Abstract
This paper describes the aerodynamic design process of the frontal shape for JR300X, which is the prototype of the next generation high speed train by CJR (Central Japan Railway) aiming for the operational speed of 350 kilometers per hour. The first step is to analyze the flow field around the existing JR300series frontal shape by the CFD (Computational Fluid Dynamics) technology. Based on the physical knowledge of the flow field, the conceptual design follows to create the candidate frontal shapes. The geometry is improved by the wind tunnel test as the next step. The candidate shapes are then quantitatively evaluated by CFD under the actual operating condition. The noise measurement test is also conducted at the anechoic wind tunnel to evaluate the acoustic characteristics. The final shape of CUSP is selected as the JR300X frontal shape, which is confirmed to perform low drag and low noise characteristics.
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