本文選題：迷宮密封 + 雙控制體模型　； 參考：《復(fù)旦大學(xué)》2011年碩士論文

【摘要】：迷宮密封是旋轉(zhuǎn)機(jī)械中常用的阻止流體泄漏的部件,當(dāng)密封內(nèi)轉(zhuǎn)子因撓曲、偏心或旋轉(zhuǎn)發(fā)生渦動(dòng)運(yùn)動(dòng)時(shí),密封內(nèi)流體對(duì)轉(zhuǎn)子產(chǎn)生合力,即密封力。密封力對(duì)系統(tǒng)穩(wěn)定性有重要影響,但是由于密封結(jié)構(gòu)以及流體在密封腔內(nèi)流動(dòng)狀況的復(fù)雜性,對(duì)于轉(zhuǎn)子-密封系統(tǒng)的氣動(dòng)力研究尚處于初級(jí)階段。 本文利用雙控制體模型給出了迷宮密封內(nèi)可壓縮流場(chǎng)的控制方程,并與轉(zhuǎn)子振動(dòng)方程-并無量綱化。針對(duì)線性方法求解轉(zhuǎn)子-密封系統(tǒng)無法得到其非線性特性的局限性,提出密封內(nèi)可壓縮流動(dòng)與轉(zhuǎn)子系統(tǒng)動(dòng)力學(xué)的耦合求解方法,得到了非線性密封力。進(jìn)而以不平衡轉(zhuǎn)子-密封系統(tǒng)為算例,計(jì)算分析了系統(tǒng)的非線性動(dòng)力特性,得到轉(zhuǎn)子不同轉(zhuǎn)速下的軸心軌跡圖和Poincare截面圖,可以直觀了解系統(tǒng)的非線性動(dòng)力特性。 使用計(jì)算流體動(dòng)力學(xué)軟件Fluent模擬計(jì)算密封腔內(nèi)可壓縮流場(chǎng),采用標(biāo)準(zhǔn)κ-ε模型來求解迷宮密封的湍流流動(dòng),離散方法為有限體積法。網(wǎng)格劃分使用四邊形網(wǎng)格,并對(duì)近壁面網(wǎng)格加密,得到流場(chǎng)速度分布并計(jì)算系統(tǒng)動(dòng)特性參數(shù)。
[Abstract]:Labyrinth seal is one of the commonly used parts to prevent fluid leakage in rotating machinery. When the rotor in the seal is whirled because of deflection eccentricity or rotation the fluid in the seal exerts a force on the rotor namely sealing force. The sealing force has an important effect on the stability of the system, but due to the complexity of the sealing structure and the fluid flow in the sealing chamber, the aerodynamic research of the rotor-seal system is still in the primary stage. In this paper, the governing equation of compressible flow field in labyrinth seal is given by using the dual control volume model, and it is dimensionless with the vibration equation of rotor. In order to solve the problem that the nonlinear characteristics of rotor-seal system can not be obtained by linear method, a coupling method between compressible flow in seal and rotor system dynamics is proposed, and the nonlinear sealing force is obtained. Then taking the unbalanced rotor-seal system as an example, the nonlinear dynamic characteristics of the system are calculated and analyzed. The axis trajectory diagram and the Poincare section diagram of the rotor at different rotational speeds are obtained, and the nonlinear dynamic characteristics of the system can be intuitively understood. The compressible flow field in the seal cavity is simulated by the computational fluid dynamics software Fluent, and the turbulent flow in the labyrinth seal is solved by using the standard 魏-蔚 model. The discrete method is the finite volume method. The quadrilateral mesh is used to divide the meshes and the near wall mesh is encrypted to obtain the velocity distribution of the flow field and to calculate the dynamic parameters of the system.
【學(xué)位授予單位】：復(fù)旦大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2011
【分類號(hào)】：TH136

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本文編號(hào)：1864090