摘要
过去研制一种新叶型需要做大量实验以确定其安装角、ｔ／ｂ（栅距／弦长）及出口几何角的使用范围，在可使用范围内还需要确定叶栅的攻角特性。这些在热力透平机械设计过程中是不可缺少的。随着计算机的发展及叶轮机械计算流体动力学的进步，人们已经可以通过主要是数值计算的方法来获得这些特性。本文给出了分析叶栅内二维流动特性的一种数值计算方祛。作者采用压力修正ＴＶＤ格式解雷诺平均的Ｎ－Ｓ方程组，壁面的湍流效应利用低雷诺数湍流模型模拟。运用本文方法计算了跨音及亚音叶栅内的湍流流动，并获得了某新叶型的使用范围及攻角特性。
The present Numerical method is based on the pressure correction procedure,which solves Reynolds averaged Navier-Stokes equations closed with low Reynolds number K-εturbulence model in two-dimentional body-fitted coordinate system.The MINMOD TVD scheme is used.The present code can be applied to both incompressible flows and compressible flows at all speeds.The application in the present paper is calculation of two-dimensional turbulent flows through a newly designed steam turbine blade.There are behaviors of a blade profile such as variation of loss against attack angles and relation among stagger angle,pitch to chord ratio and exit geometric flowangle,as well as load distribution along blade surface.These are extreamly important for engineers to stack three-dimentional turbine blade from two-dimensional blade profiles.Engineers usually do research works completely by experiments in wind tunnels.However,The present authors depended mainly on our CFD code to analyse two-dimensional aerodynamic chaxacteristics of turbine cascades.
出处
《工程热物理学报》
EI
CAS
CSCD
北大核心
1996年第4期411-416,共6页
Journal of Engineering Thermophysics
