Abstract
So-called "cold-jet" propulsion units consist of a piston engine, a blower and the necessary air duct. Till now, all attempts to utilize "cold-jet" propulsion units to maintain the thrust of an airplane have been unsuccessful. Analysis has shown that the main difficulty is the deformation of the flow field at the entry to the blower [1].
Highlights
IntroductionAnalysis of engines used nowadays for the Micro-light Aircraft category shows that their effective power output is insufficient for “cold jet” propulsion of a small aircraft
The department of Aircraft Engineering at the Czech Technical University in Prague is developing a light aircraft powered by a ducted fan (“cold-jet”) propulsion unit
The plane is a replica of the well-known Czech L-39 training jet plane
Summary
Analysis of engines used nowadays for the Micro-light Aircraft category shows that their effective power output is insufficient for “cold jet” propulsion of a small aircraft. The ducted fan and the inlet channel are designed to keep a laminar boundary layer. The inlet channel is designed to keep a laminar boundary layer all along the channel length. In this case, the minimum inner energy of the flow will dissipate. Our boundary layer calculation [5] shows that the optimum channel cross-section taper is 0.54 per 1 m of channel length (Fig. 3). To maintain the laminar boundary layer throughout the length of the channel, it is important to continually downsize the cross-section areas of the channel [2 and 3].
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