發(fā)布時(shí)間：2018-05-25 04:28

  本文選題：柱面螺旋槽干氣密封 + PH線性化��； 參考：《蘭州理工大學(xué)》2017年碩士論文

【摘要】：在形式多樣的非接觸式密封中,干氣密封作為一種新型的、先進(jìn)的軸端密封,因其優(yōu)良的密封性能、較長(zhǎng)的使用壽命和運(yùn)行過(guò)程中的低磨損量,在旋轉(zhuǎn)流體機(jī)械中得到了廣泛的應(yīng)用。近年來(lái),隨著流體機(jī)械不斷向高溫、高速、高壓的方向發(fā)展,對(duì)于旋轉(zhuǎn)機(jī)械的軸端密封也就提出了更高的要求。本文針對(duì)煙氣輪機(jī)和燃?xì)廨啓C(jī)高溫大振幅的工況特性,提出了一種能適應(yīng)這種工況的柱面螺旋槽干氣密封。主要研究了柱面氣膜的壓力分布以及柱面密封的穩(wěn)態(tài)特性。本文根據(jù)柱面螺旋槽密封的特點(diǎn),建立了考慮滑移邊界條件下的穩(wěn)態(tài)柱面雷諾方程。在相關(guān)文獻(xiàn)的基礎(chǔ)上,建立了含有螺旋槽結(jié)構(gòu)參數(shù)的氣膜厚度函數(shù)關(guān)系式。在膜厚方程和壓力邊界條件的控制下,利用PH線性化和小參數(shù)迭代等數(shù)學(xué)方法,求解出了柱面螺旋槽氣膜壓力分布的函數(shù)近似解析解。通過(guò)MATLAB軟件進(jìn)行編程,獲得了在特定工況下柱面氣膜的三維壓力分布情況,并對(duì)指定工況下的柱面螺旋槽密封穩(wěn)態(tài)特性進(jìn)行了求解,獲得了柱面螺旋槽密封的氣膜浮升力、密封泄漏量和摩擦轉(zhuǎn)矩等參數(shù)的大小。同時(shí),計(jì)算了偏心率存在情況下,無(wú)螺旋槽柱面密封和無(wú)偏心率存在情況下,螺旋槽柱面密封的壓力分布和穩(wěn)態(tài)特性,并與柱面螺旋槽干氣密封計(jì)算結(jié)果進(jìn)行對(duì)比分析。在上述基礎(chǔ)上,針對(duì)不同的螺旋槽參數(shù)和工況參數(shù),分析了氣膜壓力分布與螺旋槽槽數(shù)、槽深、偏心率和密封寬度之間的變化規(guī)律。同時(shí),也討論了不同結(jié)構(gòu)工況參數(shù)下,氣膜浮升力、密封泄漏量和摩擦轉(zhuǎn)矩的變化規(guī)律。通過(guò)綜合以上研究分析結(jié)果,提出了部分優(yōu)化的螺旋槽結(jié)構(gòu)參數(shù)。結(jié)果表明:槽數(shù)、槽深、偏心率的增大,都會(huì)導(dǎo)致壓力峰值逐漸增大;而密封寬度對(duì)壓力峰值影響不大。在不同偏心率下,槽數(shù)的變化對(duì)氣膜浮升力的影響不明顯,但是會(huì)導(dǎo)致摩擦轉(zhuǎn)矩的升高,泄漏量會(huì)下降至穩(wěn)定值。隨著槽深的增加,氣膜浮升力下降,泄漏量和摩擦轉(zhuǎn)矩都增加。隨著密封寬度的增加,氣膜浮升力變大,泄漏量減小。螺旋角的增加使得氣膜浮升力下降,摩擦轉(zhuǎn)矩和泄漏量上升。推薦了優(yōu)化槽數(shù)為12~18,密封寬度為0.03~0.045m,螺旋角為40°~50°。對(duì)后續(xù)的理論研究和工程應(yīng)用提供了一定的依據(jù)和參考。
[Abstract]:In various forms of non-contact seal, dry gas seal as a new type of advanced shaft end seal, because of its excellent sealing performance, long service life and low wear during operation, It is widely used in rotating fluid machinery. In recent years, with the development of fluid machinery towards high temperature, high speed and high pressure, higher requirements for shaft end sealing of rotating machinery have been put forward. In this paper, according to the characteristics of high temperature and large amplitude of flue gas turbine and gas turbine, a cylinder spiral groove dry gas seal is proposed. The pressure distribution of cylinder film and the steady state characteristics of cylinder seal are studied. In this paper, according to the characteristics of cylindrical spiral groove seal, the steady cylinder Reynolds equation considering slip boundary condition is established. On the basis of related literatures, the functional expression of film thickness with structural parameters of spiral groove is established. Under the control of film thickness equation and pressure boundary condition, the approximate analytical solution of film pressure distribution in cylindrical spiral groove is obtained by using PH linearization and small parameter iteration. The three-dimensional pressure distribution of cylinder film is obtained by programming with MATLAB software, and the steady state characteristics of cylinder spiral groove seal under specified working condition are solved, and the floating force of cylinder spiral groove seal is obtained. Sealing leakage and friction torque and other parameters of the size. At the same time, the pressure distribution and steady state characteristics of spiral groove cylinder seal under the condition of eccentricity, unhelical groove cylinder seal and unbiased heart rate are calculated and compared with the calculated results of cylinder spiral groove dry gas seal. On the basis of the above, according to different helical groove parameters and operating conditions, the variation of film pressure distribution and the number of spiral grooves, groove depth, eccentricity and seal width are analyzed. At the same time, the variation law of film floating lift, seal leakage and friction torque are also discussed. Based on the above analysis results, some optimized structural parameters of spiral grooves are proposed. The results show that the increase of slot number, groove depth and eccentricity will result in a gradual increase of the pressure peak value, while the seal width has little effect on the pressure peak value. Under different eccentricity, the influence of the number of slots on the lift of the film is not obvious, but the friction torque will increase and the leakage will decrease to the stable value. With the increase of groove depth, the lift of film float decreases, the leakage and friction torque increase. With the increase of seal width, the lift of film float increases and the leakage decreases. The increase of spiral angle decreases the lift of the film and increases the friction torque and leakage. It is recommended that the optimized slot number be 12 ~ 18, the seal width 0.03 ~ 0. 045 m and the helical angle 40 擄~ 50 擄. It provides a certain basis and reference for the subsequent theoretical research and engineering application.
【學(xué)位授予單位】：蘭州理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類(lèi)號(hào)】：TH136

【參考文獻(xiàn)】

相關(guān)期刊論文 前10條

1 黃付強(qiáng);曹會(huì)敏;張勇;;干氣密封典型事故案例分析及操作注意事項(xiàng)[J];煤炭與化工;2016年07期

2 陳洪敏;;汽輪機(jī)汽封的節(jié)能改造[J];南通紡織職業(yè)技術(shù)學(xué)院學(xué)報(bào);2014年04期

3 鄭數(shù);郁春鵬;戴榮川;晉圣根;;汽輪機(jī)密封技術(shù)的應(yīng)用與發(fā)展[J];價(jià)值工程;2014年34期

4 馬綱;何軍;孫曉軍;沈心敏;;非線性數(shù)值模擬柱面氣膜密封動(dòng)態(tài)特性[J];航空動(dòng)力學(xué)報(bào);2014年01期

5 丁雪興;張海舟;張偉政;蘇虹;趙芳;;螺旋槽干氣密封氣膜振動(dòng)測(cè)試與穩(wěn)定性分析[J];振動(dòng).測(cè)試與診斷;2013年02期

6 馬綱;何軍;栗秀花;沈心敏;;柱面氣膜密封動(dòng)力特性系數(shù)的數(shù)值計(jì)算[J];機(jī)械工程學(xué)報(bào);2013年05期

7 俞樹(shù)榮;曹興巖;丁雪興;張偉政;韓明君;;螺旋槽干氣密封性能參數(shù)的測(cè)試技術(shù)及試驗(yàn)研究[J];機(jī)械工程學(xué)報(bào);2012年19期

8 馬綱;栗秀花;沈心敏;胡廣陽(yáng);;柱面氣膜密封界面結(jié)構(gòu)與性能分析[J];航空動(dòng)力學(xué)報(bào);2011年11期

9 劉靜宇;麥郁穗;;蜂窩密封技術(shù)在煙氣輪機(jī)上的應(yīng)用[J];石油化工設(shè)備技術(shù);2011年01期

10 洪杰;王虹;馬艷紅;;氣膜密封阻尼結(jié)構(gòu)的氣膜穩(wěn)態(tài)特性分析[J];北京航空航天大學(xué)學(xué)報(bào);2011年01期

相關(guān)碩士學(xué)位論文 前3條

1 張明;旋轉(zhuǎn)機(jī)械高性能密封技術(shù)研究與應(yīng)用[D];北京化工大學(xué);2011年

2 王為偉;刷式密封特性研究及影響因素分析[D];北京化工大學(xué);2011年

3 戴偉;刷式密封泄漏流動(dòng)及接觸傳熱的數(shù)值分析[D];上海交通大學(xué);2011年

，

本文編號(hào)：1932098