Next generation supersonic transports (SST)should have not only better aircraftperformances but also less environmentalimpacts including sonic boom, emissions, andengine noise. With an increasing concern overthe environmental and energy problems,alternative fuels have risen in significance. Inthis context, the authors have conducted aconceptual design study on LH2-fueled SST.In order to obtain a solution which hasbetter aircraft performances and lessenvironmental impacts, airframe and propulsionsystem integration is needed. By using ourconceptual design environment, a globalanalysis on LH2-fueled SSTs has beenconducted in comparison to kerosene SSTs.The result of the global analysis has shownthat the optimum cruise altitude of LH2 SSTs ishigher than kerosene SSTs. In addition, one ofthe active constraints which determine thefeasible design space is climb capability atcruise altitude. Then, suggestions have beenmade for improving the feasibility.
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