Special Issue "Under-Expanded Jets"

A special issue of Aerospace (ISSN 2226-4310).

Deadline for manuscript submissions: 31 March 2018

Special Issue Editors

Guest Editor
Dr. Paul Bruce

Department of Aeronautics, Imperial College London, London SW7 2AZ, UK
Website | E-Mail
Interests: high-speed aerodynamics; unsteady compressible flow; experimental methods; transonic/supersonic flow control; experiment/computation comparison
Guest Editor
Dr. Arash Hamzehloo

Faculty of Engineering, Department of Mechanical Engineering, Imperial College London, London SW7 2AZ, UK
Website | E-Mail
Interests: Gas Dynamics; Compressible Flows; Subsonic and Supersonic Jets; Shock Waves and Flow Discontinuities; Aerodynamics; Multiphase Flows; Cavitating and Flashing Flows; Reacting Flows and Combustion; Supercritical Conditions; Numerical Methods for CFD; Advanced Propulsion Systems

Special Issue Information

Dear Colleagues,

Fundamental understanding of the under-expansion process and under-expanded jets is highly beneficial to engineers and scientists of various fields, from aerospace engineering to geophysics. Under-expanded jets are complex high speed flows, which are formed in various engineering applications and devices such as exhaust plumes of aircrafts (rockets and missiles), supersonic combustors, actuators, ejectors and high pressure gaseous injectors. This type of jet can also be observed in geophysical systems (volcanic eruption) and in accidental release of hazardous gases (such as hydrogen) from tiny cracks in high pressure pipelines and reservoirs.

General characteristics of under-expanded jets in the aforementioned examples are similar, however different nozzle diameters, nozzle (hole) shapes, jet/ambient fluids and nozzle pressure ratios would result in significantly different flow behaviours. Although overall structures of under-expanded jets have been comprehensively identified, many specific characteristics and quantitative aspects are still to be determined. Furthermore, there are very limited quantitative data available for under-expanded jets issued form small-size and particularly millimetre-size nozzles. Therefore, this Special Issue aims to provide quantitative insights into the key sonic and mixing characteristics of under-expanded jets particularly those issued from millimetre-size nozzles.

Authors are encouraged to submit high quality manuscripts on analytical, computational (high fidelity modelling) and experimental (advanced quantitative measurement techniques) studies in the field of under-expanded jets. The topics of interest may include, but are not restricted to, free and impinging jets, co and cross-flows, near-nozzle shock structures, Mach disk dimensions and curvature, vortical and coherent structures and shear layers, turbulent mixing characteristics, aeroacoustics and screech tone, shock-shear interactions, viscous effects, farfield characteristics, effects of the ambient medium thermodynamic conditions, effects of the nozzle diameter and topology (lip geometry and exit profile), hydrodynamic instabilities, compressible in-nozzle flows, different jet/ambient fluids, computational modelling with real fluid equation of state and properties, reacting under-expanded jets, numerical methods, such as advanced shock capturing techniques.

Dr. Paul Bruce
Dr. Arash Hamzehloo
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 papers will be 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. Aerospace is an international peer-reviewed open access quarterly 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 550 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.


  • Under-Expanded Jet
  • Under-Expansion
  • Nozzle
  • Mach Disk
  • Shock
  • Shock-Shear Interaction
  • Vortical Structures
  • Coherent Structures
  • Shear Layer
  • Impinging Jet
  • Cross Flow
  • Supersonic
  • Turbulent Mixing
  • Screech Tone
  • Aeroacoustics
  • Reacting Flow
  • Actuator
  • Ejector
  • Exhaust Plume
  • Aircraft
  • Rocket
  • Missile
  • Injector
  • Injection
  • Hydrogen

Published Papers

This special issue is now open for submission.
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