Effects of RSM turbulence models in anticipating flow field in a stator vane passage

A thorough 3D numerical study was conducted to simulate the flow field inside a C3X stator vane using a commercial software. The design flow turning angle is 71 degrees and the axial chord is 7.816 cm. The influence of grid resolution was investigated in order to obtain information about the requirements of a grid-independent solution. Because the flow field in turbines is complex, and RSM models capture these complexities better than two-equation models, investigation of these models can be helpful. Three different standard Reynolds stress models (LRR-IP, LRR-QI, SSG) which are based on the ε-equation and two omega-based Reynolds stress models (baseline RSM, omega RSM) are used to predict the bladeloading and other characteristics of the flow field. The diversity of the standard RSM models is in the type of modeling the pressure-strain correlation, which is the most important term in Reynolds stress models. The variations of pressure, vane temperature, total pressure loss and viscosity ratio are examined for different turbulence models. The comparison of the numerical results with experiments clearly reveals good correlation between them. Also it should be indicated from this study that the static pressure distribution around the blade which is an importantcharacteristic of the blade, is not sensitive to the turbulence model and can be achieved by solving Euler equation but it doesn't give good results fortotal pressure loss and temperature distribution

کلیدواژه ها:

ε-based RSM turbulence model ، ω-based RSM turbulence model ، Euler equation