QUASI-THREE-DIMENSIONAL AND FULL THREE-DIMENSIONAL ROTATIONAL FLOW CALCULATIONS IN TURBOMACHINES.

Progress in the development of quasi-three-dimensional and full three-dimensional numerical solutions for steady subsonic rotational flow through turbomachines is presented. An iterative calculation between the flow on a mean hub-to-tip S//2 stream surface and a number of blade-to-blade S//1 stream surfaces gives the quasi-three-dimensional solution, which is very easily extended to give full three-dimensional solution by merely calculating a few more S//2 surface flows and relaxing the restriction that S//1 surfaces are surfaces of revolution. A new S//2-S//1 iteration scheme has been developed and employed in the code. The results obtained by applying this computing system to the design and determination of full three-dimensional flow field of a two-stage axial compressor and a high subsonic compressor stator are obtained and shows clearly the amount of the twist of the general S//1 surfaces and the difference in the flow field between the quasi-three-dimensional and full three-dimensional solutions.