Generation of Supersonic Swirling Flow Using Asymmetric Nozzles (3rd Report, Flow Field Evaluation by Numerical Analysis)

摘要

To improve the performance of disk MHD generators, it is suggested to install inlet swirl vanes to introduce azimuthal velocity component in the supersonic inert working gas flow at the inlet of the generator channel. But, currently used swirl vanes employing symmetric nozzles has a problem that flow field non-uniformity in azimuthal direction grows due to incompleteness of the nozzle design. For solving this problem, some swirl vane design methods using asymmetric nozzles are proposed. Technical validity of these design methods from the viewpoint of flow field uniformity is evaluated by numerical simulation of two-dimensional turbulent flow. Finally, design optimization of the nozzles is discussed for introduction to disk MHD generator.