B14-064 UNSTEADY THREE-DIMENSIONAL NAVIER-STOKES SIMULATIONS OF A SMALL SCALE RADIAL FAN USING MULTI-AIRFOIL

概要

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Fluid flow within the turbo machinery is extremely complex. Understanding of such flows is crucial to efforts to improve current turbo machinery designs, and the computational approach can be used to great advantage in this regard. This study presents a finite difference, unsteady Navier-Stokes approach to calculating the flow in a small-scale radial fan. In order to handle the motion of the rotor relative to the static part accurately, the whole computation domain is formed by several sub-domain and zonal grid technique is used. Patched grids are used in the zonal interface. However, since one zone of grid is moving relative to a stationary zone of grid, shift of the grid pints with respect to the static grid points need to be handled. In the present work, an implicit flux conservation technique developed by the first author is used to transfer information between the two patches (zonal interface) that are moving relative to each other. The validity of the technique is tested by comparing the computed mass flow rate, pressure fluctuation etc. with the measured data. A good comparison between theory and experiment is obtained in the case of time averaged mass flow rate. As a whole, the present study led to a good understanding of the complicated unsteady flow behavior in the small-scale radial fan.
一般社団法人日本機械学会の論文
2003-11-30