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双语推荐：迷宫密封

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往复式压缩机迷宫密封加工过程中,为简化加工工艺,将传统迷宫密封加工成类迷宫螺旋密封。为比较类迷宫螺旋密封与迷宫密封的密封性能差异,分析类迷宫螺旋密封的密封机制,将类迷宫螺旋密封的能量耗散分成类迷宫密封能量耗散和槽向能量损失,采用CFD方法对类迷宫螺旋密封的密封性能进行数值模拟。结果表明,类迷宫螺旋密封的密封性能虽不及传统迷宫密封,但密封效果相差在5%以内,综合考虑加工工艺、经济效益等因素,采用类迷宫螺旋密封代替迷宫密封是完全可行的。
To simplify the processing technology,the labyrinth-like screw seal is used to replace the traditional labyrinth seal during the machining process of labyrinth reciprocating compressor.The sealing performance between the labyrinth seal and the labyrinth-like screw seal was compared,and the sealing mechanism of labyrinth-like screw seal was analyzed.By dividing the energy dissipation of labyrinth-like screw seal into the energy dissipation of labyrinth-like seal and the energy loss at groove direction,the sealing performance of the labyrinth-like screw seal was simulated by using CFD method.The results show that the sealing performance of the labyrinth-like screw seal is less than that of traditional labyrinth seal,but the sealing effect difference is within 5%.It is completely feasible to use the labyrinth-like screw seal instead of the laby-rinth seal with considering processing technology,economic benefit and other factors.

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以压缩机迷宫密封为研究对象,利用FLUENT模拟气体在迷宫密封中的内部流动,分析了气体在迷宫密封中的速度与压力分布,并研究了间隙宽度和空腔深度对迷宫密封泄漏量的影响,提出了4种不同尺寸的迷宫密封结构,分别得到在不同模型下泄漏量与压差之间的变化规律,其中模型D有效减少了迷宫密封的泄漏量,提高了密封性能。
Based on the labyrinth seal model of compressor using in flare gas recovery,FLUENT is used to imitate internal flow of labyrinth seal,the distributive figures of pressure,velocity are obtained,the relationship between leakage and gap width and cavity depth has been analyzed,four different size of labyrinth seal was chosen,variable curves of pressure difference and leakage is acquired,model D can effectively reduce the leakage of labyrinth seal,which improves the seal performance.

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采用计算流体动力学软件、RNG k-ε模型、Simple算法和结构化网格,研究不同间隙、压比、转速等工况下密封表面凹槽结构对凹槽迷宫密封三维流场和泄漏流动特性的影响。结果表明:凹槽迷宫密封的凹槽结构可以更加充分地耗散气体的动能,从而有效地阻滞气体流动,减小气体的泄漏;迷宫密封的泄漏量随间隙的增大而增大,但凹槽迷宫密封泄漏量和泄漏量增加率都小于普通迷宫密封;随着压比的增大,凹槽迷宫密封的泄漏量有所增加,但相比于普通迷宫密封,其泄漏量增加的趋势在逐渐减小;随着转速的增加,凹槽迷宫密封更容易在凹槽内形成气旋效应,从而使其封严性能显著提高。
The effect of the rub-groove structure of seal surface on three dimensional (3-D)flow field and leakage flow rate of the rub-groove labyrinth seal was researched by using computing hydrokinetics software,RNG k-εmodel,Simple algorithm and structural gridding under different conditions of the clearance,the pressure ratio and the rotational speeds. The results show that the groove seal structure can realize the full gas kinetic energy dissipation,thus it can block the gas flow and reduce the gas leakage effectively.The leakage flow of labyrinth seal is increased with the increase of the clear-ance,but both the amount and the rate of leakage of the rub-groove labyrinth seal are less than the common labyrinth seal. Along with the rise of pressure ratio,the leakage flow of rub-groove labyrinth is increased,but in a reducing gradient com-pared to the common labyrinth seal.Along with the increase of rotational speed,rub-groove labyrinth seal are more likely to form the effect of cyc

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针对目前主要以单侧齿、单一变量变化研究迷宫密封泄漏量所存在的不足，本文以多变量函数理论为基础，以双侧齿迷宫空腔结构多参数变化对迷宫密封性能影响为研究对象，对双齿侧、双变量变化的迷宫密封泄漏量进行研究。通过对迷宫密封流场中三角形齿和矩形齿的深宽比、密封间隙、齿数等参数变化的模拟研究表明，本文所提出的方法与原计算方法相比，计算精度高3％～5％。
At present,to solve the deficiency in the work for the labyrinth seal leakage from the unilateral teeth and single varia-ble.the labyrinth seal leakage of double teeth and double variables was studied based on multivariable theory.Through the research and simulation in the aspect ration,sealing gap,tooth number and other parameters from triangular and rectangular teeth in labyrinth flow field,come to a conclusion:numerical accuracy of the proposed method is higher 3%~5% than the original method.

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迷宫螺旋密封在解决高温、高压、易燃、易爆、腐蚀、含颗粒介质等苛刻条件下的密封问题具有独特优势。介绍了常用矩形、梯形、三角形螺旋槽形状迷宫螺旋密封的结构及原理。结合某型磁力搅拌器的实际工况,选择三角形迷宫螺旋组合密封对其原有水压密封进行改进及试验。试验结果表明:改进后的密封装置具有良好的密封效果,且不受外部供水环境影响,可节省水源,对使用环境适应性好,推广应用范围广阔。
The labyrinth screw seal structure would have its unique advantages to solve the harsh operation conditions,such as sealing problems under high temperature,high pressure,flammable, explosive,corrosion and particle medium.The certain of the labyrinth screw seal is introduced,and its structure with the triangular-shaped thread,the rectangle-shaped thread and the ladder-shaped thread are proposed.The rectangle-shaped labyrinth screw combined seal was selected to improve the water pressure seal of the magnetic agitator considering its actual working condition,the ex-periment verified its better seal performance.

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为解决移动式液压缸直通式迷宫密封泄漏量分析困难的问题,提出一种数值模拟研究方法,基于PHOENICS软件对采用k-ε湍流模型的不可压缩流体的迷宫密封流场进行了计算,分析了缝隙中液压油为层流时迷宫密封的凹槽数目、凹槽深度、凹槽宽度及边界相对运动速度对泄漏量的影响。研究发现:缝隙中液压油在层流状态下,迷宫式密封结构并没有起到防漏效果,反而带来负面影响。与其他方法相比,该数值模拟方法比较经济实用,可供液压密封设计研发人员参考。
In order to solve the leakage analysis problem of straight-through labyrinth seals for hydraulic cylinder,a numerical a-nalysis method was presented,in which k-εturbulent model of incompressible fluid was used to calculate the leakage of the labyrinth seal in piston edge based on PHOENICS software,the influences of groove number,groove depth,groove width and linear velocity on leakage were analyzed. It is shown that under laminar condition,the labyrinth seal not only cannot prevent leaking,but also brings negative influence. Comparing with other methods,the simulation method is more economical and practical,and it supplies valuable reference for hydraulic component designer.

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针对碳纤维牵伸室饱和蒸汽的泄漏问题,利用迷宫原理,提出2种方案对牵伸室入口、出口处密封结构进行改进,采用Fluent软件计算改进前后密封装置的蒸汽泄漏量,得出密封装置的最优结构,并通过实验验证密封装置的可行性。实验结果表明:仅在碳纤维牵伸室入口或出口安装迷宫密封即可满足密封要求,并使牵伸室饱和蒸汽泄漏量减少了20%以上。
To improve the steam leakage in the carbon fiber drafting room,two plans based on maze principle was put forward for the improvement of sealing structure in the entrance and exit of carbon fiber drafting room.The leakage of steam was calculated for the sealing device before and after improvement based on Fluent,and the optimal structure of the sealing device was obtained.The feasibility of the sealing device was verified through the experiments.The experimental results show that the sealing requirement can be met only installing a labyrinth seal in the entrance or exit of carbon fiber drafting room,which can reduce the leakage of saturated steam by 20% in the carbon fiber drafting room.

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给出了适用于透平压缩机迷宫密封泄漏量的修正模型，并用修正模型对变结构参数下的泄漏量进行规律研究。通过采用工程常用迷宫密封泄漏量理论公式，计算了不同压比下透平压缩机典型平滑型和曲折型迷宫密封流量系数，对比了试验结果，修正了流量系数值；在此基础上，进一步研究了不同间隙和齿数下泄漏量的规律，以研究参数变化对泄漏量的影响。研究结果表明：对于平滑型密封结构，修正模型的修正系数可选择在0．8～1．2；对于曲折型密封结构，修正模型的修正系数可选择在0．7-0．8。本文提供了一种较为准确、T程性的透平压缩机迷宫密封泄漏量模型的修正系数。
@@@@The corrected model of labyrinth seals leakage in turbine compressor was provided, and the correction model is used for regular research on the leakage rate under varied structure & parameter. Through the common use of the theoretical formula of leakage rate in labyrinth seals, the labyrinth seal flow rate coefficients of turbine compressor in typical smoothing type and zigzag type were calculated under different pressure ratios. After compared different experiment results, the value of flow coefficient were modified. In order to study the influence of parameter variation on the leakage rate, the paper studied the regular research of the leakage rate under different clearances or tooth numbers further on the basis of above. Research results showed that for the sealing structure in smoothing type, the correction coefficient of the correction model can be chosen between 0.8~1.2; for the sealing structure in zigzag type, the correction coefficient can be chosen between0.7~0.8. A more

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以湘钢2#TRT轴端密封功能失效的问题展开研究。运用目前国际上通行的透平机械内部流场研究的数值模拟办法,建立三维迷宫密封与蜂窝密封结构并划分网格,使用商业CFD计算软件FLUENT对迷宫密封和蜂窝密封的内部流场进行数值模拟,深入分析工作介质在蜂窝密封中的流动本质。通过数值模拟并结合改造工程实践,从理论和实践两方面验证了TRT轴端密封结构改造后的良好效果。
The sealing failure of the No.2 TRT shaft end was investigated. The flow na-ture of operation media in the honeycomb seal was analyzed in depth by using numerical simulation method worldly popular in studying internal flow field of turbine to establish 3D labyrinth seal and honeycomb seal and divide grid. CFD calculation software FLUENT was used to numerically simulate the internal flow field of labyrinth seal and honeycomb seal. The good result of the structural transformation of the TRT shaft end seal is demonstrated theoretically and practically through numerical simulation as well as the practical result of the transformation project.

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采用CFD方法对不同齿型双侧迷宫密封结构的二维和局部三维模型内部流场进行数值模拟,研究齿型对往复式迷宫压缩机密封性能的影响。结果表明:当密封间隙和齿高一定时,齿型变化对双侧迷宫密封泄漏特性的影响较大,其中圆形齿密封效果最好,其次是梯形齿、三角圆弧齿、矩形齿;二维与三维流场数值模拟出的泄漏量变化趋势一致,但三维流场数值模型的计算结果更接近经验公式的计算结果。
Based on CFD method,the flow fields of bilateral labyrinth seals on 2-D and local 3-D models were numerical simulated on different configuration of teeth shape of labyrinth seals,and the influence of the teeth shape of labyrinth seals on the seal characteristics of reciprocating labyrinth compressor was researched.The results shows that,the teeth shape changes have a significant impact on leakage coefficient of bilateral labyrinth seal when the seal clearance and tooth height are constant.The circular teeth shape has the best sealing effect,the following is trapezoid teeth,triangle teeth,and rectan-gle teeth.The changing trend of leakage by 2-D and 3-D fluidity numerical simulation is consistent,but the calculation re-sults of three-dimensional flow field numerical model are more close to the calculation results of empirical formula.

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