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The streamer observation and LIF detection of the NO molecules and OH radicals were performed during the steady-state positive DC corona discharge at atmospheric pressure. The time relationship between the regular streamer coronas, laser pulse, LIF signal and laser-induced streamer was explained for no time synchronization LIF measurement. Using the corona radical shower reactor, two-dimensional distributions...
In this paper we present a simple and cheap microwave (2.45 GHz) source of microdischarges in argon and neon at atmospheric pressure. The source consisted of a cheap 2.45 GHz microwave magnetron generator and 50... coaxial line terminated with a simple coaxial plasma applicator. The new microwave source of microdischarges operated stable in the form of a smalI plasma jet at absorbed microwave powers...
The pulsed corona discharge in water produces radicals and reactive species, such as O, OH and H202, which can oxidize organic compounds to H20 and CO2. However, the pulsed corona discharge in water generates also shock waves and numerous bubbles, which contains water vapor, oxygen, hydrogen and active species. In this work results of the laser visualization of the gas bubbles flow in a needle-to-cylinder...
The influence of electric fields on the stability and emissions of naturaI gas combustion was investigated at a seven-hole Bunsen burner at pressures p between 0.1 MPa and 1MPa being representative for combustion processes in gas turbines. For the E-field generation a ring shaped high voltage electrode placed above the burner head was used. Self-sustained gas discharge formation was avoided by keeping...
A comprehensive analysis of charged gaseous and particulate species formation in flames and inside the combustors as well as in the exhaust plumes of aero-engines and energetic machines are conducted. Some new experimental and model results which exhibit a role of plasma-chemical processes in the pollutant formation are presented.
Utilization of ionic wind and suppression of dust re-entrainment are important for performance of electrostatic precipitators (ESPs). Use of fibrous collection electrode is one of promising method. lonic wind enhances dust migration towards collecting electrode, and fibers planted vertically on the collecting electrode decelerate ionic wind to prevent backward air flow that causes reentrainment. In...
Non-equilibrium (coid) pIasmas operated at or close to atmospheric pressure have become very important. Recent progress in the operation of corona discharges and dieIectric-barrier discharges and their appIications is discussed. New Iarge-volume appIications include high-power excimer uItraviolet lamps, excimer based fluorescent Iamps and Iarge-area flat pIasma display panels. Novel processes include...
In this work, a recent development of plasma fuel reforming was critically reviewed. The fundamental characteristics, the reforming efficiency and the energy efficiency of the nonthermal plasma reforming of hydrocarbon gases and liquid fuels, and the thermal plasma reforming of liquid and solid fuels will be discussed in detail.
Dielectric barrier discharges (DBDs) generated in screw and pyramid type coaxial reactors with and without cooling and at different power supply and gas flow conditions, as a source of chemically active environment for soil processing are studied in this paper. The results show that in the proposed reactor both generation efficiency of DBDs products (03 and NO) and their concentrations can be controlled...
A calculation algorithm of recovery gas turbine set for variable gas fuel composition has been presented. The change of physical properties of combustion flue gases was taken into account in flow capacity equations that describe the changed operation conditions of an expander. A relationship describing the change of recovery rate of counter-flow recovery exchanger in function of temperature as well...
The article presents results of the research oriented on determining a set of diagnostic relations referring to a special, but relatively common class of turboset defects, consisting in the misalignment of great turbine set bearings with respect to their designed base positions. The paper discusses a collection of types of the diagnostic relations obtained via simulation calculations of the dynamic...
In this study, numerical simulations of 3D viscous flutter were performed and compared with the available experimental results. The calculations were carried out for bending oscillations or the cascade known as the Eleventh Standard Configuration. The developed numerical algorithm solves 3D Reynolds-averaged Navier-Stokes equation together with the Baldwin-Lomax, using the explicit monotonous second-order...
The paper presents two key mathematical models of transient cavitating pipe flow, i.e. column separation model (CSM) and bubbly cavitation model (BCM). Both models investigated in the paper take into account unsteady frictional loss models. The equations describing the CSM and BCM models have been solved using first the method of characteristics and then the finite differences method. The results...
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