As for transonic compressor cascades, the movement of shock waves in the flow passage affects the aerodynamic characteristics because it produces large pressure fluctuations on the blade surfaces. Therefore, it is important to investigate the unsteady aerodynamic characteristics with shock wave movement. We measured the unsteady pressure on the blade surface in the case where one blade was oscillated in pitch and calculated the unsteady aerodynamic forces using the one-blade oscillation method. It is clarified that the phase angle of unsteady pressure changed by almost 90 degrees before and after the shock wave movement which resulted in large change of energy distribution on the blade surface, the shock wave movement led into a stability side aerodynamically, and the oscillating blade and the adjacent blade located upstream have dominant effect in flutter characteristics.

In order to clarify the flow fields with the effect of tip clearance, the experimental investigations were carried out. The test fan is radial-outflow type diagonal flow fan similar to centrifugal fan and its specific-speed is 670 (min^-1, m³/min, m). The velocity fields at rotor outlet were measured using a single slanted hotwire probe. And, the pressures on outer casing wall were measured using a highly responded pressure transducer. With regard to the difference of tip clearance, the performance was not obviously different at high and low flowrate, but was much different near design flowrate. Near design flowrate, the tip leakage vortex was occurred. At high flowrate, the separation on blade pressure surface was occurred.

In this paper, the 2-D wave tank tests for the fixed oscillating water column (OWC) type wave energy converter with an impulse turbine were conducted to obtain the experimental data needed to establish this design method. Firstly, the steady air flow test for a single impulse turbine was conducted to grasp the characteristic of the turbine without the effect of water waves. Secondly, the oscillating air flow tests by water waves were carried out to obtain the performance of the OWC type wave energy converter with the same impulse turbine in waves. As the results, the effects of the air chamber length and wave length on the generating efficiency corresponding to product of the primary and secondary conversion efficiencies are clarified.