【摘要】：海洋微結構湍流的測量對于研究海洋宏觀運動和認識海洋內部變化規(guī)律具有重要意義，研究海洋微結構湍流的關鍵是取得湍動能耗散率，搭載剪切流傳感器的垂直微結構剖面儀是目前獲取海洋微結構湍流數(shù)據的最常用平臺。垂直剖面儀的測量精度受多種因素影響，主要有流致振動、下降速度、傳感器的校核誤差、測量水域的非各向同性等。剖面儀測量的精度制約著剖面儀的發(fā)展，更高的測量精度是以后垂直剖面儀設計所追求的首要目標。 本文主要就與垂直剖面儀結構相關的影響因素進行研究，即剖面儀的流致振動以及下降速度。使用計算流體力學軟件以及流固耦合方法對剖面儀的流致振動機理進行研究，得出影響剖面儀流致振動的結構因素，以剖面儀測量精度為目標對剖面儀結構進行優(yōu)化。研究取得的主要成果如下： （1）從垂直剖面儀測量原理出發(fā)，分析了影響剖面儀測量精度的主要因素，為下一步進行結構優(yōu)化奠定基礎。 （2）分別采用流固耦合分析方法和大渦數(shù)值模擬方法，，模擬仿真了垂直微結構剖面儀的下降過程及其周圍的流場變化情況，分析了剖面儀下降過程中的運動狀態(tài)以及下降過程中的渦脫落情況，探討了剖面儀的流致振動機理。 （3）采用流固耦合方法計算了剖面儀的結構對其流致振動的影響，得到結構尺寸與流致振動的關系，在此基礎上，以降低流致振動為目標對剖面儀的結構進行了優(yōu)化。 （4）分析了剖面儀對下降速度的要求以及剖面儀下降速度的決定因素，發(fā)現(xiàn)毛刷阻力系數(shù)是控制下降速度的關鍵因素。使用流固耦合方法計算了剖面儀毛刷的阻力系數(shù)，為剖面儀下降速度的控制提供了理論指導。
[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.
【學位授予單位】：天津大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TH766

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本文編號：2507022