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As an integral element of automotive wiper systems, an automotive washer system is designed to contribute to the security and safety of automobile-based societies by providing drivers with a clear field of vision. Washer fluid is discharged from washer nozzles, typically mounted on the engine hood, to distances of more than 300 mm across the windshield. However, the fluid discharged may fail to reach targeted areas due to the effects of wind pressure when the vehicle is moving at high speed or due to the increased viscosity of methanol in the washer fluid (at concentrations of 30-60 %) at low temperatures, resulting in failure to ensure a clear field of vision. We developed a self-oscillating washer nozzle to remedy these shortcomings of conventional washer systems. Based on CFD and optimization, the flow passage is designed to generate a stable discharge of washer fluid, even under conditions of high-speed air flow or low temperature.

In this study, with the aim of achieving a high-efficient, low-noise and light-weight radiator cooling fan, the authors have conducted the visualization experiment and the CFD analysis of air flows around fans, and finally developed a new propeller fan whose blades are connected together by a ring formed inward from their tips. Owing to this ring, the fluid noise due to vortices caused by blade tip etc. was reduced by approximately 2dB. In addition, the fan efficiency was improved by around 5 points by modifying the shape of the ring so as to facilitate smooth air flow to it. Since the strength of the blades was reinforced by connecting them with the ring, the blade thickness was decreased and, as a result, the fan weight was reduced by 20g.