The jet engine design that can drastically reduce oxides of nitrogenThe NOx pollution problem of hydrogen fueled turbojets and supersonic combustion ramjets (scramjets) was investigated to determine means of substantially alleviating the problem. Since the NOx reaction rates are much slower than the energy producing reactions, the NOx production depends mainly on the maximum local temperatures in the combustor and the NOx concentration is far from equilibrium at the end of a typical combustor (L approximately 1 ft). In diffusion flames, as used in present turbojets and scramjets combustor designs, the maximum local temperature occurs at the flame and is equal to the stoichiometric value. Whereas, in the heat conduction flames, wherein the flame propagates due to a heat conduction process away from the flame to the cooler oncoming premixed unburnt gases, the maximum temperature is lower than in the diffusion flame. Hence the corresponding pollution index is also lower.
Document ID
19780002071
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Ferri, A. (Advisory Group for Aerospace Research and Development Paris, France)
Agnone, A. (Advisory Group for Aerospace Research and Development Paris, France)
Date Acquired
August 9, 2013
Publication Date
August 1, 1977
Publication Information
Publication: Selected Papers on Advanced Design of Air Vehicles