Fig. 9 shows the meridional tip profile distribution of the blade type A under operating condition. Green line indicates the casing curve. Un-deformed blade tip profile (blue line) changed to deformed blade tip profile (red line) due to the combination loads. In this study, thermal growth of the casing was ignored because the temperature difference between impeller inlet and diffuser outlet is about 30 °C at operating condition. The largest variation of tip clearance occurs at the leading and trailing edge of the blade.