Bulletin of the American Physical Society
71st Annual Gaseous Electronics Conference
Volume 63, Number 10
Monday–Friday, November 5–9, 2018; Portland, Oregon
Session NR3: Plasmas in Aerodynamics |
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Chair: David Pai, Institut PPRIME Room: Oregon Convention Center A106 |
Thursday, November 8, 2018 8:00AM - 8:15AM |
NR3.00001: Fully coupled plasma, flow and combustion modeling of nanosecond pulsed discharge for combustion ignition . Ashish Sharma, Vivek Subramaniam, Evrim Solmaz, Laxminarayan Raja We perform computational studies on a nanosecond pulsed plasma induced flame ignition for an H$_{\mathrm{2\thinspace }}$- air mixture under high pressure conditions. The non-equilibrium plasma model is based on a self-consistent, multi-species, multi-temperature continuum description of the plasma while the flow model is based on the reactive compressible Euler equations. The goal of the current work is to 1) Study the formation of combustion-enhancing active species radicals O, OH and H during the plasma evolution phase 2) Study the influence of active reactive species O, OH and H on flame ignition of a H$_{\mathrm{2}}$ -- air mixture and 3) Consistently resolve plasma induced flame ignition using a fully coupled plasma --reactive compressible flow model. We perform 1D and 2D simulations to identify the parameters governing the plasma evolution for successful flame ignition. [Preview Abstract] |
Thursday, November 8, 2018 8:15AM - 8:30AM |
NR3.00002: Experimental investigation toward thrust improvement in multiple-electrodes plasma actuator Haruki Furukawa, Shintaro Sato, Masayuki Takahashi, Naofumi Ohnishi In recent years, dielectric-barrier-discharge (DBD) plasma actuators have attracted attentions as a fluid control device. However, a flow velocity induced by a single DBD plasma actuator is insufficient (about several m/s) to control a large-scale flow. It is effective to arrange several DBD plasma actuators to induce a higher velocity flow, which is called by the multiple-electrodes plasma actuator. Electric field inducing a counter stream against the main flow is formed when the distance from the neighbor electrode is too small in the multiple-electrodes plasma actuator. The counter stream interacts with a downward stream induced by the upstream plasma actuator, which decreases the flow control performance. The interaction between the downward and upward streams is known as the ``cross-talk'' phenomenon. In this study, we improve the thrust performance in the multiple-electrodes plasma actuator by changing an electrode arrangement to suppress the ``cross-talk'' phenomenon. The electrode arrangement dependence of the thrust performance is examined by conducting a discharge experiment using multi-electrodes plasma actuator. [Preview Abstract] |
Thursday, November 8, 2018 8:30AM - 8:45AM |
NR3.00003: Ion-neutral momentum transfer efficiency in ionic wind devices. Nicolas Monrolin, Olivier Praud, Franck Plouraboue The ion-neutral momentum transfer occuring in an ionic wind device is investigated. By measuring the airflow velocity using Particle Image Velocimetry (PIV), the local force and so the ion flux, including the pressure gradient is retrieved. By considering various electrodes configurations, our investigation brings out the physical origin of previously obtained optimal configurations, associated with a better trade-off between ion-neutral forcing, viscous friction occurring at the collector(s), and aerodynmic wake interactions. Comparing the net electro-hydrodynamic (EHD) thrust to previous mesurements with digital scales, it is shown that the contribution of velocity fluctuations in the wake of the collecting electrode(s) must be taken into account to recover the net thrust from airflow measurements. By using the charge conservation properties in the drift region of the corona discharge, a general theoretical derivation of the EHD forcing is derived, based on the current/mobility ratio and the electrode geometry. Finally an estimation of the averaged charge carrier mobility based on PIV measurements is developped. [Preview Abstract] |
Thursday, November 8, 2018 8:45AM - 9:00AM |
NR3.00004: Numerical analysis of surface dielectric-barrier-discharge and gas heating effect for application of aerodynamics Shintaro Sato, Masayuki Takahashi, Naofumi Ohnishi Active flow control techniques using dielectric-barrier-discharge (DBD) have been studied by many researchers as DBD plasma actuators. We have conducted three-dimensional fluid-discharge coupling simulation in this study in order to investigate the discharge process and the induced flow field in the nanosecond-pulse-driven DBD plasma actuator. The similar current waveform was obtained between the two- and three-dimensional simulations; however, the discharge has non-uniform structure in span-wise direction as observed in previous experimental study. A filamentary discharge, which has branching streamers, is obtained in the positive-going phase of the applied pulse. In the negative-going phase, the discharge process depends on the dielectric-surface charge deposited during the positive-going phase. The spherical shock waves generated from small cusps of the exposed electrode are reproduced, indicating that this complex pattern imposes the three-dimensional perturbation on the ambient flow. We are going to discuss the gas heating process by considering the detailed process of the energy transfer into the translational energy of the neutral particles and the effect on the flow control performance. [Preview Abstract] |
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