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Processes
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Plasma Combustion and Flow Control Processes
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Plasma Combustion and Flow Control Processes

A special issue of Processes (ISSN 2227-9717). This special issue belongs to the section "Chemical Processes and Systems".

Deadline for manuscript submissions: closed (31 December 2022) | Viewed by 6725

Special Issue Editors

Prof. Dr. Xi-Ming Zhu

E-Mail Website
Guest Editor
School of Energy Science and Engineering, Harbin Institute of Technology, Harbin 150001, China
Interests: plasma diagnostics; plasma combustion; reaction kinetics; plasma propulsion
Prof. Dr. Ming Zhai

E-Mail Website
Guest Editor
School of Energy Science and Engineering, Harbin Institute of Technology, Harbin 150001, China
Interests: combustion instability; biomass combustion; plasma-assisted combustion
Special Issues, Collections and Topics in MDPI journals
Dr. Bang-Dou Huang

E-Mail Website
Guest Editor
Institute of Electrical Engineering, Chinese Academy of Sciences, Beijing 100190, China
Interests: plasma diagnostics; plasma sources; pulsed discharge; reaction kinetics; plasma flow control

Special Issue Information

Dear Colleagues,

Plasma plays a unique role in the aerospace, energy, and chemical industries. Recently, studies have shown that plasma can significantly affect gas dynamics and is thus useful for flow control, and the active particles produced by plasma can effectively enhance ignition and combustion due to the ions, excited-state atoms/molecules, and free radicals it produces. Due to the unique electromagnetic effects and chemical reaction paths, plasma has a deep impact on the flow state and the combustion process. This Special Issue on “Plasma Combustion and Flow Control Processes” seeks high-quality works, focusing on the latest plasma technologies for plasma-assisted combustion, enhanced ignition, and flow control. Topics include but are not limited to:

  1. Application of plasma in the combustion of new fuels;
  2. Mechanism of plasma-assisted combustion and enhanced ignition;
  3. Plasma flow control processes, including reseach on the boundary layer, vortex, shock wave, ion wind, flow illustration, etc.;
  4. Diagnostic methods related to plasma combustion and flow control.

Prof. Dr. Xi-Ming Zhu
Prof. Dr. Ming Zhai
Dr. Bang-Dou Huang
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. Processes is an international peer-reviewed open access monthly 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 2400 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.

Keywords

  • plasma-assisted combustion
  • flow control
  • ion wind
  • reaction mechanism
  • ignition enhancement

Published Papers (4 papers)

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Research

14 pages, 4577 KiB  
Article
Effect of Positive Bias and Pressure on Plasma Flow Characteristics in a Chemical Vapor Deposition Chamber
by Bisheng Wang, Di Yang, Ximing Zhu, Yang Zhao, Shuai Wang, Jiaqi Zhu and Ming Zhai
Processes 2022, 10(12), 2665; https://doi.org/10.3390/pr10122665 - 11 Dec 2022
Cited by 1 | Viewed by 1941
Abstract
To better understand how positive bias and deposition pressure affect the plasma flow properties in the deposition chamber during the bias-enhanced MPCVD process, a two-dimensional axisymmetric model based on the discharge mechanism of pure H2 was constructed. The coupling process between different [...] Read more.
To better understand how positive bias and deposition pressure affect the plasma flow properties in the deposition chamber during the bias-enhanced MPCVD process, a two-dimensional axisymmetric model based on the discharge mechanism of pure H2 was constructed. The coupling process between different physical field models of the electromagnetic field, plasma, and temperature field in the MPCVD reactor is realized. We studied the influence of positive bias voltage and deposition pressure variation on microwave plasma flow characteristics in the deposition chamber. There was a bias voltage threshold phenomenon in the case of positive bias, and the suitable value range was narrow. Additionally, with the increase in the deposition pressure, the electron temperature in the deposition chamber tends to increase locally and reaches its maximum value when the pressure is approximately 30 torr. It provides new ideas and guidance for optimizing the process parameter setting of the bias-enhanced MPCVD process. Full article
(This article belongs to the Special Issue Plasma Combustion and Flow Control Processes)
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18 pages, 8643 KiB  
Article
Experimental Investigation on Flow Characteristics and Ignition Performance of Plasma-Actuated Flame Holder
by Min Jia, Yinxiang Zang, Wei Cui, Dong Lin, Zhibo Zhang and Huimin Song
Processes 2022, 10(9), 1848; https://doi.org/10.3390/pr10091848 - 14 Sep 2022
Viewed by 1188
Abstract
Improving the performance of flame holders has been a key focus of research on ramjet combustors. The plasma actuator has the potential to improve the ignition performance by manipulating the flow field of the flame holder. In this study, a plasma-actuated flame holder [...] Read more.
Improving the performance of flame holders has been a key focus of research on ramjet combustors. The plasma actuator has the potential to improve the ignition performance by manipulating the flow field of the flame holder. In this study, a plasma-actuated flame holder was designed. The aim of this study is to improve the performance of ramjet combustor by applying plasma discharge to the flame holder. The aerodynamic effects and ignition performance of the flame holder were investigated. The results demonstrated that the induced jet direction of the surface arc discharge was perpendicular to the actuator. The induced jet dissipated faster at lower pressures. The aerodynamic actuation intensity and jet area increased with the number of channels of surface arc discharges. Increasing discharge frequencies can increase the discharge times and jet height. The aerodynamic effects under a microsecond pulse duration were better than those under a nanosecond pulse duration. Actuators installed on the inside surface showed better performance than those installed outside. Under different total flow temperature conditions, the plasma-actuated flame holder significantly extended the ignition pressure limit and increased the combustion efficiency by 9.12% and 4.3% on average, respectively. Full article
(This article belongs to the Special Issue Plasma Combustion and Flow Control Processes)
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14 pages, 3043 KiB  
Article
Investigation on Spectral Characteristics of Gliding Arc Plasma Assisted Ammonia Lean Combustion
by Ximing Zhu, Yang Zhao, Ming Zhai, Pengyi Lv, Weixing Zhou and Bangdou Huang
Processes 2022, 10(9), 1750; https://doi.org/10.3390/pr10091750 - 2 Sep 2022
Cited by 6 | Viewed by 1723
Abstract
Ammonia as a non-carbon fuel is expected to play an important role in the future, but it is difficult to be effectively utilized at this stage due to its flame retardancy and other characteristics. Therefore, we propose to use gliding arc plasma combined [...] Read more.
Ammonia as a non-carbon fuel is expected to play an important role in the future, but it is difficult to be effectively utilized at this stage due to its flame retardancy and other characteristics. Therefore, we propose to use gliding arc plasma combined with a swirl burner to enhance the combustion performance of ammonia. The electrical characteristics, electron density, gas rotational temperature and the distribution of key active species in the burner were studied via optical emission spectroscopy (OES). With the increase of equivalence ratio (EQR), the width of the Hα line decreases significantly, indicating that the electron density shows a downward trend, even as the gas rotational temperature shows an upward trend. When the equivalence ratio was 0.5, the gas rotational temperature increases by about 320 K compared with the pure air condition. During pure air discharge, there will still be obvious NO emission due to the plasma reaction, but with the addition of NH3, the NO content in the emission is significantly reduced. The light intensity of O atoms in the burner gradually decreases with the increase of the equivalence ratio, the light intensity of H atoms increases first and then decreases, and the light intensity of NH shows an upward trend. The reason may be that the plasma discharge effectively strengthens NH3(E)->NH2+H, NH2+H->NH+H2 and other reactions promote the initial reaction step of NH3 which thus effectively strengthens the NH3 combustion. Full article
(This article belongs to the Special Issue Plasma Combustion and Flow Control Processes)
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20 pages, 11003 KiB  
Article
Active Flow Control of a Flame-Holder Wake Using Nanosecond-Pulsed Surface-Dielectric-Barrier Discharge in a Low-Pressure Environment
by Wei Cui, Min Jia, Dong Lin and Mei Lin
Processes 2022, 10(8), 1519; https://doi.org/10.3390/pr10081519 - 2 Aug 2022
Viewed by 1261
Abstract
Flame holders are widely used in ramjet combustors. We propose using surface nanosecond-pulsed surface-dielectric-barrier-discharge (NS-DBD) to manipulate the flame-holder flow field experimentally. The electrical characteristics, induced flow performance, and temperature distribution of NS-DBD were investigated via the electrical and optical measurement system. In [...] Read more.
Flame holders are widely used in ramjet combustors. We propose using surface nanosecond-pulsed surface-dielectric-barrier-discharge (NS-DBD) to manipulate the flame-holder flow field experimentally. The electrical characteristics, induced flow performance, and temperature distribution of NS-DBD were investigated via the electrical and optical measurement system. In the filamentary discharge mode, the discharge energy rose with decrease of the ambient pressure. The discharge pattern of NS-DBD changed from filamentous to uniform around 5 kPa. Starting-vortex intensity and jet-flow angle relative to the wall increased at low pressure. The recirculation zone was asymmetrical at pressures above 60 kPa. The recirculation zone’s area and length were smaller at lower pressures, but when the actuator was operating, the recirculation zone was nearly 11.8% longer. The vorticity increased with pressure. When the pulse width was 300 ns, the actuator had the greatest effect, and the low velocity region (LVR) area and the fuel–air-mixture residence time (FMRT) could be increased by 31.8% and 20.5%, respectively. The actuator had a smaller widening effect on the LVR area at lower pressure. Rising-edge time should increase with pressure to optimize LVR increase; it should be above 300 ns to optimize FMRT increase. We conclude that NS-DBD is a viable method of controlling flame-holder airflow at low pressure. Full article
(This article belongs to the Special Issue Plasma Combustion and Flow Control Processes)
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