本文選題：仿楓葉槽　切入點：干氣密封　出處：《昆明理工大學》2017年碩士論文

【摘要】：螺旋槽干氣密封(S-DGS)因具有良好的動壓效應、較強的抗干擾能力,應用較為廣泛。但在實際生產(chǎn)中,由于操作失誤或異常停機事故會導致設備反向旋轉(zhuǎn),從而密封失效的生產(chǎn)事故發(fā)生。雙向旋轉(zhuǎn)密封則可較好的解決該問題。目前,國內(nèi)外研究人員對于雙向旋轉(zhuǎn)式干氣密封密封特性進行了相關的研究,雖然取得了一些進展,但仍存在低速運轉(zhuǎn)開啟力不足等問題。為了獲得更好的雙向旋轉(zhuǎn)槽型密封特性,本文作者基于干氣密封技術和仿生學原理提出一種新型的雙向旋轉(zhuǎn)式干氣密封槽型,并對其密封性能進行研究。主要的研究如下:利用Fluent對仿楓葉槽干氣密封流場進行數(shù)值模擬,分別考察了不同氣膜厚度和不同操作條件對密封性能的影響,結果表明:膜厚ho分別為2.03μm、3.05μm、5.08μm時,仿楓葉槽干氣密封均能具有穩(wěn)定的動壓效應,在同一槽深下,動壓效應會隨氣膜厚度的增加而減弱;膜厚ho=2.03μm時,開啟力和泄漏率均隨操作壓力的增大而增加,且開啟力的增幅更大。當槽深大于11μm后,與螺旋槽干氣密封相比,仿楓葉槽具有更大的開啟力;當槽深為5μm時,氣膜厚度在3～5μm時,仿楓葉槽相比于螺旋槽具有更好的抗干擾能力。利用Fluent數(shù)值模擬分析了實際氣體效應對螺旋槽、槽底傾斜螺旋槽、仿楓葉槽干氣密封性能的影響。研究結果表明,槽底傾斜相比于普通螺旋槽具有更大的軸向剛度。實際氣體效應對于干氣密封的泄漏率有較大影響,對于氣膜開啟力的影響不大�？諝夂偷獨庠诶硐霘怏w狀態(tài)的結果和實際氣體的結果相差不大,由于氫氣相比空氣、氮氣更難壓縮,氫氣實際氣體的結果均小于理想氣體的結果。實際氣體效應對槽區(qū)溫度沒有太大影響。仿楓葉槽靠近外徑處的氣體溫度較低,當膜厚的增加,氣膜的高溫區(qū)由臺區(qū)逐漸轉(zhuǎn)移到密封壩區(qū)。膜厚越大,端面氣膜的平均溫度越低。假設靜環(huán)變形是軸對稱線性變形,將氣膜壓力與靜環(huán)變形進行耦合分析,采用皮采諾圓環(huán)理論計算公式,對靜環(huán)的變形量解析計算,結果表明,密封間隙越小,靜環(huán)變形量越大。利用ANSYS Workbench平臺聯(lián)合Fluent和Mechanical軟件對仿楓葉槽干氣密封進行流固耦合數(shù)值模擬,并將數(shù)值模擬的結果與解析計算的結果進行對比驗證,結果表明,數(shù)值模擬的結果與解析計算的結果相差不是特別大,靜環(huán)最大變形量主要發(fā)生在靜環(huán)外徑處。
[Abstract]:The spiral groove dry gas seal S-DGSs is widely used because of its good dynamic pressure effect and strong anti-interference ability. However, in actual production, the equipment will rotate in reverse because of operation error or abnormal shutdown accident. Thus, the production accident of seal failure occurs. Bidirectional rotary seal can solve this problem better. At present, researchers at home and abroad have carried out relevant research on the characteristics of bidirectional rotary dry gas seal, although some progress has been made. However, there are still some problems such as insufficient opening force in low speed operation. In order to obtain better sealing characteristics of bidirectional rotary groove, a new type of bidirectional rotary dry gas seal groove is proposed based on dry gas seal technology and bionic principle. The main results are as follows: numerical simulation of dry gas seal flow field in maple blade grooves was carried out by Fluent, and the effects of different film thickness and operation conditions on seal performance were investigated respectively. The results show that when the film thickness ho is 2.03 渭 m ~ 3.05 渭 m ~ 5.08 渭 m, the dynamic pressure effect of dry gas seal in maple blade trough is stable, and the dynamic pressure effect decreases with the increase of film thickness under the same groove depth, and when the film thickness is ho=2.03 渭 m, the dynamic pressure effect decreases with the increase of film thickness. Both the opening force and leakage rate increased with the increase of operating pressure, and the opening force increased more. When the groove depth was more than 11 渭 m, the simulated maple blade groove had a greater opening force than the spiral groove dry gas seal, and when the groove depth was 5 渭 m, the film thickness was 3 渭 m. Compared with the spiral groove, the simulated maple blade groove has better anti-interference ability. The effect of the actual gas effect on the helical groove, the inclined spiral groove at the bottom of the groove and the dry gas seal performance of the simulated maple blade groove is analyzed by Fluent numerical simulation. The results show that, The inclination of the bottom of the groove has greater axial stiffness than that of the common spiral groove. The actual gas effect has a great effect on the leakage rate of the dry gas seal. The result of air and nitrogen in ideal gas state is not different from that of real gas, because hydrogen is more difficult to compress nitrogen than air. The results of the actual hydrogen gas are smaller than those of the ideal gas. The actual gas effect has no great effect on the temperature of the trough. The temperature of the gas near the outer diameter of the maple leaf trough is lower than that of the ideal gas, and when the film thickness increases, The higher the film thickness, the lower the average temperature of the gas film. Assuming that the static ring deformation is axisymmetric linear deformation, the film pressure is coupled with the static ring deformation. The deformation of the static ring is calculated analytically by using the theoretical formula of Piczeno ring. The result shows that the smaller the seal clearance, the smaller the seal clearance. The larger the deformation of static ring is, the more numerical simulation of fluid-solid coupling is carried out by using ANSYS Workbench platform combined with Fluent and Mechanical software, and the results of numerical simulation are compared with those of analytical calculation. The result of numerical simulation is not especially different from that of analytical calculation. The maximum deformation of static ring mainly occurs at the outside diameter of static ring.
【學位授予單位】：昆明理工大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TH136

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