抄録
In order to quantitatively grasp influence of asymmetry of channel, flow in an eccentric sudden expansion channel in which the channel centers are different on upstream side and downstream side was calculated in Re < 200, where expansion rate was E = 3. The asymmetry of a channel is expressed by an eccentricity B, where a symmetric expansion channel is B = 0 and a channel with one side step is B = 1. Multiple solutions are confirmed in B < 0.35. The critical Reynolds number increases with parabola with respect to eccentricity. Entrance length increases to about 1% according to eccentricity. The reattachment point distance decreases linearly on the short side of a wall of a sudden expansion part and is almost equal except for B = 0 on the long side. The pressure loss coefficient increases due to asymmetry and rapidly as approaching B = 1.
