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

摘要

In the frame of development of the methods of ignition and combustion stabilization at regimes when existing approaches are not effective enough or, in principle, impossible (poor mixtures, low temperatures and pressures in high-velocity flows), the investigations are fulfilled with the use of electrical discharges in which electron temperature is considerably higher than neutral molecule temperature, which raises the probability of molecule excitation and intensified plasma-chemical reactions. Development and investigation results of a series of constructions (modules) with the use of such discharges at TsAGI are presented. These constructions have low aerodynamic drag and, in perspective, can be used as pilot flame modules. Exoenergetic reaction product distribution peculiarities are considered in such modules in a supersonic flow (M = 2) at low static temperatures (～160 K) and pressures (～260 torr) at propane use as a fuel. Investigation results are given for the module in which a traditional approach of combustion intensification with the use of a screen chamfered toward the flow and arranged on a plate and nonequilibrium discharge are combined at kerosene use as a fuel. One of the basic methods of study is the registration of emission spectra. It is shown that processes in those modules undergo with the origination of active radicals and atomic hydrogen and oxygen that are active themselves in the chemical relation. The plasma-chemical reaction zone carryover has been registered in the supersonic area of the flow.