EXPERIMENTAL INVESTIGATIONS OF SERIES OF NONEQUILIBRIUM ELECTRODE DISCHARGE SHEMES IN OBJECTIVES OF IGNITION AND COMBUSTION STABILIZATION IN SUPERSONIC FLOWS

2011 ◽  
Vol 42 (3) ◽  
pp. 289-319
Author(s):  
Vladimir Vladimirovich Skvortsov
Keyword(s):  
Supersonic Flows ◽  
Experimental Investigations ◽  
Combustion Stabilization ◽  
Electrode Discharge ◽  
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.

scholarly journals Systems of ignition and combustion stabilization for water-coal fuel

2012 ◽  
Vol 16 (4) ◽  
pp. 1229-1238 ◽  
Author(s):  
Ivan Zasypkin ◽  
Vasiliy Murko ◽  
Vladimir Fedyaev ◽  
Marina Baranova
Keyword(s):  
Combustion Stabilization ◽  
Coal Fuel ◽  
Ignition And Combustion

scholarly journals Modeling of pulverized coal combustion stabilization by means of plasma torches

2005 ◽  
Vol 9 (2) ◽  
pp. 57-72 ◽  
Author(s):  
Miroslav Sijercic ◽  
Srdjan Belosevic ◽  
Predrag Stefanovic
Keyword(s):  
Numerical Simulation ◽  
Coal Combustion ◽  
Coal Dust ◽  
Pulverized Coal ◽  
Pulverized Coal Combustion ◽  
Plasma System ◽  
Utility Boiler ◽  
Plasma Torches ◽  
Combustion Stabilization ◽  
Ignition And Combustion

Application of plasma-system for pulverized coal ignition and combustion stabilization in utility boiler furnaces promises to achieve certain savings compared to the use of heavy oil burners. Plasma torches are built in air-coal dust mixture ducts between coal mills and burners. Characteristics of processes in the ducts with plasma-system for pulverized coal combustion stabilization are analyzed in the paper, with respect to the modeling and numerical simulation of mass, momentum and heat transfer in two-phase turbulent gas-particle flow. The simulations have been performed for three different geometries of the air-coal dust mixture ducts with plasma torches, for TENTAI utility boiler and pulverized lignite Kolubara-Field "D". Selected results of numerical simulation of processes are presented. The plasma-system thermal effect is discussed regarding corresponding savings of liquid fuel. The results of numerical simulations have been analyzed with respect to the processes in the duct and especially with respect to the influence of the duct shape to a temperature field at the outlet cross section, as a basis for the duct geometry optimization. It has been emphasized that numerical simulation of processes can be applied in analysis and optimization of pulverized coal ignition and combustion stabilization and enables efficient and cost-effective scaling-up procedure from laboratory to industrial level.

Micro-power generation using micro-turbine (moving) and thermophotovoltaic (non-moving) systems

2019 ◽  
Vol 233 (8) ◽  
pp. 1085-1101 ◽  
Author(s):  
Seyed Ehsan Hosseini
Keyword(s):  
Power Generation ◽  
Energy Conversion Efficiency ◽  
Combustion Stability ◽  
Experimental Investigations ◽  
Small Scale ◽  
Special Focus ◽  
Micro Power ◽  
Micro Turbine ◽  
Ignition And Combustion ◽  
Thermophotovoltaic Systems

Combustion-based micro-power generation is a serious candidate for substitution of traditional batteries. As the volume of combustion system decreases to small-scale combustors, ignition and combustion stability are becoming considerable challenges due to short residence time and large heat loss. To overcome these shortages, several experimental investigations have been implemented to generate micro-power using both moving (micro-turbines) and non-moving (thermophotovoltaic) systems. Although the goal of both systems is to generate micro-power via combustion phenomenon, the approaches to the goal is different. Nevertheless, combustion instability and various shortages in burner and combustor have been noticed by several researchers regardless of the micro-power generation method. In this paper, a review about recent development in application of small-scale combustion in micro-power generation and micro-thruster systems using micro-turbine and thermophotovoltaic systems is presented. The special focus of this paper is on flame regimes, fuel/oxidizer mixing, flame stability conditions, heat recirculation, non-equilibrium transport, flame-wall thermal and kinetic couplings, and improvement of energy conversion efficiency.

Scheme of Hydrogen Ignition in Duct with Shock Waves

2014 ◽  
Vol 9 (2) ◽  
pp. 116-127
Author(s):  
Marat Goldfeld ◽  
Alexey Starov
Keyword(s):  
Shock Waves ◽  
Combustion Chamber ◽  
Three Dimensional ◽  
Combustion Stabilization ◽  
Hydrogen Ignition ◽  
Interaction Of Shock Waves ◽  
Recirculation Area ◽  
Three Dimensional Configuration ◽  
High Mach ◽  
Ignition And Combustion

In article results of the analysis of processes of self-ignition and combustion propagation are given in the multi-injector combustion chamber with high supersonic speeds of an air flow. It is established that fuel ignition at high Mach numbers, bringing to flame propagation on all volume of combustor and combustion stabilization, happens not in recirculation area behind a step, and in the field of interaction of shock waves with an boundary layer on walls or behind this area downstream near an angular point of the combustion chamber. The scheme of development of process of combustion in the combustion chamber with significantly three-dimensional configuration is in details considered

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