Ignition and combustion in ducted, turbulent, supersonic flow

1970 ◽  
Author(s):  
K. BRAY
Keyword(s):  
Supersonic Flow ◽  
Ignition And Combustion

scholarly journals Stabilization of combustion front in supersonic flow using streamer’s discharge

2018 ◽  
Vol 209 ◽  
pp. 00017
Author(s):  
Pavel Bulat ◽  
Lev Grachev ◽  
Igor Esakov ◽  
Vladimir Upyrev
Keyword(s):  
Supersonic Flow ◽  
Combustion Front ◽  
Fuel Injector ◽  
Streamer Discharge ◽  
Plasma Ignition ◽  
Combustion Stabilization ◽  
Comparison With Experiment ◽  
Ignition And Combustion ◽  
Flat Flow ◽  
Stabilization Of Combustion

Thermodynamic analysis shows that for flights with velocities exceeding six sound velocities, it is required to burn fuel not in a subsonic but in a supersonic flow. The aim of this work is to investigate the possibility of creating a stationary combustion front in a supersonic flow by igniting the mixture with an attached microwave discharge. Discharges are created on the resonator by means of a pulsed source of quasi-optical microwave radiation. This method of initiation is one or two orders of magnitude more economical than other known methods of plasma ignition and combustion stabilization. A numerical evaluation and comparison with experiment of the propagation velocity of a subcritical streamer discharge in a stationary medium and in a supersonic drifting flow are performed. Experiments have been conducted to ignite a flat flow of propane-air mixture, as well as ignition of the propane stream fed into the airflow, which simulates the operation of the fuel injector. In all cases, the experiments confirmed a steady fuel combustion, which was controlled by the temperature measurements with a thermocouple.

Arc Discharge as a Means for Ignition and Combustion of Propane-Air Mixture Supersonic Flow

2006 ◽  
Author(s):  
Andrey Aleksandrov ◽  
Vladimir Bychkov ◽  
Vladimir Chernikov ◽  
Alexei Ershov ◽  
V. Gromov ◽  
...  
Keyword(s):  
Supersonic Flow ◽  
Arc Discharge ◽  
Ignition And Combustion

scholarly journals Effects of Additional Cavity Floor Injection on the Ignition and Combustion Processes in a Mach 2 Supersonic Flow

Energies ◽  
2020 ◽  
Vol 13 (18) ◽  
pp. 4801
Author(s):  
Fan Li ◽  
Mingbo Sun ◽  
Zun Cai ◽  
Yong Chen ◽  
Yongchao Sun ◽  
...  
Keyword(s):  
Supersonic Flow ◽  
Flow Field ◽  
Equivalence Ratio ◽  
Minor Effect ◽  
Ignition Process ◽  
Injection Scheme ◽  
Fuel Jet ◽  
Ignition And Combustion ◽  
Combustion Processes ◽  
Cavity Floor

Effects of additional cavity floor injection on the ethylene ignition and combustion processes in a cavity-based scramjet combustor are investigated experimentally in a Mach 2.0 supersonic flow using flame luminosity and CH* (CH radical) spontaneous emission methods and static pressure measurements. Numerical calculation is performed to study the non-reacting flow-field structures prior to ignition. Two injection schemes, including the cavity upstream injection scheme and the combined injection scheme with an additional cavity floor injection, are compared to study the effects of the additional cavity floor injection on the ignition and combustion processes. It is found that there exists an equivalence ratio upper limit for maintaining stable combustion for the cavity upstream injection scheme. As the equivalence ratio further increases, the fuel jet penetration is improved accordingly, and thus, the interaction between the fuel jet and the cavity is weakened, which can lead to the ignition failure and flame blowout during combustion. On the contrary, although the combined injection scheme has a minor effect on combustion enhancement at the same global equivalence ratio, it can also provide a more favorable flow-field environment that enables more successful ignitions and better flame stabilizations. For the combined injection scheme, as the equivalence ratio increases, the initial flame propagations are observed to perform different routines during the ignition process, and the major combustion reaction zone tends to move further downstream the cavity shear layer. It is concluded that the advantages of the combined injection scheme with an additional cavity floor injection are more significant when the equivalence ratio is higher, as well as that the interaction between the fuel jet and the cavity becomes weaker.

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