Numerical Analysis of Steady Viscous Flow around Rotor and

• Main Authors: Chang, Jeng-Perng, 張正鵬
• Other Authors: Chii-Jong Hwang
• Format: Others
• Language: zh-TW
• Published: 1998
• Online Access: http://ndltd.ncl.edu.tw/handle/24960413002218597534

碩士 === 國立成功大學 === 航空太空工程學系 === 86 === With the lasting enhancement of aeronautic and astronautic industry as well as human beings' dreams for pursing progress, it has been a very esse-ntial task and mission to develop the high-performance gas turbine engines.To understand the flowfield in turbomachines,a numerical approach is ado-pted to solve the Navier-Stokes equation,in conjunction with Baldwin-Lom-ax algebraic turbulence model,so that the behaviors of flow around rotor and stator are investigated.In the present numerical study, a mesh generation technique is used to create the mixed type of grid system which contains unstructured triangular meshes and structured quadrilateral cells in the flowfi-eld. For the time integration, a modified Gauss-Seidal relaxation scheme is adopted. With respect to the spatial treatment,the cell- centered TVD finite volume formulation is introduced. To understand the capability of the above numerical method for the mixed type of grid system, the transonic turbulent flow over a NACA0012 airfoil is tested by using the present approach. Subs- equently, supersonic flow around rotor and stator airfoils with parabolic-arc shapes and subsonic flow around rotor and stator turbine blades are investi-gated.For the computational results, such as the pressure coefficient distribu-tions, contours of pressure, flow velocity vector, density, and Mach number, the phenomenon of steady viscous flow around rotor and stator are studied.