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  本文選題：安全閥 + 排量��； 參考：《華南理工大學》2012年碩士論文

【摘要】：安全閥的安全泄放能力，即排量，是衡量安全閥性能的一個最重要指標。本文在“具有在線功能的安全閥及其檢測系統(tǒng)”專利技術的指導下，對安全閥動態(tài)開啟過程的排量檢測問題及其相關流動機理進行了研究。主要研究內(nèi)容包括： 1、根據(jù)噴管流動特性和理想氣體等熵流動的基本流體控制方程，推導了安全閥開啟排放量的計算公式，系統(tǒng)總結了影響安全閥開啟排放能力的各種因素。提出了安全閥超壓開啟流場參數(shù)之間存在的相互影響機理，尤其是氣體動力學參數(shù)的變化規(guī)律。 2、采用CFD軟件對安全閥開啟過程的三維模型進行動態(tài)數(shù)值仿真，通過仿真分析安全閥流場參數(shù)隨時間變化規(guī)律，得到了閥口附近和出口流產(chǎn)生亞臨界，臨界和超臨界流動的狀態(tài)參數(shù)變化規(guī)律；用流線（streamline）分析法對時間和空間幾何位置上安全閥開啟過程流場參數(shù)的突變機理進行了分析研究，，結果表明在臨界和超臨界狀態(tài)下，流動過程的場參數(shù)的確存在參數(shù)超音速突變，其位置位于幾何截面突變處，且其流動參數(shù)的突變不僅與截面形狀有關，還與自身所處的流動狀態(tài)有關。 3、本文研究了非標準測試條件下安全閥排量與其模擬流量之間的關系，提出了四種安全閥排量的數(shù)值仿真計算方法與數(shù)值仿真排量系數(shù)（Kd,num）定義，分析了各種算法的優(yōu)缺點。研究表明影響安全閥超壓泄放能力及其泄放機理的因素包括開啟高度、進出口壓力比、出口直徑、閥腔背壓等。 4、在實驗研究方面，利用閥芯檢測傳感器和檢測法蘭傳感器在現(xiàn)場試驗中分別進行了排量和其他相關的參數(shù)測試。將二維、三維數(shù)值仿真排量計算值與試驗測試結果比較，研究表明仿真與試驗結果較為一致，從而說明利用專用傳感器來檢測和計量排量具有良好的可操作性。只要數(shù)值仿真計算排量的處理方法得當，就可以較準確地預測安全閥的排放能力。
[Abstract]:The safety discharge capacity of safety valve, I. e., displacement, is one of the most important indexes to measure the performance of safety valve. Under the guidance of patent technology of "On-line safety valve and its detection system", this paper studies the problem of displacement detection and its related flow mechanism in the process of dynamic opening of safety valve. The main research contents include: 1. According to the flow characteristics of nozzle and the basic fluid control equation of ideal gas isentropic flow, the formula for calculating the opening discharge of safety valve is derived, and the various factors affecting the opening discharge capacity of safety valve are summarized systematically. The mechanism of interaction between the parameters of overpressure opening flow field of safety valve, especially the variation of gas dynamics parameters, is put forward. 2. The dynamic numerical simulation of the three dimensional model of the safety valve opening process is carried out by using CFD software. Through the simulation and analysis of the variation law of the safety valve flow field parameters with time, the subcritical flow near the valve opening and the outlet flow is obtained. The variation of state parameters of critical and supercritical flow is studied by streamline line analysis method, and the sudden change mechanism of flow field parameters in the opening process of safety valve in time and space geometry position is analyzed. The results show that in the critical and supercritical states, The field parameters of the flow process do have supersonic mutations, which are located at the abrupt position of the geometric cross section, and the sudden changes of the flow parameters are not only related to the shape of the section, but also to the flow state in which they are located. 3. This paper studies the relationship between relief valve displacement and its simulated flow under non-standard test conditions, proposes four numerical simulation methods of safety valve displacement and the definition of numerical simulation displacement coefficient (Kdnum), and analyzes the advantages and disadvantages of various algorithms. The research shows that the factors influencing the overpressure release ability and its release mechanism include the opening height, the ratio of inlet and outlet pressure, the outlet diameter, the back pressure of the valve cavity, etc. 4. In the aspect of experimental research, the displacement and other related parameters were tested by spool sensor and flange sensor respectively in the field test. By comparing the calculated displacement values of 2D and 3D numerical simulations with the experimental results, it is shown that the simulation results are in good agreement with the experimental results, which shows that it is feasible to use special sensors to detect and measure the displacement. The discharge capacity of the relief valve can be predicted more accurately if the numerical simulation method is proper.
【學位授予單位】：華南理工大學
【學位級別】：碩士
【學位授予年份】：2012
【分類號】：TH134

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