| 摘要 |
PROBLEM TO BE SOLVED: To stably take a numerical analysis of a flow between turbo machine blades with high precision by using the grid which has orthogonality to a wall surface in an area at a constant distance from the wall surface such as a blade surface and a side wall except nearby the front and rear edges of blades. SOLUTION: Aξaxis is set along the flow in a calculation area for the flow between blades and aηaxis is set crossing the flow to generate an H type grid. This calculation area is divided into a blade surface nearby area consisting of a nearby area 5a of a blade negative pressure surface 4a, a nearby area 5b on a pressure surface side 4b and another area 6, and the grid in the area 5 is generated algebraically so that grid linesηcross the wall surface 4 completely at right angles. The grid in the area 6, on the other hand, is smoothed by using an elliptic type partial differential equation so that the whole grid system is applicable to an arbitrary inter-blade flow passage. Further, the grid in the area 6 is so generated that grid point coordinates, gradients of the grid linesη, and the variation rate of the grid widthΔj are continuous respectively on the boundary surface Sηbetween the areas 5 and 6.
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