Study on Environmental issues at Flight of Supersonic Aircraft

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The following major results have been obtrained through research on (1) reduction of sonic-boom. (2) protection of ozone layr and (3) suppression of airport noise, which are environmental issues concerning the next generation supersonic aircraft.(1) Research on reduction sonic-boomThe effects of aircraft configuration and nose bluntness on sonic-boom intensity are investigated with use of near-field pressure distributions by wind tunnel experiment and computational fluid dynamics and extrapolation by "the wave form parameter method". It is verified that the far-field sonic-boom intensity for the low sonic-boom configuration optimally designed is well reduced.(2) Research on ozone layr chemistryConcentration changes of ozone and nitric oxygen are obtained by consideration of solution of two-dimensional equation of fluid motion in stratosphere and simplified chemical reaction of ozone/nitric oxigen. Preliminary experiment of ozone/nitric oxygen within a spac chamber simulating the stratosphere is executed.(3) Investigation of current status of technology of suppression of airport noiseCurrent status and future perspectives on airport noise estimation and engine noise suppression technology are overviewed. The noise reduction by flight operation is also reviewed.