Research attentions are focused on elucidating and control of unsteady phenomena that occur in turbomachinery systems such as axial and centrifugal compressors for aeroengines, and in order to clarify complex unsteady flow fields, large-scale experimental researches and numerical analyses are carrying out. The main research subjects are the elucidation and control of the rotating stall and surge phenomena that occur during off-design operation, and the flow structure and loss generation mechanism under the compressor windmill operation that occurs in the high-volume flow operation. In addition, reducing the noise level of discrete frequency tones generated from turbomachinery systems, and elucidating generation mechanism and developing reducing techniques for the turbulent broadband noise are also studying. The main research topics at present are as follows:

1. Influence of rotor blade geometries on the inlet distortion characteristics of the aeroengine compressor,
2. Elucidation and control of rotating stall occurring in impeller and diffuser of centrifugal compressor for aeroengines,
3. Unsteady flow structure in the coexistence state of surge and rotating stall in multi-stage axial compressor,
4. Elucidation of rotating stall inception and swirl mechanism in the centrifugal compressor diffuser for turbochargers,
5. Research on internal flow structure of turbine generators,
6. Noise reduction of air conditioning system for automobiles
7. Prediction and control of unsteady vibration of compressor systems.