本文選題：漏損探測球 + 繞流�。� 參考：《浙江大學(xué)》2015年碩士論文

【摘要】：管道漏損檢測是保障管道系統(tǒng)安全的重要手段。針對檢測長距離海底管道輸水漏損等新情況,提出了智能探測球技術(shù)進(jìn)行漏損檢測。本文對探測球在管道中的運(yùn)動進(jìn)行了模型實(shí)驗(yàn)和數(shù)值模擬研究,研究內(nèi)容著重于探測球設(shè)計(jì)參數(shù)及管道系統(tǒng)工況對其運(yùn)動的影響,為實(shí)際工程應(yīng)用提供理論基礎(chǔ)。 本文首先對有壓管中探測球滾動前進(jìn)的動力學(xué)特性進(jìn)行了理論分析,研究了球體運(yùn)動速度與各影響因素之間的函數(shù)關(guān)系,為模型實(shí)驗(yàn)和數(shù)值模擬提供理論基礎(chǔ)。在此基礎(chǔ)上,設(shè)計(jì)了探測球在管中滾動行進(jìn)的模型實(shí)驗(yàn),探討了球體在有壓管道中滾動前進(jìn)速度受管道內(nèi)來流速度、球體與管道直徑比、球體比重、管道傾斜坡度的影響,測得24顆不同比重、不同直徑的塑料球體在不同傾斜程度管道中運(yùn)動的速度,并得到了球體爬坡所需的最小來流速度。實(shí)驗(yàn)結(jié)果表明球體速度與來流速度及直徑比成正比,與比重及坡度成反比。最后應(yīng)用三維計(jì)算流體力學(xué)(CFD)理論建立了球體運(yùn)動的RNG κ-εs數(shù)值模型,并對探測球的運(yùn)動特性進(jìn)行了三維數(shù)值模擬,得到探測球周圍流體的速度和壓力分布規(guī)律,分析了來流流速的改變對球體繞流流態(tài)和阻力系數(shù)的影響,給出了與直徑比和雷諾數(shù)有關(guān)的阻力系數(shù)方程。本文的主要創(chuàng)新點(diǎn)是通過實(shí)驗(yàn)和數(shù)值模擬研究了探測球在流體推動下管內(nèi)滾動前進(jìn)時(shí)的動力學(xué)特性,為優(yōu)化探測球的設(shè)計(jì)參數(shù)及探測球定位提供技術(shù)支持。
[Abstract]:Pipeline leakage detection is an important means to ensure the safety of pipeline system. In view of the new situation of detecting water leakage in long distance submarine pipeline, an intelligent ball detection technique is put forward for leak detection. In this paper, the model experiment and numerical simulation of the motion of the detecting sphere in the pipeline are carried out. The research focuses on the influence of the design parameters of the detecting sphere and the operating conditions of the pipeline system on its motion. In this paper, the dynamic characteristics of detecting the ball rolling forward in a pressurized tube are analyzed theoretically, and the functional relationship between the velocity of the ball and the influencing factors is studied. It provides theoretical basis for model experiment and numerical simulation. On the basis of this, the model experiment of detecting the ball rolling through the pipe is designed, and the influence of the rolling forward velocity of the ball in the pressure pipeline on the flow velocity in the pipeline, the ratio of the diameter of the sphere to the pipe, the specific gravity of the sphere, and the slope of the pipe are discussed. The velocities of 24 plastic spheres with different specific gravity and different diameters in the pipe with different inclination degree were measured, and the minimum flow velocity needed for the ball climbing was obtained. The experimental results show that the velocity of the sphere is directly proportional to the velocity and diameter ratio of the incoming flow, and inversely proportional to the specific gravity and slope. Finally, the RNG 魏-蔚 s numerical model of sphere motion is established by using the theory of three-dimensional computational fluid dynamics (CFDs). The velocity and pressure distribution of the fluid around the sphere is obtained by three-dimensional numerical simulation of the motion characteristics of the detecting sphere. The influence of flow velocity on the flow state and drag coefficient around a sphere is analyzed, and the equation of drag coefficient is given, which is related to the diameter ratio and Reynolds number. The main innovation of this paper is to study the dynamic characteristics of the probe ball when it is rolling forward in the tube driven by fluid through experiments and numerical simulation, which provides technical support for optimizing the design parameters of the probe ball and the location of the probe ball.
【學(xué)位授予單位】：浙江大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：U178;P756.2

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本文編號：1984217