Proceedings ArticleDOI
Design study of a dual-cycle turbofan-ramjet engine for a hypersonic aircraft
G. W. Zumwalt,S. Suwanprasert +1 more
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TLDR
In this article, computer modeling was used with two different designs of an advanced turbofan-ramjet in order to derive performance predictions, and the studies were performed to model weight, length, fuel efficiency and the requirements of the thrust/drag ratio to exceed unity over the entire flight path.Abstract:
Computer modelling was used with two different designs of an advanced turbofan-ramjet in order to derive performance predictions. The engine would enable an aircraft to take-off, accelerate to Mach 5.0, and climb to 90,000 ft. The two concepts included a turbofan with a ramjet annularly wrapped around it and a side-by-side configuration with the ramjet having a rectangular shape and mounted alongside the turbofan. The studies were performed to model weight, length, fuel efficiency, and the requirements of the thrust/drag ratio to exceed unity over the entire flight path. LH2 would be used for fuel and to regeneratively cool the combustion chamber. Turbofan operation with and without afterburner and with and without the ramjet inlet open were examined, as were variable areas for the burners. A side-by-side configuration displayed the best performance predictions, with a ramjet mass flow being 75 percent that of the turbofan and maximum temperatures being equal.read more
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Journal ArticleDOI
Ejector performance at high temperatures and pressures
TL;DR: In this article, the authors investigated the effect of realistic temperatures and pressures on ejector performance and found that mass entrainment performance usually decreased with increasing primary pressure although an aeroacoustic interaction reversed the trend over small intervals.