可倾瓦径向气体轴承在低温透平机械中的应用

可倾瓦径向动压气体轴承以其良好的稳定性和自对中能力在低湿透乎机械中获得了广泛的应用。对可倾瓦径向气体轴承的工作原理和在低湿透乎机械中的应用发展情况进行了综述。     

分流叶片位置对离心压缩机级内部流动和性能影响的数值研究

运用数值求解叶轮机械内部三维粘性流场的方法,对工程上常用的某带分流叶片的离心压缩机叶轮及后接有叶扩压器的内部流动和性能进行数值研究。通过求解分流叶片处于不同周向位置和其前缘处于不同流向位置时级的流场,得到了对应的内部流场和压力、效率与流量的性能曲线。结合对级性能曲线和内部流场的详细分析,结果表明:分流叶片处于不同的周向位置和其前缘处于不同流向位置时对级的内部流场和性能曲线影响很大,分流叶片中间叶高处前缘位置位于50%左右和周向位置距长叶片吸力面一侧1/10栅距左右,级性能较佳。     

叶顶间隙对轴流式叶轮机械性能及噪声的影响研究进展

在轴流式叶轮机械中转子与机壳之间存在一定的间隙,该间隙的大小对叶轮机械的全压、效率和噪声等均有很大影响。结合近年来在叶顶间隙领域开展的研究,详细综述了国内外在叶顶间隙对轴流式叶轮机械性能及噪声的影响等方面的研究进展,并对叶顶间隙在今后的发展方向进行了展望,为叶轮性能的优化提供参考。     

An Analysis of Flow in a Centrifugal Impeller by FEM with k-ε Model

IntnMluctiouIn the passage of a centrifugal impeller, there is notonly a secondary flow toward a suchon-side from aPressure-side along a casing or a hub s~e but also aleakage flow through a clearance between a casings~e and a blade hp. The~, it is imPOI'tant tO clarifysuch a passage flow with regard to the design of acentrifugal turbomashinery with high efficiency.The impeller passage nows have been inveshgatedfrom the flow measurementS with a pressure Probe, ahot-wire anemometer and a LDV…     

Multigrid Navier—Stokes Calculation for Two Dimensional Cascades

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

Numerical investigation of loss generation mechanisms of flow in turbomachinery by using curved square duct

The secondary flow within a passage of turbomachinery exhibits a complex flow pattern by the effect of the centrifugal and the Coriolis forces. The passage vortex in this secondary flow generates a major part of the losses. However, the mechanism of the loss generation has not been fully clarified yet. In this point of view, the passage vortex is closely examined by the computational method using the two-dimensional curved square ducts as fundamental models. The inlet boundary layer thickness and the inlet velocity distortion are considered to be the major parameters affecting the generation of passage vortex in the present study. The computed results revealed that the passage vortex gave the predominant effects for the generation of loss not only in the breakdown process but also in the development process.     

最近十年叶轮机械最优设计的一些进展

本文介绍了最近十年中径、轴流式燃气透平和蒸汽透平、压气机、通风机、叶轮泵和水轮机等叶轮机械热(水)力性能和结构最优设计方面的一些进展,并给出了丰富的文献目录。     

扰流柱形状对透平机械尾部冷却效果的影响

对滴形扰流柱对透平机械尾部换热及阻力的影响进行了实验研究，设计了柱体形状及排列方式的影响。实验结果表明，滴形扰流柱和常用的圆柱相比，具有强化传热及节能的双重优点。     

叶轮机械内部流场数值模拟研究综述

介绍了叶轮机械内部流场数值模拟的发展历史,并分别介绍了无粘性流、准粘性流、完全粘性流三个模拟阶段中各种数值模拟方法的原理、特点及应用。对今后叶轮机械内流数值模拟在湍流模式、优化设计、计算网络产生和并行处理等方面的发展作了展望。