A comparatively rapid computational method for an inviscid flow field of a two-dimensional Darrieus-type runner in an arbitrary shaped duct and a draft tube is proposed in the present paper. In the first stage of the computation, the stream function and the velocity potential at any position in the physical plane are obtained by analyzing the flow through the duct by vortex panel method, considering a discrete distribution of vortices along the duct walls. These values are then utilized in transforming the flow field into a reflected plane of flow with parallel walls, considering that the stream function on the wall takes a constant value. In the second stage, the induced flow due to bound and released vortices of the Darrieus blades is analyzed by the image method. The Darrieus blade characteristics, evaluated by this approach with the measured data of forces and moment acting on the blade, and the calculated flow distributions due to the blade actions are shown and discussed for various shaped ducts.
|Number of pages||15|
|Journal||Memoirs of the Kyushu University, Faculty of Engineering|
|Publication status||Published - Dec 1 1996|
All Science Journal Classification (ASJC) codes
- Atmospheric Science
- Earth and Planetary Sciences(all)
- Management of Technology and Innovation