Fig. 11 shows the blade flow angle distribution of the blade type A and B. The solid lines show the blade flow angle distribution of un-deformed blade type A and B. The dashed lines show the blade flow angle distribution of deformed blade type A and B. The largest variation of blade flow angle occurs at the blade leading and trailing edge in both blade type A and B. For
both cases, blade flow angle increases at the leading edge but blade flow angle decreases at the trailing edge. The change of the blade flow angle at the trailing edge is close to 1°. However,
at the leading edge, the blade flow angle of blade type A and B changes by 1.5° and 1.0°, respectively. The incidence and exit flow angle of the blade under operating condition can be predicted by using one-way FSI simulation. Furthermore, it is necessary to consider the change of the blade flow angle due to the impeller deformation.