Abstract

Supersonic inlet flow is usually considered to be detrimental to the performance of turbine systems. This paper demonstrates an effective manner to harness power from supersonic axial inflow without swirl. The bladeless axial turbine allows for power extraction from harsh environments with minimal maintenance costs. In a first step, a baseline bladeless turbine is designed and the power extraction is analyzed. The bladeless turbine surface is parametrized in Matlab and subsequently imported into Hexpress (Numeca) to mesh an unstructured grid. The first layer thickness is kept below one for all the simulations. The unstructured mesh is loaded into CFD++ (Metacomp) to solve the three dimensional steady Reynolds Averaged Navier Stokes equations. Second, the work extraction principle is broken down from a three-dimensional unsteady problem into a two-dimensional steady phenomenon. An experimental campaign is outlined and test details are discussed. Finally, after the experimental characterization, the operational envelope and scaling of the bladeless turbine is described for several reduced mass flows, reduced speeds and geometrical features of the turbine (amplitude of the wavy surface, helix angle, hub radius and length of the axial turbine).

This content is only available via PDF.
You do not currently have access to this content.