MOTROM-Drag reduction on aerodynamic surfaces

Purpose and goal

The long term goal of the project was to increase the possibility of reduced fuel consumption through reduced resistance to air friction against the aerodynamic surfaces of the joints. A specific goal for the project was to expand the understanding of transition so that we can design more efficient engines. This was done by constructing the experiments using the same methods as used for engine design. The technology of vortex generators could be advanced a step to function in pressure gradients, but was still limited in the presence of free stream turbulence.

Expected results and effects

The project has been carried out with a number of test campaigns and two new experimental rigs at Chalmers and KTH, both of which have been commissioned during the project. New results have been developed that extend the basic understanding of how transition to turbulence occurs, and how vortex generators can be designed taking into account pressure gradient and freight turbulence. This will be helpful to develop design methods for jet engines that consume less fuel.

Planned approach and implementation

The project plan was set up with 4 trial campaigns, of which 2 in new rigs. This went well, but with some delays caused by uncertainties in previous projects and staff changes. Technically, it was a challenging idea to take the results of basic research forward to the more complex environment of the jet engine. Here we encountered some problems with the physics that were from the outset identified as risks in the project. This is great progress since we find what is the next challenge for research to take on in order make the technology work.