本文選題：核主泵（NRCP） + 機械密封　； 參考：《西華大學》2014年碩士論文

【摘要】：核主泵流體靜壓型機械密封具有收斂的密封間隙，在實際工況中，動、靜環(huán)端面之間形成一層微米級的介質膜，此為密封副的泄漏源，對其進行控制，能很好的控制其泄漏量。另一方面，介質膜對密封副起潤滑和冷卻的作用，有利于密封環(huán)長時間工作而不被磨損，且具有良好的穩(wěn)定性。 運用流體力學相關理論，建立了核主泵機械密封間隙流場的計算模型，并在考慮介質壓力差及離心力作用的情況下，建立了機械密封端面間的泄漏量計算公式，分析了密封端面結構參數(shù)和操作參數(shù)對密封性能的影響。研究結果表明，密封端面錐角和轉折半徑均對密封泄漏量有顯著影響，離心力對泄漏起阻礙作用。 基于流體力學基本理論和傳熱學，分析核主泵流體靜壓型機械密封的連續(xù)性方程、動量方程、能量方程及粘溫方程，，以及它們相應的邊界條件；基于哈密頓原理及熱流勢最小作用原理，在雙向流-固耦合的基礎上，建立核主泵流體靜壓型機械密封流-固-熱耦合場的數(shù)值分析模型。 基于以往的流-固雙向耦合方法，在結構分析中進行Command處理，改變單元的結構及輸入輸出項，使其能同時接收流場分析中的壓力及溫度載荷；把結構分析中的位移及熱流量傳遞到流場分析中，在ANSYS Workbench上實現(xiàn)多物理場耦合分析。以核主泵機械密封組件為研究對象，對其進行流-固-熱耦合分析，研究了密封間隙的壓力分布和密封環(huán)的應力分布、溫度分布及位移變形。本文使用的流-固-熱耦合模型綜合考慮了密封組件之間的預緊力及熱傳導作用等，能夠真實反映流體和密封結構之間的相互影響。
[Abstract]:The hydrostatic mechanical seal of nuclear main pump has convergent seal clearance. In the actual working condition, a layer of micrometer dielectric film is formed between the moving and static ring end surfaces, which is the leakage source of sealing pair. The leakage amount can be controlled well by controlling it. On the other hand, the medium film can lubricate and cool the seal pair, which is beneficial to the sealing ring working for a long time without being worn out, and has good stability. Based on the relevant theory of fluid mechanics, the calculation model of the clearance flow field of the mechanical seal of the nuclear main pump is established, and the formula for calculating the leakage between the end surfaces of the mechanical seal is established considering the pressure difference of the medium and the centrifugal force. The effects of structural parameters and operating parameters on seal performance are analyzed. The results show that the cone angle and turning radius of the seal face have a significant effect on the leakage rate of the seal, and the centrifugal force hinders the leakage. Based on the basic theory of fluid mechanics and heat transfer, the continuity equation, momentum equation, energy equation and visco-temperature equation of hydrostatic mechanical seal of nuclear main pump are analyzed, and their corresponding boundary conditions are analyzed. Based on the Hamiltonian principle and the principle of minimum heat flux potential, the numerical analysis model of hydrostatic mechanical seal fluid-solid-heat coupling field of nuclear main pump is established on the basis of two-way fluid-solid coupling. Based on the previous fluid-solid bidirectional coupling method, Command is used in the structural analysis to change the structure of the unit and the input and output terms, so that it can simultaneously receive the pressure and temperature load in the flow field analysis. The displacement and heat flux in the structure analysis are transferred to the flow field analysis, and the multi-physical field coupling analysis is realized on ANSYS Workbench. Taking the mechanical seal assembly of the nuclear main pump as the research object, the pressure distribution of the seal clearance and the stress distribution, temperature distribution and displacement deformation of the seal ring are studied by fluid-solid-heat coupling analysis. The fluid-solid-heat coupling model used in this paper takes into account the pretightening force and heat conduction between the sealing components, which can truly reflect the interaction between the fluid and the sealing structure.
【學位授予單位】：西華大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TH136

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