抄録
In this study, we examined accuracy of the flow simulation over a turbine blade on Cartesian grid using virtual flux method. In the simulation, we used 2-dimensional compressible Navier-Stokes equation for governing equation and set Hodson's linear cascade for the simulation model. For the first stage of this study, Reynolds number is set for Re = 1.0 × 10^4, which is lower than that of the actual flow around the turbine blade. We evaluated accuracy of the flow simulation by comparing pressure coefficient distribution and Mach number distribution on a turbine blade's surface with respect to grid resolution (100 and 200 cells for a chord length). As a result, we got accurate pressure coefficient and Mach number distributions from the flow simulation in the order of Re = 10^4 on Cartesian grid (200 cells for a chord length). However, since the order of Reynolds number of the actual flow around the turbine blade is Re = 10^5〜10^6, higher grid resolution is required to simulate the actual flow field such as boundary layer accurately. To simulate the flow field near the turbine blade, we apply multi-block method to the flow simulation and set higher grid resolution in future work.
