In order to prevent global warming, improving automotive fuel economy has become one of the biggest challenges. Therefore, a lot of attention has been drawn to turbocharging technology. However,“turbo lag”which is a common phenomenon in conventional turbocharger could worsen the vehicle's drivability. To cope with such drawback, a new-concept compressor cover which has non-linear area distribution has been designed with CFD analysis. And, it is experimentally evaluated, and the result shows that the efficiency of new compressor cover at low flow condition increases by 1％. The result of on-engine performance test also shows that this new compressor cover can improve transient response by more than 60％ for low-to-medium engine speed conditions.

Side thrusters are used for cruisers, ferries, fishing boats and so on. The lateral movement of the ship becomes possible by the thruster and the direction of the movement is reversed by changing the rotational direction of the rotor. The flow conditions of the bidirectional flow of the side thrusters are different each other because of the vertical shaft case and it influences the performance, noise and vibration of the thruster. Therefore, the influences of the propeller pitch, solidity and blade number are investigated as a fundamental research of the side thruster in this research and the unsteady internal flow conditions is investigated by URANS. The thrust measurement equipment is established and the thrust is measured and visualization results of the water surface while the thruster working are reported in this paper.