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A numerical and experimental study of windback seals.

機(jī)譯：反吹密封件的數(shù)值和實(shí)驗(yàn)研究。

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摘要

Windback seals work similarly to labyrinth seals except for the effect of helical groove. These seals are essentially a tooth on stator or tooth on rotor labyrinth seal where the grooves are a continuous helical cut like a thread. Windback seals are used in centrifugal gas compressor to keep oil out of the gas face seal area. These face seals cannot be contaminated by oil. A purge gas is applied to the seal to help force the oil back into the bearing area.;The windback seal should be designed to prevent any oil contamination into the supply plenum and to reduce purge gas leakage. The CFD simulations have been performed with the effect of clearance, tooth width, cavity shape, shaft rotation, eccentricity, and tooth location on the seal leakage performance and the flow field inside the seal. The leakage flow rate increases with increasing the pressure differential, rotor speed, radial clearance, cavity size, and shaft diameter and with decreasing the tooth width. The eccentricity has a minimal effect for the windback seal. From oil simulations, the windback seal with 25% rotor eccentricity has some of the journal bearing action and drives back flow into the gas plenum. However the windback seal can be used to force the oil back into the bearing side before starting the compressor by applying a purge gas flow since the positive axial velocity inside the cavity is larger than the negative axial velocity. m˙/rhoAcavRw is constant for varying shaft rotation since the leakage flow rate for the windback seal increases linearly as the the rotor speed increases. The leakage flow rate for the windback seal increases as the groove size increases due to the pumping action of the windback seal. A windback seal design based upon the numerical simulations that minimize gas leakage and help prevent gas face seal oil contamination was optimized.;The windback seal has two leakage flow paths. Since the leakage flow rate under teeth of windback seals is the same as for a similar geometry labyrinth seal, the flow under the teeth can be predicted by two-dimensional labyrinth seal analysis. An empirical model for the leakage rate through the cavity has been developed which fits the data with a standard deviation of 0.12.
機(jī)譯：除螺旋形凹槽的影響外，回風(fēng)密封件的工作方式與迷宮式密封件類似。這些密封件實(shí)質(zhì)上是定子上的齒或轉(zhuǎn)子迷宮式密封上的齒，其中凹槽是像螺紋一樣的連續(xù)螺旋形切口?；匦芊饧糜陔x心式氣體壓縮機(jī)，以防止機(jī)油進(jìn)入氣面密封區(qū)域。這些面部密封墊不能被油污染。向密封件施加吹掃氣，以幫助將油壓回軸承區(qū)域。反吹密封件的設(shè)計(jì)應(yīng)防止任何油污進(jìn)入供氣室并減少吹掃氣的泄漏。已經(jīng)執(zhí)行了CFD仿真，其中間隙，齒寬，腔體形狀，軸旋轉(zhuǎn)，偏心率和齒位置對密封件的泄漏性能和密封件內(nèi)部的流場產(chǎn)生了影響。泄漏流量隨著壓差，轉(zhuǎn)子速度，徑向游隙，腔尺寸和軸直徑的增加以及齒寬的減小而增加。偏心對反吹密封的影響最小。從油的模擬中可以看出，轉(zhuǎn)子偏心率為25％的防風(fēng)密封件具有一些軸頸軸承作用，并帶動回流進(jìn)入氣室。但是，由于空腔內(nèi)部的正軸向速度大于負(fù)軸向速度，因此回風(fēng)密封件可通過施加吹掃氣流用于在啟動壓縮機(jī)之前將油壓回到軸承側(cè)。 m＆rhoAcavRw對于變化的軸旋轉(zhuǎn)是恒定的，因?yàn)榛匦芊饧男孤┝髁侩S著轉(zhuǎn)子速度的增加而線性增加。由于凹槽的增加，由于反吹密封件的泵送作用，反吹密封件的泄漏流量增加。優(yōu)化了基于數(shù)值模擬的反吹密封設(shè)計(jì)，可最大程度地減少氣體泄漏并有助于防止氣面密封件被油污染。反吹密封具有兩個(gè)泄漏流路。由于回風(fēng)密封件的齒下泄漏流量與類似的幾何迷宮式密封件相同，因此可以通過二維迷宮式密封分析來預(yù)測齒下的流量。已經(jīng)開發(fā)了通過型腔泄漏率的經(jīng)驗(yàn)?zāi)Ｐ停撃Ｐ蛿M合數(shù)據(jù)的標(biāo)準(zhǔn)偏差為0.12。

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  • 作者

    Lim, Chae Hwan.;

  • 作者單位

    Texas A&M University.;

  • 授予單位 Texas A&M University.;
  • 學(xué)科 Engineering Mechanical.
  • 學(xué)位 Ph.D.
  • 年度 2009
  • 頁碼 255 p.
  • 總頁數(shù) 255
  • 原文格式 PDF
  • 正文語種 eng
  • 中圖分類 機(jī)械、儀表工業(yè);
  • 關(guān)鍵詞

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