I'm attempting to design a turbine for a small scale solar updraft tower. It produces between 1-3 m/s of air flow in a 0.3m diameter tower. I'm in need of resources that can guide me on designing the turbine fan. I've already got the Wind Energy Handbook, however I'm not even sure if following the HAWT design theories is appropriate for these flow characteristics. I'm looking for resources I can go to to aid my design, or any tips on what type of fan I should be aiming for.