本文選題：安全閥　切入點：數(shù)值模擬　出處：《華東理工大學(xué)》2013年碩士論文　論文類型：學(xué)位論文

【摘要】：安全閥是承壓系統(tǒng)中重要的安全附件之一。本文結(jié)合核電主蒸汽安全閥全性能試驗的熱態(tài)試驗裝置對安全閥進行瞬態(tài)數(shù)值模擬。其主要研究內(nèi)容包括： (1)本文對安全閥進行了穩(wěn)態(tài)模擬和瞬態(tài)模擬的比較,得到了瞬態(tài)模擬更符合安全閥的實際泄放情況。然后對安全閥內(nèi)流場開啟到關(guān)閉整個過程進行了定性與定量分析。定性分析知道了雙調(diào)節(jié)圈安全閥的臨界流出現(xiàn)在上下調(diào)節(jié)圈,閥座,閥瓣組成的環(huán)形區(qū)域和出口管道至外接容器段,并沒有出現(xiàn)在喉徑處；定量分析發(fā)現(xiàn)由于流體介質(zhì)在安全閥開啟的初始過程中處于高速噴射狀態(tài),導(dǎo)致了閥瓣速度,流體作用力的劇烈震蕩,隨著安全閥的排放,震蕩會越來越小,直到趨于平衡狀態(tài)。 (2)本文研究了安全閥開啟過程動態(tài)特性及其影響因素。包括入口壓力,彈簧剛度,承壓容器大小等因素。知道了安全閥彈簧的剛度和承壓容器的大小對安全閥排放的動態(tài)特性影響比較大。為了安全閥流體介質(zhì)的正常泄放,彈簧的選取一定要合理。彈簧剛度太大會致使安全閥不能迅速起跳,介質(zhì)得不到有效的泄放；太小則會導(dǎo)致安全閥開啟到最大位移時,對反沖盤的沖擊過大,導(dǎo)致閥瓣與反沖盤易于損壞。 (3)本文詳細(xì)的介紹了一種測量安全閥熱態(tài)機械性能的試驗裝置與方法。此試驗裝置具有一般試驗裝置沒有的優(yōu)點,包括防止安全閥測試過程的頻跳、測量精度高、安全性能強、系統(tǒng)運行穩(wěn)定、自動化程度高等。
[Abstract]:The safety valve is one of the important safety accessories in the pressure system. The transient numerical simulation of the safety valve is carried out in this paper combined with the hot state test device of the main steam safety valve in nuclear power plant. The main research contents are as follows:. In this paper, the steady state simulation and transient simulation of safety valve are compared. The transient simulation is more in line with the actual discharge situation of the safety valve. Then the whole process of opening to closing the internal flow field of the safety valve is qualitatively and quantitatively analyzed. The qualitative analysis shows that the critical flow out of the double regulating ring safety valve is now up and down the regulating ring. Seat, disc ring area and outlet pipe to external container section, not at throat diameter; quantitative analysis shows that the fluid medium is in a high velocity jet state during the initial opening of the relief valve, resulting in disc velocity, The violent oscillation of fluid force, as the relief valve discharge, will become smaller and smaller until the state of balance. This paper studies the dynamic characteristics of safety valve opening process and its influencing factors, including inlet pressure, spring stiffness, It is known that the stiffness of the relief valve spring and the size of the pressure vessel have great influence on the dynamic characteristics of the relief valve discharge. The spring must be selected reasonably. The spring stiffness is too general to cause the relief valve to take off quickly, and the medium can not be effectively released; too small will cause the relief valve to open to the maximum displacement, and the impact on the recoil disk will be too great. Causes disc and recoil disc to be easily damaged. This paper introduces in detail a test device and method for measuring the hot mechanical properties of the safety valve. This test device has the advantages of preventing the frequency hopping during the testing process of the safety valve, high measuring accuracy and strong safety performance. The system runs stably and has high degree of automation.
【學(xué)位授予單位】：華東理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2013
【分類號】：TH134

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本文編號：1562060