关于密封间隙气流激振的一个非线性理论模型

本文从流体弹性耦合的角度,研究了密封间隙气流激振的机理,建立了一个描述转子密封系统气流激振的非线性理论模型,分析了密封间隙气流激振的非线性特性及防治措施。     

NUMERICAL ANALYSIS OF LEAKAGE FLOW THROUGH TWO LABYRINTH SEALS

The leakage flow through two labyrinth seals, e.g the interlocking seal and the stepped seal, was numerically investigated. Preliminary calculation of the seal-cavity averaged pressure by using the one-dimensional control volume method showed favorable agreement with the experimental measurements. Subsequently, in-depth understanding of the fluid flow through the labyrinth seals was obtained by employing Computational Fluid Dynamics (CFD) and k ?ε turbulence model, which resulted in a potential wealth of information like the streamline pattern, velocity vector field, and distribution of turbulent kinetic energy and static pressure. At the clearance of the seal the turbulent kinetic energy reached the peak value, while in the bulk region of the cavities it decayed fast. The static pressure rapidly dropped as the fluid flow went through the clearance; no distinct difference of the static pressure was inspected in the cavities. Also noted from the numerical results was that the stepped seal showed better sealing performance than the interlocking seal.     

Taurus 60透平误输出火情信号原因分析与处理

Taurus 60透平机组自运行以来,当透平机控制系统上/下电、卡件故障时,透平机组偶尔会误输出火情信号给平台火气关断系统,导致平台火气关停。通过测试和分析,发现该机组程序采用是的卡件的常闭点,一旦相关卡件掉电或控制系统掉电就会导致火情误输出。本文对此进行了分析并给出了处理措施,可供处理同类机型信号误输出进行参考。     

小透平机在氯气输送方面的应用

介绍了小透平机的工作原理和工艺流程,说明了其运行条件,对比了小透平机的优缺点,指出了试车过程遇到的问题。将小透平机机组应用于南宁化工股份有限公司的新增2万t／a离子膜烧碱生产工序后运行平稳,机组的工艺参数符合设计要求。购买2台机组共需118万元,2年多即可收回投资。     

Multigrid Navier—Stokes Calculation for Two Dimensional Cascades

INTRODUCTIoNOverthepast2OyearssteadyprogresshasbeenmadeinthedevelopmentofCFDcodesforturboma-chinerybladerows.Thenumericalmethodsthathavebeenthemosthighlydevelopedandhaveprovidedthegreatestadvancementsinturbomachineryfielda-rethetimemarchingsolversbasedonafullyconservativeformofgoverningequation.Theyprovideasin-gleapproachforsubsonic,transonic,andsupersonicflows,andtheyinherentlyprovidenaturalshockcaP-turingcapability.lssuesofsolutionaccuracy,geomet-riccomplexity,speed(cost),unsteadiness,…     

不锈钢换热管在氯气冷却中的应用

分析了氯气压缩过程中中间冷却器内漏的原因,提出采用304不锈钢替代20#钢作为换热管对氯气进行冷却的措施.304不锈钢换热管已应用16个月,使用寿命有待进一步考证.     

国际节能国产化,引入GE理念的沈阳透平--访沈阳通用电气透平机械技术有限公司周添生总经理

~~国际节能国产化,引入GE理念的沈阳透平——访沈阳通用电气透平机械技术有限公司周添生总经理!本刊记者@胡志强     

透平叶轮侧沿铣削过切现象及对策

对透平叶轮直纹叶片侧沿铣削时的过切现象及危害进行了讨论，提出了几种减小过切的方法。着重介绍了一种美国专利技术，使用该项技术，根据叶片导曲程度不同，可将过切误差减小５０－９０％。     

直轴旋转叶片型面轮廓度的评定模型

通过对直轴旋转叶片型面成形规律的分析,运用三维几何变换理论,推导出了直轴旋转叶片型面的数学模型。采用等距曲面处理的方法,推导出型面法向等距面的数学表达式,用以消除测头半径的影响。在此基础上,引入分区(段)的概念,建立了按最小二乘法评定型面轮廓度的评定模型。并对型面轮廓度误差进行了定性分析和定量分析,将其分离成形状误差、参数误差和位姿误差,给出了分离的定量公式及误差补偿的原则。