叶栅流动损失的构成、分布以及计算准确性的主要因素是来流边界层状态。
Composition and distribution of the cascade's flow losses, as well as calculation accuracy, depend in the main on boundary layer conditions at entrance.
利用本文的方法，分别计算了跨声速叶栅流动和工程中一类复杂非定常轴对称跨声速流动。
The new method is used to study transonic flow in cascades and one kind of complex unsteady transonic axisymmetric flow in arc breaker.
本课题以某型压气机的跨音速叶栅为研究平台，以提高叶栅静压增压比，减少叶栅流动损失为目标。
This thesis investigated transonic cascade of a certain compressor in order to increase the static pressure ratio of the cascade and reduce the coefficient of the cascade losses.
叶栅叶片，在反推工作时，使发动机气流向相反方向流动的叶片。
CASCADE vane, a vane for turning the engine airflow during operation of thrust reverser.
分别对可压缩叶栅流场的亚音速和跨音速流动进行了数值模拟计算。
Some cases of compressible flow as well as incompressible flow are presented.
在高速流动条件下，叶栅损失主要是吸力面边界层径向串流及其尾迹。
Under high velocity flow conditions, cascade losses are mainly caused by radial drift of the boundary layer along the suction surface and by blade wakes.
为了详细研究涡轮叶栅的气动特性，深入了解涡轮叶栅流道内的气体流动，对某型涡轮导向叶栅内的流场结构进行了数值模拟。
For investigating the aerodynamic character of the turbine cascades, understanding the detail flow in turbine cascades, the computational investigation was applied on some type turbine guide vane.
通过实例分析，证明这种方法对叶栅绕流等复杂流动现象的模拟是有效的。
Results reveal that the new method is effective for complex phenomenal simulation such as cascade flows.
在低速环形叶栅实验台上圆弧斜槽处理轮毂相对静子扩压叶栅环的旋转频率对叶栅端壁区流动进行了影响实验探索。
An experiment was made in an annual cascade to explore the unsteady flow mechanism of skewed slot hub treatment in removing flow separation near hub.
在大尺寸低速开式叶栅传热风洞中对一种高压涡轮导向叶栅中的流场进行了流动显示实验研究。
The flow field visualization of a straight HP turbine cascade is conducted in a large-scale low-speed open -loop cascade heat transfer wind tunnel.
以此方法模拟了喷管和二维叶栅的多个非平衡态凝结流动，计算和试验测量的压力分布较好地吻合。
The nucleating flows in nozzles and cascades are simulated by this method and good agreement is obtained between experiment and calculation.
根据计算结果对大负攻角条件下叶栅二维分离流动的特点以及攻角对叶栅气动特性的影响进行了分析。
According to the obtained results, the behavior of the separation flow and the effects of negative incidences on the aerodynamic characteristics of cascade are analyzed.
采用离散涡方法数值仿真了不同来流攻角下，固定与动边界叶栅绕流。在设计工况时流动接近定常流动。
The unsteady flow past stationary and oscillating cascade for off-design performance respectively are simulated numerically with the Discrete Vortex Method.
将振动叶栅三维流动数值模拟与振动叶片结构动力学分析相结合，建立了叶片颤振数值分析系统。
The numerical flutter analysis system was formed by the three-dimensional numerical simulation of the vibrating cascade flow combined with the structural dynamics analysis of vibrating blade.
叶栅中部和端部二次流均增强，总平均的二次流动能增大。对于该叶栅，叶片反弯曲亦不能提高叶栅流场的气动性能，直叶片叶栅总损失最小。
For the turbine stator cascade, the negative curving of blade can not improve the performance of the cascades as well, the total losses of straight cascade are the lowest.
经联合造型后的叶栅与原始叶栅相比在各个攻角下的流动损失均有大幅度降低，大负攻角下效果尤为明显。
The combination of the slot with an optimized blade design significantly reduces the secondary flow losses compared to the original turbine stator, especially at large negative angles of incidence.
在不同位置采用五孔探针测量了两种叶栅的气动参数并在叶片表面做了墨迹流动显示。
Aerodynamic parameters of the two cascades are measured by a five-hole probe at different positions and ink trace flow visualization is conducted on blade surfaces.
结果表明：优化载荷分布的叶栅和原叶栅相比，总流动损失明显降低。
The test results have shown that the flow losses of cascades with optimized load distribution are significantly reduced in comparison with the original cascade.
对比数值模拟结果，优化后有效地改善了叶栅流道中的流动状况，级性能有了显著的提高。
After optimization, the flow field in cascade passage is effectively improved, and the performance of stage is improved obviously.
使用FLUENT软件对某型跨音速涡轮叶栅的导叶进行了S_1流面的粘性流动计算。
The present paper computed the viscous flow of S_1 flow surfaces in some transonic turbine vane cascade by using the computational software FLUENT.
本文给出了一个模拟叶栅内准三维定常和非定常粘性流动的数值方法。
A numerical method for the simulation of quasi-3D steady and unsteady viscous flows in cascades has been presented.
本文首先研究气固非耦合条件下的振动叶栅内二维非定常粘性流动。
First, a 2-d unsteady viscous flow in a vibrating cascade is investigated under flow-structure uncoupled conditions.
湿蒸汽流动问题研究对提高蒸汽透平设计水平具有重要意义。本文对级环境下的自发凝结流动和和叶栅中的非均质凝结流动进行了数值研究。
Numerical investigations are implemented on the wet steam flows with homogeneous condensation in a turbine stage and heterogeneous condensation in a cascade.
结果表明：冲角不仅对叶片表面的压力分布，而且对叶片附近的流动状态，特别是在叶栅流道的后半部，有很大的影响。
Results show that incidence affects evidently not only the pressure profile, but also the flows behavior close to the blade profile, especially in the rear part of the cascade passage.
文中通过压气机叶片“修型”叶栅和常规叶栅的对比实验，研究了“修型”叶栅栅后三维流动特征。
A compressor end-modified cascade and its original cascade are compared experimentally to study the three-dimensional flow characteristics at the exit plane of the cascade.
实验结果表明，采用非光滑叶片改变了叶栅出口旋涡结构及流动分布，使叶栅出口的流场趋于均匀，叶片可以随更大的负荷。
The experiment results show that using non-smooth blades can change the exit streamwise vortex structures. The exit flow fields tend to well-distributed. The overall blade losses are reduced.
实验结果表明，采用非光滑叶片改变了叶栅出口旋涡结构及流动分布，使叶栅出口的流场趋于均匀，叶片可以随更大的负荷。
The experiment results show that using non-smooth blades can change the exit streamwise vortex structures. The exit flow fields tend to well-distributed. The overall blade losses are reduced.
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