Download Air Traffic and the Environment — Background, Tendencies and by H.-G. Nüßer, A. Schmitt (auth.), U. Schumann (eds.) PDF

By H.-G. Nüßer, A. Schmitt (auth.), U. Schumann (eds.)

This quantity includes ten papers on air site visitors and the surroundings ready by way of invited specialists for a seminar prepared by means of the German Aerospace learn institution (DLR) on November 15 and sixteen, 1990 in Bonn, Germany.

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Additional resources for Air Traffic and the Environment — Background, Tendencies and Potential Global Atmospheric Effects: Proceedings of a DLR International Colloquium, Bonn, Germany, November 15/16, 1990

Sample text

It is doubtful that this logistic system can be maintained when the aviation, and especially the space industry, have to satisfactorily operate a future worldwide hydrogen enterprise with frequent take-offs and landings. The reason: Almost all commercial hydrogen supplies today come from fossil energy resourcesi only a small percentage is produced electrolytically, and then usually only wherever (surplus) low-cost electricity is available, for example from large hydroelectric dams (Aswan or Norway).

5% + In view of the above, it becomes logical to consider combining highly favourable fuel consumption plus moderate overall press ure ratios with appropriate conditions for reducing NO~ emissions. The classic technical solution to the problem of achievlnQ very good specific fuel consumption as well a~ favourable conditlons for reduced NO x 49 emission lies in the recuperated gas turbine engine with or without intercooler. The relativel~ low overall pressure ratio of the cycle featuring recuperator and lntercooler in comparison with the conventional cycle is illustrated in figure 14.

It is hard to imagine that a hydrogen-fueled aeronautical or space transportation system of huge costs and 10ng time scales can arise, or even be operated, in international competition . The required technology can be developed in competition; this will help the best ideas to surface. But to establish such a system, to equip it with infrastructures and to operate it can probably only be done once, or if international politics does not allow for this, then twice at best (West and East), and in international cooperation .

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