... al., 2020 ; Ruf et al., 2020 ; Hebling et al., 2019).This is mainly due to the comparatively high energy density of hydrogen-based FC systems compared to battery-based propulsion concepts. Other advantages include fast refueling, independent scaling of energy and power...

... thrust (T) and shaft speed (η) nonlinearities: (5) T = 3.881 × 10 1 − 4.469 v t + 4.663 × 10 − 1 v t 2 (6) η = 2.878 × 10 4 + 4.021 × 10 − 1 v s + 1.532 × 10 − 6 v s 2 UAV Propulsion Direct-thrust...

... can be approximated at higher engine power levels (Figure 3). Performance measurement Propulsion Instrumentation Acoustics Flight instrumentation Other concerns exist for sensors that are exposed to flow, and perhaps the greatest among these is hydrodynamic pressure fluctuations from...

... Propulsion Combustor Turbojet In the gas turbine historical period, they realized there were lots of technological improvement, and this technology has been an important part of our industry. Today, transportation and expending industry requires much more energy, and this demand is growing up day...

... efficiency of the rotor by approximately 25 per cent. Practical implications The possibility to increase the efficiency of a cycloidal rotor by acting on its pitching schedule could be a significant factor of success for this alternative propulsion concept. Originality/value The present work...

...Riti Singh; Christopher Perullo; Dimitri Mavris Purpose – The purpose of this study is to examine state-of-the-art in hybrid-electric propulsion system modeling and suggest new methodologies for sizing such advanced concepts. Many entities are involved in the modelling and design of hybrid...

...Riti Singh; Peter Malkin; Meletios Pagonis Purpose – The purpose of this paper is to describe the necessity for the use of fully superconducting electrical power systems (SEPS) in future hybrid electric aircraft which facilitates the use of a distributed propulsion system. Design/methodology...

... is its ability also to evaluate and optimize the propulsion system performance in a complex scenario of intricate 3D geometry under uncertainty. The study shows the objective function to maximize the average thrust in dual levels could be achieved by the proposed optimization technique while satisfying...

...Greg S. Mungas; Debendra K. Das; Devdatta Kulkarni Small hybrid rocket motors using solid propellant and gaseous oxidizer are becoming increasingly popular as a propulsion device. This paper describes the development of a one‐dimensional flow model for the design of a small rocket motor. Combustion...

...Forrest Bishop Several spacecraft beam‐propulsion concepts are introduced. “Mesoparticle beam propulsion” uses a collimated beam of mesoscopic particles, very roughly on the order of a nanogram mass each. Molecular nanotechnologies may permit the inclusion of entire guidance systems in each...

...Zbigniew Dżygadło; Witold Perkowski The supercritical propulsion shaft equipped with a dry friction damper has been designed for a polish ultra light helicopter named IS‐2. Models of the shaft and the damper and some results of analysis of the shaft flexural vibrations are presented.As it turned...

... © MCB UP Limited 2001 --> Rolls-Royce Awards Propulsion Sir Roy Fedden Award winner The award, made by the Royal Aeronautical Society (RAeS), is presented for outstanding aerospace propulsion research. Dr Marshall's successful submission dealt with measuring...

...Colin R. McInnes A range of space systems engineering technologies are currently under development at the University of Glasgow. Much of this work centres on advanced propulsion (solar sailing and tethers) which is complemented by studies on space robotics and spacecraft autonomy. This paper...

... © MCB UP Limited 2001 --> NASA Satellites Propulsion Electromagnetic induction Keywords: NASA, Satellites, Propulsion NASA scientists have come up with another application. Scientists at NASA's Marshall Flight Centre in Huntsville, Alabama, plan to apply...

...J. Yin; P. Pilidis; K.W. Ramsden; S.D. Probert The requirements imposed upon advanced short take‐off and vertical landing (ASTOVL) aircraft give rise to challenging demands on their propulsion systems. One possible approach is to have a high‐performance turbofan of traditional design...

...Changduk Kong The propulsion system integration of a turboprop aircraft, which has been developed for the basic trainer, was performed. The proper turboprop engine was selected among worldwide existing engines by the specific developed engine selection technique and trade‐off studies...

... Keywords Propulsion, Satellites, Thrust Atlantic Research Corporation (ARC) has a contract with the Air Force Research Laboratory under the integrated High Payoff Rocket Propulsion Technology (IHPRPT) program to demonstrate a complete 4.5Kw high performance Hall effect propulsion...

... © MCB UP Limited 1998 --> Gas turbines Propulsion Publication Software Aerothermodynamics of Gas Turbine and Rocket Propulsion (revised and enlarged edition) Gordon OatesMarch 1997452 pp. (pr and disk)ISBN 0-930403-34-7£52.95 Keywords Gas turbines, Propulsion...

... © MCB UP Limited 1998 --> Aircraft Lockheed Corporation Patents Propulsion Propulsion system Keywords Aircraft,Lockheed Corporation, Patents, Propulsion In world patent 9505 307 Lockheed Corporation describes a propulsion system for lighter than air vehicles...