Last edited by Mikaran
Friday, July 31, 2020 | History

2 edition of Electric discharge stabilization by a highly turbulent flow found in the catalog.

Electric discharge stabilization by a highly turbulent flow

by Robert Edward Nelson

  • 261 Want to read
  • 28 Currently reading

Published by Naval Postgraduate School in Monterey, California .
Written in English

    Subjects:
  • Aeronautics

  • ID Numbers
    Open LibraryOL25397131M

    Objective Type Questions on Fluid Mechanics - Set 19 Set - 1. A large Reynold number is indication of (A) Smooth and streamline flow (B) Laminar flow (C) Steady flow (D) Highly turbulent flow. Quiz Chemical MCQ Civil Dictionary Civil Interview Civil MCQ Civil Quiz E-Book Electrical Interview Electrical Lab Electrical MCQ Electrical.   Electrical and mechanical characteristics of surface AC dielectric barrier discharge plasma actuators applied to airflow control 5 November | Experiments in Fluids, Vol. 55, No. 11 Numerical investigation of tandem-cylinder noise reduction using plasma-based flow Cited by:

      The smoothness of the arc root movement and the voltage fluctuation is definitely affected by the turbulent nature of gas flow and breaking of turbulent eddies. The turbulent eddy interactions cause disturbance of the arc discharge analogous to disturbance of premixed flames as can be seen in figure Author: J Ananthanarasimhan, R Lakshminarayana, M S Anand, S Dasappa.   Large-eddy simulation and acoustic analysis of a turbulent flow field in a swirl-stabilized combustor 12 October | Journal of Mechanical Science and Technology, Vol. 25, No. 10 Laminar premixed V-shaped flame response to velocity and equivalence ratio perturbations: Investigation on kinematic response of flameCited by:

    On viewing the tube by the light of an electric spark, the mass of water resolved itself into a mass of more or less distinct curls, showing eddies [Figure \(\PageIndex{7}\)C] - (Reynolds, , p. ) Figure \(\PageIndex{7}\): The results of Reynolds’ experiments on the transition from laminar to turbulent flow in a circular tube. Cavitation is a phenomenon in which rapid changes of pressure in a liquid lead to the formation of small vapor-filled cavities, in places where the pressure is relatively low. When subjected to higher pressure, these cavities, called "bubbles" or "voids", collapse and .


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Electric discharge stabilization by a highly turbulent flow by Robert Edward Nelson Download PDF EPUB FB2

Theglowdischarge,becomesunstable,currentfluctuateswildly,and arcs form eliminating the glow critical point is a function ofthe electrode materialandgeometry, the gascomposition.

We have investigated the stabilization mechanism of turbulent flame by a filamentary plasma discharge. The results confirm that a turbulent jet flame can be sustained by a pin-to-pin discharge. The plasma-flame structure was visualized using the laser-based by: 1. increasing voltage and frequency of AC electric field, meaning that the range of stability can be extended by AC discharge.

imilarly, the effects of AC and DC electric fields on the stabilization S characteristics of non-premixed laminar propane-jet flames in a coflow have been investigated experimentally [2]. The random excitation fluid force originates from the turbulent flow both due to the upstream flow turbulence and due to turbulence generated in the tube array, which includes vortex type flow.

The upstream turbulence depends on the situation of the tube array. The flow rate of the central jet is varied from 0 l min −1 to 20 l min −1 to produce a laminar or a turbulent jet flow in the central zone.

Two tungsten needles, which are used as electrodes for the discharge, are located approximately 2 cm above the exit of the central : Chengdong Kong, Zhongshan Li, Marcus Alden, Andreas Ehn.

Flow is termed to be turbulent when its rate exceeds about 1 ms −1; and below this rate, the flow at cathode surfaces is laminar and is therefore insufficient for supporting high current densities. The transition from laminar to turbulent flow occurs at a rate of – ms −1, as a rule; depending particularly on the topography of the cathode surface and solution viscosity [34].Author: Mohammad S.

Hussain. The energy addition due to the electrical discharge is treated as an explicit source term and is held constant while advancing the system of flow equations to the next time step. A two-way coupling ensues—Joule heating modifies the conductivity of the operating gas, which in turn results in an altered electrical field distribution.

It is worth mentioning that no turbulent electrical conductivity. Reactions of ground state oxygen and hydrogen atoms produced by an rf electric discharge were studied in a flow system at pressures of about 1 mm Hg.

Hydroxyl radicals and oxygen atoms are generated in the H +; NO 2 reaction and measurements of the rate of removal of oxygen atoms in this system led to a value for the rate constant k 3 of the rapid reaction.

Aims of an adoption of these TBs are following, prevention of a deformation and a position gap and keeping stabilization of electric discharge.

Moreover, finally there is an aim to improve PM removal ratio more by turbulent-flowing and a speed fall of an exhaust gas with TBs and prolonging electric discharge irradiation time to : Minoru Chuubachi, Takeshi Nagasawa.

An electrical corona discharge at atmospheric pressure in positive point-to-plane configuration creates an electric wind from the point to. discharge is highlighted by the time-averaged modification of the reattachment point and by the effects obtained on the turbulent dynamics of the reattached shear layer.

Out of the diˆ erent ˜ ow measurement methods available, the salt dilution method is highly accurate for measurement under turbulent ˜ ow conditions. Not well known in South Africa, the main purpose of this article is to introduce the technique at.

Near-Surface Electrical Discharge in Supersonic Airflow: Properties and Flow Control Article in Journal of Propulsion and Power 24(6) November with 73. Correlation of measured free flight base pressure data for M equals 4 to M equals 19 in laminar and turbulent flow.

Electric arc stabilization in crossed convective and magnetic fields. Some characteristics of an electric discharge in a supersonic gas stream. The simulation results show that a highly turbulent vortex flow can be generated at the bottom of the RGA reactor to accelerate the arc rotation after.

A flow's transition from laminar to turbulent leads to increased levels of skin friction. In recent years, dielectric barrier discharge actuators have been shown to be able to delay the onset of turbulence in boundary by: Radiofrequency plasma stabilization of a low-Reynolds-number channel flow Article in Journal of Fluid Mechanics (2) June with 34 Reads How we measure 'reads'.

Reverse-vortex flow stabilization is a known method for gaseous flame and plasma stabilization [1,21,22], and it has been practically implemented in a GA reactor, for gas conversion applications [].As shown in Fig. 1(a), such a reactor is essentially composed of a tubular vessel (at cathode potential) with tangential inlets.

As shown in the figure, this forms a forward vortex flow. ACKNOWLEDGEMENT The work Group wishes to express their appreciation to the secreterial staff of the Compliance Branch, Enforcement Division, Office of Water Enforcement, for the assistance provided in the preparation of this Manual, especially Mrs.

Bennie M. Yeargin, Mr. Kenneth B. Goggin and Ms. Jacqueline A. Price. Abstract. An original aerodynamic technique was developed for achieving uniform axial dc-discharges in CO 2 gas mixtures Basic investigations of the discharge characteristics were conducted In open-gas cycle through measurements of both thermodynamic and electric properties of the discharge and of the small-signal gain coefficient at μm.

Uniform and Cited by: 1. With a Reynolds number of the laminar flow passes to a turbulent flow. Laminar flow turbulent flow Example: In one second, 2 litres of acetic acid passes through a pipe with a nominal bore of 50 mm. The acetic acid has a kinematic viscosity of η = mPa s = Pa s and a density of kg/dm ≈.

WENO interpolation for Lagrangian particles in highly compressible flow regimes Journal of Computational Physics, Vol. Highly-resolved large-eddy simulations of combustion stabilization in a scramjet engine model with cavity flameholderCited by:   The objective of these experiments was to determine the optimal forcing location and unsteady forcing actuation produced by a single dielectric barrier discharge plasma actuator for controlling the flow downstream of a backward-facing step.

The investigated configuration is a mm-height step mounted in a closed-loop wind tunnel. The flow velocity is fixed at 15 m/s, Cited by: