Articles you may be interested inCapacitances and energy deposition curve of nanosecond pulse surface dielectric barrier discharge plasma actuator Rev. Sci. Instrum. 85, 053501 (2014); 10.1063/1.4871552Effects of pulse polarity on nanosecond pulse driven dielectric barrier discharge plasma actuators Vortical flow control on a conical fore body cross section using an array of pulsed dc actuatorsThe present work addresses the combined influence of pressure variations and different airflow velocities on the discharge intensity of plasma actuators. Power consumption, plasma length, and discharge capacitance were investigated systematically for varying pressure levels (p ¼ 0.1-1 bar) and airflow velocities (U 1 ¼ 0 À 100 m/s) to characterize and quantify the favorable and adverse effects on the discharge intensity. In accordance with previous reports, an increasing plasma actuator discharge intensity is observed for decreasing pressure levels. At constant pressure levels, an adverse airflow influence on the electric actuator performance is demonstrated. Despite the improved discharge intensity at lower pressure levels, the seemingly improved performance of the plasma actuators is accompanied with a more pronounced drop of the relative performance. These findings demonstrate the dependency of the (kinematic and thermodynamic) environmental conditions on the electric performance of plasma actuators, which in turn affects the control authority of plasma actuators for flow control applications. V C 2014 AIP Publishing LLC.
Absfracf-Theclassical static analysis of the infinite planar diode has been extended to include the effects of finite transverse beam size. Simple expressions have been found for the increase in maximum stable current density over that of an infinite stream for finite cylindrical and strip streams flowing between plates of infinite diodes. The results are also given in terms of stream perveance. The effect of a nonuniform distribution of current across the stream is shown to be relatively small. The fields (or potentials) in the infinite diode and the infinite drift tube vary along only one coordinate; the fields in the present models vary both radially and axially. The motion of the electron or ion stream, however, is constrained to the axial direction by a strong axial magnetic field, so that the current density is constant along the direction of motion.Limiting current in this time-independent type of analysis is established in a special way. Solutions with unidirectional flow for which V(r) > 0 are found for currents increasing from zero. Such solutions cannot be found beyond a certain value of current, and this value is called the limiting current. Energy relations and small-signal stability at this "limiting" value have been discussed by Bridges and Birdsall [91. Beyond this value of current, only solutions with bidirectional flow are expected. A timedependent solution that would show time growth leading to large amplitude oscillations beyond limiting current 191 is only implied and is not presented here.I n Section I, several finite-diameter stream cross sections in a diode are analyzed, and the results checked against experiment. I n Section 11, the effect of adding side walls (making a planar drift tube with ends) is found and the results related to both the diode and infinitedrift-tube solutions. I. FINITE DIAMETER STREAM IN AN INFINITE DIODE'The model for this analysis is a cylindrical stream flowing normal to the electrodes shown in Fig. 1. A variety of radial distributions of current density, including hollow streams and streams with no definite boundary, is allowed; in the latter, b is to be interpreted as a "characteristic" radius. In the configuration shown, electric fields exist outside as well as inside the stream. Some of the field lines from charges located near the center of the region (x = 4 2 ) terminate on the electrodes at points outside the stream; charges located near an electrode thus "see" less electric field produced by charges near the center than if the stream were infinitely broad.' A given current density thus produces less space-charge depression of potential, and the current density necessary to produce limiting is thereby increased. A. Method of XolutionThe problem is to integrate Poisson's equation for the potential. V ( r , x) in two dimensions; V Z V ( r ,2) = -p@, X ) / % .(1)The charge density p ( r , x) is related to the current and velocity by( 2) We use the time-independent, zero-temperature equation of motion for a single-valued velocity,In the infinitely broad diode...
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.
hi@scite.ai
10624 S. Eastern Ave., Ste. A-614
Henderson, NV 89052, USA
Copyright © 2024 scite LLC. All rights reserved.
Made with 💙 for researchers
Part of the Research Solutions Family.