507022
[Abstract]:The measurement of ocean microstructure turbulence is of great significance for studying the macro motion of the ocean and understanding the internal variation of the ocean. The key to the study of marine microstructure turbulence is to obtain the turbulent kinetic energy dissipation rate. The vertical microstructure profiler with shear flow sensor is the most commonly used platform to obtain the turbulence data of marine microstructure at present. The measurement accuracy of vertical profiler is affected by many factors, such as flow-induced vibration, falling speed, checking error of sensor, non-isotropism of measuring water area and so on. The accuracy of profiler restricts the development of profiler, and higher measurement accuracy is the primary goal of vertical profiler design in the future. In this paper, the influencing factors related to the structure of vertical profiler are studied, that is, the flow-induced vibration and falling speed of the profiler. The fluid-induced vibration mechanism of the profiler is studied by using computational fluid dynamics software and fluid-solid coupling method, and the structural factors affecting the fluid-induced vibration of the profiler are obtained, and the structure of the profiler is optimized aiming at the measurement accuracy of the profiler. The main results are as follows: (1) based on the measuring principle of vertical profiler, the main factors affecting the measurement accuracy of profiler are analyzed, which lays a foundation for the next step of structural optimization. (2) the falling process of vertical microstructure profiler and the variation of flow field around it are simulated by using fluid-solid coupling analysis method and large vortex numerical simulation method, respectively. the motion state of the profiler and the vortex shedding in the falling process are analyzed, and the flow-induced vibration mechanism of the profiler is discussed. (3) the influence of the structure of the profiler on the fluid-induced vibration is calculated by using the fluid-solid coupling method, and the relationship between the structure size and the fluid-induced vibration is obtained. on this basis, the structure of the profiler is optimized in order to reduce the flow-induced vibration. (4) the requirements of the profiler for the falling speed and the decisive factors for the falling speed of the profiler are analyzed. It is found that the brush resistance coefficient is the key factor to control the falling speed. The resistance coefficient of the brush of the profiler is calculated by using the fluid-solid coupling method, which provides theoretical guidance for the control of the falling speed of the profiler.
【学位授予单位】：天津大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TH766
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本文编号：2507022
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