Umweltvertraeglichkeitsstudie fuer das Raumtransportsystem SAeNGER. T. 2 Oberstufe

The study for the upper stage has a considerably changed starting point. The oxygen for hydrogen combustion is carried onboard, as a rocket propulsion unit is provided. Thus nitrogen oxide formation in the engine is eliminated. Then in this study only water vapor and hydrogen are to be observed as the two essential exhaust emissions as well as NO formation in the shock wave during ascent and reentry. The overall system is suitable for space transport only. As a result, fictitious use as a frequently used means of transport is eliminated. (orig.)SIGLEAvailable from TIB Hannover: F94B1204 / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekBundesministerium fuer Forschung und Technologie (BMFT), Bonn (Germany)DEGerman

Umweltvertraeglichkeitsstudie fuer das Raumtransportsystem SAeNGER. T. 1 Unterstufe

The central issue of this study was: Will flights of the airbreathing, hydrogen combusting lower stage of the planned S/''ANGER space transport system cause any significant disturbances of the composition of the stratosphere and what consequences would this imply to the ozone contents and radiation balance? The present study on the environmental compatibility of a planned space transport system restricts itself to the lower stage of the SAeNGER space transport system conceived in Germany. This preference of the lower stage had the following reasons: relatively substantiated emission data were available at an early stage; the cruising altitude around 25 km in the ozone layer of the stratosphere indicated an accumulation of the climate relevant emissions water vapor and nitrogen oxides in one layer and thus a potential hazard to the ozone layer; the airbreathing engines of the lower stage, in contrast to the upper stage, lead to nitrogen oxide emissions which together with water vapor increase the concentration of two catalysts that are essentially contributing to ozone depletion in the stratosphere. (orig.)SIGLEAvailable from TIB Hannover / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekBundesministerium fuer Forschung und Technologie (BMFT), Bonn (Germany)DEGerman