Flow Control in a Diffuser Channel by Microwave Discharge
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RAFT AND ROCKET ENGINE DESIGN AND DEVELOPMENT
Flow Control in a Diffuser Channel by Microwave Discharge V. A. Vinogradova, D. V. Komratova, *, and A. Yu. Chirkovb a
P.I. Baranov Central Institute of Aviation Motors Development (TsIAM), ul. Aviamotornaya 2, Moscow, 111116 Russia b Bauman Moscow State Technical University, ul. Vtoraya Baumanskaya 5, Moscow, 105005 Russia *e-mail: [email protected] Received February 14, 2020; revised June 15, 2020; accepted June 25, 2020
Abstract—The results of studying the effect on the subsonic flow in the transition diffuser of a microwave discharge for controlling the boundary layer and restructuring the flow are presented. The influence of various methods of installing antennas in the channel and the power in discharge from minimum to maximum in the pulse-continuous mode of generation is shown. The impact assessment was carried out according to the values of the total pressure in the outlet section of the channel. DOI: 10.3103/S1068799820030095 Keywords: microwave discharge, flow control, transition channel.
INTRODUCTION Current trends in aircraft engine development are aimed at improving the performance of engines with smaller dimensions and increased fuel efficiency. In attempts to reduce the size of both the engine as a whole and its individual components with the help of optimal design, acceptable indicators are attained, but not ideal, and only in some rated flight regime. A significant part of the difficulties is associated with changing engine operation parameters caused by the climb and drop in height as well as weather conditions even during cruising flight. However, even in conditions of optimal parameters of the gas turbine engine operation, there are frequent cases of flow separation in the transition channels of blade machines with overall restrictions on the engine and design features of the unit when linking the tracts. In such cases, undesirable negative effects are sought to be eliminated, if possible, by reprofiling the channel contours or using the passive methods of controlling the flow and the boundary layer, such as installing swirls or interceptors and perforating the surface. The similar methods [1] were extensively applied in the 70s of the last century. Flow separation is effectively eliminated by means of passive flow control methods. A big drawback of passive methods is the impossibility of eliminating the negative impact on the rated regime at those times when control is not required, therefore, the active methods of exposure have also been widely used, whether by blowing and suctioning air jets [2, 3], synthetic jet generators [4, 5], installation of dielectric barrier arresters [6] or other plasma formations. The choice of control method is often determined by the design features and the propulsion requirements. With the development of technology, more and more attention is being paid to the methods of energy exposure based on optical methods and gas discharges, for example, spark, glow, pulsating nanosecond, high-frequency arc and streamer one
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