#AIRFOIL SIMULATION MOD#

Steady-state and transient results are compared to experimental data in order to analyze the ability of the transition and turbulence models to appropriately handle the known transitional nature of the flow, where it is shown that RANS simulations with adequate mesh resolution can produce similar separation behavior as seen in experiments without the use of transition modeling.

#AIRFOIL SIMULATION MOD#

Turbulence mod els employed are the Abe-Kondoh-Nagano linear low-Re k-epsilon (AKN) as well as the AKN with Kato-Launder modification, denoted MPAKN. All blade profiles are known to be susceptible to varying degrees of laminar flow separation along the suction surface. Three blade profiles have been simulated and a fourth is planned, including the aft-loaded Pack B which has a nominal Zweifel loading coefficient (Zw) equal to 1.15, the mid-loaded L1M (Zw=1.33), the front-loaded L2F (Zw=1.59), and the aft-loaded L2A (Zw=1.59).

Bryan Arko (MS in Engineering 2012) is using a Reynolds- Averaged Navier-Stokes (RANS) finite volume flow solver ( SC/Tetra) to simulate the low Reynolds number flowfields around a two-dimensional linear turbine cascade model that matches the wind tunnel test section of the Air Force Research Lab at Wright-Patterson Air Force Base. These unsteady processes include separated flows, vortex shedding, and the transition from laminar to turbulent flow.Д¬omputational Study of High Lift Low-Pressure Turbine Cascade Aerodynamics at Low Reynolds NumberДesign trends for the low-pressure turbine (LPT) section of modern gas turbine engines include increasing the loading per airfoil, which promises more power per stage or a lower airfoil count and thus a lower total weight of the engine. Studying low Reynolds number flows can be very challenging due to the unsteady phenomena that occur as size and speed get smaller. Technically, the Reynolds number describes the ratio of inertial (momentum) to viscous forces, where fluid flowing over a larger body or at higher speeds usually has higher Reynolds numbers. The Reynolds number is a non-dimensional parameter commonly used in fluid dynamics to qualitatively categorize the type of flow physics encountered in a specific situation. Our interest in studying low Reynolds number flows isДЇocused on improving the performance of airfoils used in turbomachineryДЄnd as aircraft wings. Physics of the flows around the airfoils, and then optimize performance We use theoretical,Д®xperimental, and computational investigations to learn about the We're also interested in various methods used to Turbine airfoils routinely have higher camber thanДЄircraft wings, but in general, the flow physics are very similarД«etween geometries. Airfoils are used to convert fluid motion into useful work or lift, both in turbomachinery and aircraft wings.

Airfoil simulation