【作者】 武亚勇；

【导师】 冯青；

【作者基本信息】 西北工业大学 ， 热能工程， 2007， 硕士

【摘要】 本文对带有微型涡轮(即反预旋喷嘴)的大尺寸高压涡轮旋转盘腔系统内部流场特性进行了实验与三维数值模拟计算对比研究，为未来优化设计涡轮盘腔系统内部流场和换热特性奠定了基础。其中实验研究是在前人实验研究的基础上进行了更进一步的实验研究，三维数值模拟研究是以以往二维数值模拟计算模型为基础。 实验中采用传统流场测量工具五孔探针进行实验数据的采集，具体研究了200rpm、400rpm、600rpm、1100rpm、1400rpm、1800rpm、1900rpm、2000rpm八个转速下大、中、小流量时旋转盘腔内部6个不同轴向位置的速度场分布、压力场分布情况，并对实验数据进行了初步分析。通过实验研究得出以下结论：1．实验得到了旋转盘腔内部切向速度、轴向速度和径向速度以及压力在不同工况下的分布特征和规律；2．实验结果进一步验证了旋转盘腔内部流场控制理论，即，低转速下进气效应控制盘腔内部流场，中高转速和较高转速下旋转效应控制盘腔内部流场；3．根据轴向速度和径向速度的不同，低转速可细分为三种不同的类型，高转速分为中高转速类型和较高转速类型。 三维数值模拟计算研究中由于计算整个盘腔需要的网格过多，所以选取整个盘腔的1/74为计算模型，在几何形状完全相同的周向旋转面施加周期性边界条件，并选用κ-ε湍流模型进行数值模拟，求解了50rpm、600rpm、1800rpm三个转速下大流量时旋转盘腔内部的速度场分布、压力场分布，并将计算结果与实验数据进行了比较分析。数值模拟计算的结果与实验数据对比后表明，两者在总体分布趋势上基本一致，但在具体的数值上有差别：1．两者切向速度分布符合的最好；2．轴向速度和径向速度分布趋势符合好，但是数值模拟得到的具体数值比实验测量得到的数值要小；3．压力分布符合较好。更多还原

【Abstract】 This paper describes a combined experimental and the three-dimension numerical computations study of the large scale rotating cavity system with a subminiature turbine (de-swirl nozzles), which is carried as the basis for optimizing the internal flow and heat transfer in the future turbine machine design. The experimental investigations are based on former experiment study; three-dimensional computation is based on two-dimensional computational model.The traditional equipment, which is used to measure the velocity of the flow field, five-hole probe system was applied in the experiment study. The distributions of velocity field and pressure field inside the rotating cavity were summarized respectively under eight rotational speeds (200rpm, 400rpm, 600rpm, 1100rpm, 1400rpm, 1800rpm, 1900rpm and 2000rpm), three inlet mass flow rates and six axial locations. The experimental studies are as follows: 1.the characteristics of the distributions of velocity field and pressure field are given in the paper; 2.The controlling-theory of flow field was also proved, namely, the flow field is mainly controlled by the inflow effect at lower rotating speeds and by rotating effect at higher speeds; 3. according to the differences of axial velocity and radial velocity, the lower rotational speed type was classified four catalogues, and the higher was classified two.Because of too many computational grid nodes, 1/74 part of experiment rig was chosen in three-dimensional computations. The periodic boundary condition which was set at the same geometrical rotational axial faces and the k-ε turbulence model was applied in three-dimension computational model. The numerical computational distributions of velocity field and pressure field were got under three different rotational speeds (50rpm, 600rpm, and 1800rpm). The comparison of numerical computation results and experiment data indicates that the distribution agrees well but the values of numerical results are lower than experiment results. The conclusions are as following: 1. tangential velocity distributions are nearly same; 2. the axial velocity and radial velocity distributions trend alike, but the specific values doesn’t agree well; 3.the distributions of pressure are reasonably good.更多还原