A shallow-water flow in gutter is one of pico-hydropower. In order to extract the power effectively, a Darrieus turbine system of dammed type has been proposed. By adopting a portable type of turbine system, a flood due to heavy rain or blockage of garbage flowing might be avoided. Due to dammed type turbine, the upstream water level of the turbine becomes higher than the downstream one. The head difference between the up- and the down-streams of the dammed type turbine contributes the power generation further increasing in comparison with no dammed type. In the case of a shallow flow, as the upstream water level is higher than the blade span-length of Darrieus turbine with the vertical axis, a whole of water enters over the full of span length in upstream path of Darrieus blade rotating while water passes over only a lower part of it in downstream path of blade rotating. In order to clarify the guiding line of the higher performance design of Darrieus turbine in the case of a shallow-water flow in gutter, a dammed type of turbine was examined experimentally. As the result, the effect of downstream water level against the blade span length on the performance is cleared after the relation between the inclination of gutter and the turbine performance was reconfirmed.

As the temperature of the air compressed by turbocharger becomes very high, it sometimes causes problems in combustion such as engine knocking or pre-ignition. Therefore, in order to prevent deterioration of engine performance, intercooler is used to cool the compressed air for turbocharged engine.

To overcome such a problem, new compressor which has dual water-cooling passage is developed. Not only can it reduce the size of the inter-cooler, but it can also improve the compressor pressure ratio at low flow rate condition, and prevent deposit formation. In this paper, we discuss internal flow analysis and experimental test of the compressor. In the future, we are planning to carry out further development for actual application.

In order to maximize the effect to improve an axial compressor aerodynamic performance due to the casing treatment (CT), it is necessary to clarify influences of the CT on the flow behavior in a tip region of compressor rotor which affects the inception of rotating stall. In this study, as a previous step to investigate the above influences, flows in a linear compressor cascade with tip clearance were analyzed numerically with a parameter of incidence angle so as to examine the basic tip leakage flow behavior at low flow rate. The computed result clarified that a flow through near the endwall in the tip clearance has a relatively large effect on the separation of the tip leakage vortex from the blade suction surface.

Centrifugal pumps are used for the transportation of oil and low viscous liquid in addition to water. In the previous research, the centrifugal pump with β₁=β₂=90° applied for the low viscous liquid, ex. sake and sucrose aqueous solution, was investigated and the performance and internal flow were clarified. Since the viscosity of liquid for food is higher than that of water and the friction loss inside the pump become large, the number of blades may be reduced and the blade outlet angle may be adjusted in order to keep adequate head. Therefore, four blades with the different blade outlet angle are prepared and the performance test and numerical analysis are conducted. In this paper, the performance of the experiment and numerical analysis is compared and the internal flow condition in axial section including the clearance region of back shroud is clarified by the numerical analysis result.