Numerical simulation of flow through cascade in wind tunnel test section and stand-alone configurations

0480677 - ÚT 2019 RIV US eng J - Článek v odborném periodiku
Fořt, J. - Fürst, J. - Halama, J. - Hric, V. - Louda, P. - Luxa, Martin - Šimurda, David
Numerical simulation of flow through cascade in wind tunnel test section and stand-alone configurations.
Applied Mathematics and Computation. Roč. 319, February (2018), s. 633-646. ISSN 0096-3003. E-ISSN 1873-5649
Institucionální podpora: RVO:61388998
Klíčová slova: numerical simulation * experimental investigation * transonic flow
Obor OECD: Fluids and plasma physics (including surface physics)
Impakt faktor: 3.092, rok: 2018
https://www.sciencedirect.com/science/article/pii/S0096300317305015

The paper deals with the numerical simulation of the flow field in a turbine cascade, which corresponds to the tip section of a last low-pressure steam turbine rotor. Considered cascade consists of very thin profiles with high stagger angle. The resulting flow field is complex with interactions of strong shock waves, shear layers and shock reflections. The paper proposes a proper numerical approximation of boundary conditions suitable for cases with supersonic inlet and outlet flow velocities and compares the flow field for two cascade configurations: the first one corresponding to real experiment (cascade with finite number of blades located in the wind tunnel test section) and the second one corresponding to annular cascade. The experimental configuration includes the complicated geometry of wind tunnel. The annular configuration leads to blade to blade periodicity, which is not guaranteed for the experimental configuration. Numerical simulations are based on the Favre-averaged Navier–Stokes equations with SST k–ω turbulence model and the in-house implicit finite volume solver with AUSM-type discretization. This method considers structured multi-block grid. Results are compared with experimental data.
Trvalý link: http://hdl.handle.net/11104/0278063