Flowfield measurements in a model scramjet combustor using laser-induced iodine fluorescence

Publisher: The Center in Hampton, VA

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  • Jets -- Fluid dynamics.,
  • Fluorescence.

Edition Notes

Statementsubmitted to National Aeronautics and Space Administration, Langley Research Center ; submitted by James C. McDaniel, Jr.
SeriesNASA-CR -- 175399., NASA contractor report -- NASA CR-175399.
ContributionsLangley Research Center., University of Virginia. Dept. of Mechanical and Aerospace Engineering.
The Physical Object
Pagination1 v.
ID Numbers
Open LibraryOL17666183M

James C McDaniel has written: 'Flowfield measurements in a model scramjet combustor using laser-induced iodine fluorescence' -- subject(s): Jets, Fluid dynamics, Fluorescence Load More Trending. The current record is held by NASA's XA scramjet at Mach or almost 7, miles per hour. True, the NASA XA can hit Mach which is about miles per hour. But an Aussie scram jet recently hit Mach 10 (about mph). ILASS – Europe , 23rd Annual Conference on Liquid Atomization and Spray Systems, Brno, Czech Republic, September 1 Fuel Distribution Measurements in a Model Low NOx Double Annular Combustor using Laser Induced Fluorescence R.D. Lockett*and D.A. Greenhalgh†, * School of Engineering & Mathematical Sciences City University London. This banner text can have markup.. web; books; video; audio; software; images; Toggle navigation.

1. Introduction. The very first experiments of laser induced spark emission were performed in the s and involved a laser beam producing a vapour upon irradiation of a solid target and an electrical spark subsequently exciting the ablated plume [].These experiments can be considered as early precursors of Laser Induced Breakdown Spectroscopy (LIBS) and since then LIBS has shown its huge Cited by: Henckels et. al. 2 used infra-red scanning to measure the temperature field around a model in a shock tunnel at Mach with a 5 ms test duration. Cassady and Lieberg 3 performed Planar Laser-Induced Fluorescence Temperature Measurements in a shock tunnel at Mach 9 with a 2 millisecond test time. The effects of the chemical reaction on the supersonic flowfield was investigated using shadowgraphs, broadband flame emission photography, and planar laser-induced fluorescence of OH. The shadowgraphs indicated a strong affect of the heat release on the wave pattern in the combustor, with a significant increase in flowfield unsteadiness. Measurements and modeling of acetone laser-induced fluorescence with implications for temperature-imaging diagnostics Mark C. Thurber, Fre´de´ric Grisch, Brian J. Kirby, Martin Votsmeier, and Ronald K. Hanson Recent determinations of the temperature dependence .

An electronic device is described which generates a delayed pulse, where the delay is increased in a step‐like manner. This device finds application in the measurement of kinetic decays, particularly when laser‐induced fluorescent (LIF) detection of the decaying species is used. The circuit uses 15 low‐power Schottky TTL chips and is contained within a dual width NIM by: 3. (rumble) in the combustor. 2psi - 3psi pressure oscillations in the combustor can cause rumble up to dB in-tensity. This paper reports relative quantitative measurements of the liquid and vapour phase fuel distribution in a high pressure, three-sector low NOx double annular combustor using Planar Laser Induced Fluorescence (PLIF). Atomic clocks use laser induced fluorescence in order to detect excited atoms, how does this work? Apparently the clocks need to detect the states of nearly % of the atoms being examined. In an atomic fountain clock, a gas of Cesium atoms is excited and then a . J. S. Fox, P. M. Danehy, "Validation of a laser-induced fluorescence (LIF) model for mole fraction imaging", Proceedings of The Pacific Rim Conference on Lasers and Electro-Optics, Seoul Korea, The Institute of Electrical and Electronics Engineers, Piscataway, NJ, p. ().

Flowfield measurements in a model scramjet combustor using laser-induced iodine fluorescence Download PDF EPUB FB2

Get this from a library. Flowfield measurements in a model scramjet combustor using laser-induced iodine fluorescence. [James C McDaniel; Langley Research Center.; University of Virginia. Department of Mechanical and Aerospace Engineering.]. is to obtain accurate, spatially-resolved measurements of flowfield variables, including pressure and velocity, in a model nonreacting scramjet combustor flowfield.

The diagnostic technique to be employed is based on laser-induced fluorescence from iodine molecules seeded into the flowfield.

Proposal No. MAE-NASA outlined phase 1 of the research. A preliminary quantitative study of the compressible flowfield in a steady, nonreacting model SCRAMJET combustor using laser-induced iodine fluorescence (LIIF) is reported. Measurements of density, temperature, and velocity were conducted with the calibrated, nonintrusive, optical technique for two different combustor operating conditions.

First, measurements were made in the supersonic flow over a rearward-facing step without Author: J. Mcdaniel and D. Fletcher. Computer-controlled multiparameter flowfield measurements using planar laser-induced iodine fluorescence.

James M. Donohue andCited by: Preliminary designs were completed for an iodine mixing chamber and the optical setup to be used with a modified wind tunnel in obtaining accurate, spatially resolved measurements of variables in the flowfield of a model nonreacting scramjet combustor.

Schematics of the iodine-seeded wind tunnel and a sketch of the charcoal filter for removing the iodine are included along with a cutaway section Author: Jr.

Mcdaniel. Tunable excimer lasers are used to obtain two-dimensional images to study the nonreacting and reacting flow field of a hydrogen-fueled SCRAMJET model Cited by:   A systematic literature review based on different fuel injection strategies used in scramjet combustors 21 August | Heat Transfer-Asian Research, Vol.

48, No. 8 Reynolds-average Navier-Stokes study of steady and pulsed gaseous jets with different periods for the shock-induced combustion ramjet engineCited by:   Laser-induced fluorescence of iodine seed molecules can be used for both flow visualization and accurate measurements of gasdynamic properties.

This paper gives an introductory review of the use of iodine in experimental fluid mechanics, including basic formulas for saturated and non-saturated fluorescence (excited with narrowband or broadband lasers), line shape, line strength Cited by: Gas density and fuel mole fraction in a cavity flameholder of a supersonic combustor with ethylene (C 2 H 4) fueling are simultaneously measured using nanosecond gated (10 ns) laser-induced breakdown spectroscopy (n-LIBS).Emission spectra from the laser-induced plasma over a range ( nm– nm) containing multiple emission lines of O, H, N, and C are captured and used to quantify the gas Cited by: One flow field, for which laser-induced iodine fluorescence data is readily available in Mach 2 flow over a rearward-facing step.

Fig. 3 shows the laser-induced fluorescence from broadband excitation of an iodine seeded flow using an argon ion laser tuned to the nm line. Some spectroscopic data using narrow-band excitation is available both Author: Roy J.

Hartfield. A supersonic combustor was experimentally investigated using both conventional instrumentation and laser-based diagnostics. Planar laser-induced fluorescence (PLIF) imaging of OH was used in the main section of the combustor to examine flameholding and flame propagation during a series of evaluations at conditions simulating Mach by:   Kerosene concentration distributions measured in the combustion chamber of a hotshot wind tunnel in the attached pipeline regime with the input Mach number of are reported.

Kerosene is injected through 12 jet injectors at an angle to the flow from the wall upstream of a cavity. The measurements are performed in three cross sections.

Data on the kerosene concentration Cited by: 2. Complete three-dimensional multiparameter mapping of a supersonic ramp fuel injector flowfield.

Effects of combustion on flowfield in a model scramjet combustor. Symposium (International) on Combustion, Vol. 27, No. 2 Computer-controlled multiparameter flowfield measurements using planar laser-induced iodine by: Experimental investigation of a supersonic swept ramp injector using laser-induced iodine fluorescence.

Roy J. Hartfield Jr., Study of dual-mode flowfield in scramjet by:   An overview is provided of the planar laser-induced fluorescence (PLIF) method, which currently allows simultaneous combustion measurements at more than 10 5 flowfield points. Important advantages of the method include its relatively high signal strength, ease of interpretation, and applicability for determining several flowfield variables (including concentration, temperature, velocity Cited by: A Spectral Analysis of Laser Induced Fluorescence of Diatomic Iodine S.

Bayram Miami University, Physics Department, Oxford, OH chanical model for the diatomic molecule as they use the Experimental setup to record laser-induced uorescence using a green laser diode at nm, an iodine cell, and a spectrometer.

b) The B. At the higher range of the hypersonic regime, close to M which is considered the upper envelope of air-breathing propulsion, the heat addition may amount to only 10% of the incoming airflow enthalpy. The heat-release effects are less by: 4.

This paper describes an experimental program to provide high quality, fuel-air mixing data in a well- characterized scramjet model flowfield for validation of computational tools, such as subgrid. Planar laser-induced iodine fluorescence is used to map out the nonreacting mixing flowfield of an unswept ramp fuel injector using air injected at Mach into a Mach : Konstantinos Kontis.

This, in turn, requires experimental measurements of the important collisional processes at conditions that are similar to those of the intended application.2'3 Laser-Induced Iodine Fluorescence (LIIF) is one example of an LIF technique that has been extensively developed to provide measurements of local thermodynamic properties, as well as Cited by: Single-shot volumetric laser induced fluorescence (VLIF) measurements in turbulent flows seeded with iodine Yue Wu, 1 Wenjiang Xu, Qingchun Lei,2 and Lin Ma1,2,* 1Department of Aerospace and Ocean Engineering, Virginia Tech, Blacksburg, VAUSA 2Department of Mechanical Engineering, Virginia Tech, Blacksburg, VAUSA *[email protected] Abstract: This work reports the.

Laser-induced fluorescence measurements of OH have been performed in an atmospheric stoichiometric CH(4)/air flame and in a highly sooting propane flame. Flowfield measurements in a model scramjet combustor using laser-induced iodine fluorescence [microform] Fluorescence and allied radiations; Photoabsorption and photodissociation of molecules important in the interstellar medium [microform]: an.

The kerosene vapor distribution was visualized using planar laser-induced fluorescence (PLIF) technique in a model scramjet engine combustor in Ma flow with stagnation temperature. Rothstein, A. & Wantuck, P. A study of normal injection of hydrogen into a heated supersonic flow using planar laser-induced fluorescence.

In 28th Joint Propulsion Conference and Exhibit, AIAACited by: This makes laser-induced fluorescence spectrum of molecular iodine especially suitable to study the energy structure of homonuclear diatomic molecules at room temperature.

In this spirit, we present a rather straightforward and inexpensive experimental setup and the associated spectral analysis which provides an excellent exercise of applied.

Nitric oxide planar laser-induced fluorescence measurements have been performed in a small-scale scramjet combustor at the University of Virginia Aerospace Research Laboratory at nominal simulated.

A Laser-Induced Fluorescence Technique for Measurement of Slot-Injected Fluid Concentration Profiles in a Plate Turbulent Boundary Layer [T. Brungart] on. measurements using laser induced fluorescence (LIF) have been carried out by Dimotakis where fluorescein was used to indicate areas in a jet combustion field that have "reacted"- mixed with the ambient, versus areas in the jet that have "not reacted"-not mixed with the ambient.

Bellerose 5 advanced mixing measurements usingCited by:   Laser-induced fluorescence (LIF) is a highly sensitive resonant technique that can readily be employed for studying the distributions of minor species, down to sub-ppm levels, both qualitatively and quantitatively, and for measuring temperature fields and flame front propagation.

A planar laser-induced fluorescence (PLIF) technique is discussed and applied to measurement of time-averaged values of velocity and temperature in an I,-seeded N, hypersonic free jet facility.

Using this technique, a low temperature, non-reacting, hypersonic flow over a simplified model of a reaction control system (RCS) was investigated. Data Cited by:   Nakaya S, Hikichi Y, Nakazawa Y, Sakaki K, Choi M, Tsue M, Kono M, Tomioka S () Ignition and supersonic combustion behavior of liquid ethanol in a scramjet model combustor with cavity flame holder.

Proc Combust Inst 35(2)– CrossRef Google Scholar.Supersonic combustion experiments were performed using three different hydrogen fuel-injection configurations in a cavity-based model scramjet combustor with various global fuel–air equivalence ratios. The configurations tested were angled injection at 15° to the flow direction upstream of the cavity, parallel injection from the front step, and upstream injection from the rear : Eunju Jeong, Sean O’Byrne, In-Seuck Jeung, A.

F. P. Houwing.