Prediction of radial turbine performance
In collaboration with Honeywell International, we performed full-annulus unsteady simulations of radial turbines in a few hours on a desktop.
- 4 NVIDIA Tesla M2090 GPUs
- 1 hour per revolution
- 5-10 million grid nodes
The flow field in radial turbines is highly unsteady. In particular, there is a strong interaction between the rotors and the upstream volute or vanes. Unsteady calculations have historically required significant computing resources, putting them out of reach of the routine design process. However, by running Turbostream on a desktop with GPUs, they can now be performed in only a few hours.
The figures show results from two unsteady simulations: the first containing a volute (Figures 1 and 2) and the second containing vanes (Figures 3 and 4). In the first case, there is a strong once-per-revolution interaction between the volute tongue and the rotor blades. In the second case, the rotor-stator interaction modifies both the shock wave structure and the separation at the rotor leading edge.