Dear Colleagues,

Since the 1940s, much effort has been made in studying different types of rockets and airbreathing propulsion systems that can provide high-speed long-range flight capabilities in both low and high Mach number conditions. The development of new propulsion systems has been motivated by higher efficiency, lower emission, and lower cost for space access and high-speed transportation. New combustion devices, such as scramjets and detonation engines, are being developed to accommodate near-limit operational conditions in a variety of commercial and defense systems, such as fast long-range aircraft, affordable and reusable space access systems, and advanced weapon systems for global strike and reconnaissance. These propulsion systems have non-premixed, partially premixed, and shock-induced combustion methods, physical/aerodynamic devices for enhancing fuel-air mixing efficiency, modified chemical kinetics for expanding combustion flammability limit, and optimized flow path design for reducing overall irreversibility. Advanced propellants provide increased performance in terms of the specific impulse, combustion stability, and flight envelope.

The development of experimental techniques and exa-scale computing capabilities for advanced propulsion system design, and new propellants for more energy-efficient, more climate-friendly power/thermal units are critical in the rapid evolution of next-generation advanced propulsion systems. This Special Issue will address the most recent achievements in the development of advanced high-speed propulsion systems.

The topics of interest include but are not limited to:

• Numerical analysis of advance propulsion systems;
• Advanced experimental measurements on flow and combustion dynamics;
• Fuel-air mixing methods in high-speed flows;
• Flame-holding strategies in high-speed flows;
• Pressure-gain combustion;
• Thermodynamic modeling on combined cycle engine systems;
• Novel propellants for ramjet/scramjet propulsion.

Dr. Dan Michaels
Dr. Qili Liu
Guest Editors

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Energies is an international peer-reviewed open access semimonthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2600 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

• rotating detonation engines
• ramjets and scramjets
• rocket-based combined cycle engines
• turbine-based combined cycle engines
• new propellants