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中压低温透平膨胀机轴封封严特性研究
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Numeral Simulation of Sealing Performances of Shaft Seal for Mediumpressure Cryogenic Turboexpander
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    摘要:

    采用现代计算流体力学方法对PT1230中压低温透平膨胀机轴封内的三维定常黏性流场进行数值模拟,研究4种齿形(矩形齿、勾形齿及齿距不同的2种三角形齿)、3种进排气稳压结构共计12种密封方案的封严特性和流场细节。研究结果表明:密封齿的齿形对泄漏量的影响很大,其中齿距较大的三角形齿由于其具有较大的密封腔室,节流膨胀充分,密封性能最强,但是增加了密封的轴向长度;齿封的密封效果主要依赖于齿尖和外端壁的节流间隙,缩短该间隙,齿尖区域的压力梯度增大,密封效果增强;研究的4种齿形中,采用单进单出式的进排气方式时泄漏量最小,采用单进双出且排气口接近进气口的进排气方式时泄漏量最大。研究结果为合理地设计轴封开口位置、选择适宜的轴封长度,为改善密封效果提供了参考。

    Abstract:

    The threedimensional steady flow in shaft seal of PT1230 mediumpressure cryogenic turboexpander was simulated by computational dynamics fluid method,and the sealing performances of 12 sealing solution,which were made up of four tooth profiles (rectangular tooth,hook tooth,two triangle teeth with different pitch) and three intakeexhaust system were studded.The results show that tooth shape has great influence on the leakage,among them triangle tooth with larger pitch has the strongest sealing property due to its big seal chamber and full throttling expansion,but the axial length of the sealing is increased.The sealing effectiveness of tooth sealing is mainly dependent on pitch between the tip and endwall,so that shortening this pitch can increase pressure gradient and enhance sealing effect.For the shaft seals with four different tooth profiles,the shaft seal with the intake and exhaust mode of single inlet and double seal gas outlet has the maximum leakage,and the shaft seal with the mode of single seal gas inout has the smallest leakage.The computational results can provide the necessary reference for rational design of seal open position,appropriate selection of tooth length and improvement of sealing effect.

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张志莲,肖云峰,吕涛,黄俊强.中压低温透平膨胀机轴封封严特性研究[J].润滑与密封,2016,41(5):76-81.
ZHANG Zhilian, XIAO Yunfeng, LV Tao, HUANG Junqiang. Numeral Simulation of Sealing Performances of Shaft Seal for Mediumpressure Cryogenic Turboexpander[J]. Lubrication Engineering,2016,41(5):76-81.

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  • 在线发布日期: 2016-06-16
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