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Cars Coherent Anti Stokes Raman Scattering Spectroscopy Of The Reaction Zone Of Methane Nitrous Oxide And Rdx Propellant Flames
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Book Synopsis CARS (Coherent Anti-Stokes Raman Scattering) Spectroscopy of the Reaction Zone of Methane-Nitrous Oxide and RDX Propellant Flames by : L. E. Harris
Download or read book CARS (Coherent Anti-Stokes Raman Scattering) Spectroscopy of the Reaction Zone of Methane-Nitrous Oxide and RDX Propellant Flames written by L. E. Harris and published by . This book was released on 1986 with total page 54 pages. Available in PDF, EPUB and Kindle. Book excerpt: CARS spectra were obtained for a phi = 3.2 CH4/N20 model and nitramine propellant flames throughout the reaction and post-flame zones in order to assess kinetic mechanisms occurring in these flames. The reaction zone of the rich CH4/N20 flame was studied primarily to provide a stationary flame analog to the transient propellant flame. In the CH4/N20 flame, the decay of the initial products was observed through the Q-branch of the nu 1 and nu 3 modes of N20 and the Q, O and S branches of nu 2 and 2 nu 2 modes of CH4. The formation of the products N2, H2 Q(v' = 0 and v' = 1) and S(5) - S(9), and CO2 were also observed. Temperatures were obtained from both the H2 and N2 Q-branches. In the nitramine propellant flame, the upper bound of the gas-surface interface temperature was measured as 900 K + or - 100 K from the H2 Q-branch. Near the surface of the propellant, reactant RDX (1599 cm-1 tentatively assigned as asymetric NO2 stretch) and transients HCN (NU1) and NO are observed as moderate concentration (> or = 1%). The final product N2 is observed at low concentration, (approx. 1%), H2 (Q and S beaches) and CO are observed at higher concentration (> or = 10%). RDX and HCN decay within 2 mm of the propellant surface while NO remains constant until 4 mm where it decays with a concommitant rise in N2 concentration and temperature. H2 and CO also increase in temperature and concentration.
Book Synopsis Nonsteady Burning and Combustion Stability of Solid Propellants by : Martin Summerfield
Download or read book Nonsteady Burning and Combustion Stability of Solid Propellants written by Martin Summerfield and published by AIAA. This book was released on 1992 with total page 922 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Scientific and Technical Aerospace Reports by :
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1986 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Cars Spectroscopy of Propellant Flames by :
Download or read book Cars Spectroscopy of Propellant Flames written by and published by . This book was released on 1983 with total page 36 pages. Available in PDF, EPUB and Kindle. Book excerpt: Broadband coherent anti-stokes Raman scattering (CARS) spectra were obtained from both the reaction zone and postflame regions of CH(4)/N(2)O flames. The temperature and concentration profiles obtained from both N(2) and N(2)O flames were used to understand the elementary processes occurring in CH(2) /N(2) flames. In addition, N(2) and CO vibrational spectra were used to obtain concentration and temperature profiles by a least-square fit to model calculations. The results obtained were in accord with thermochemical calculations. In rich CH(4)/N(2)O flame previously unobserved, CARS spectra were obtained from pure rotational H(2) transitions. These H(2) spectra offer further opportunities for studying propellant systems. The characterization of CARS spectroscopy obtained from these studies was used to obtain initial CARS measurements from the reaction zone of nitramine composite propellant flames. These studies are only possible using a coherent, highly spatially, and temporally resolved spectroscopy such as CARS. These qualities of CARS which have been applied to the deflagration of propellants containing the explosive ingredients nitrocellulose and/or RDX can be used to study the decomposition and explosive reactions of other energetic materials in both the gas and solid phases.
Book Synopsis Government Reports Announcements & Index by :
Download or read book Government Reports Announcements & Index written by and published by . This book was released on 1986-05 with total page 1058 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Progress in Astronautics and Aeronautics by :
Download or read book Progress in Astronautics and Aeronautics written by and published by . This book was released on 1963 with total page 924 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Government Reports Annual Index by :
Download or read book Government Reports Annual Index written by and published by . This book was released on 1986 with total page 900 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Cars [coherent Anti-Stokes Raman Spectroscopy] Investigations in Sooting and Turbulent Flames by : Alan C.. Eckbreth
Download or read book Cars [coherent Anti-Stokes Raman Spectroscopy] Investigations in Sooting and Turbulent Flames written by Alan C.. Eckbreth and published by . This book was released on 1979 with total page 67 pages. Available in PDF, EPUB and Kindle. Book excerpt: Coherent anti-Stoke Raman spectroscopy (CARS) investigations in sooting, laminar and turbulent, propane-fueled diffusion flames are reported. For a 5320 A pump wavelength, using a frequency-doubled neodymium laser, interferences can occur at very high soot densities. For N2 CARS, there are both incoherent and coherent components to the interference. The incoherent interference arises primarily from anti-Stokes fluorescence from C2 excited by Stokes laser absorption. The C2 is created by the laser vaporization of soot particulates, shown to occur even on a nanosecond time scale. The coherent interference arises most probably from electronically-resonantly enhanced wave mixing in the C2. Fortunately, neither interference is very large. By proper experimental design, interference-free CARS spectra from flame N2 can be obtained even at high soot densities. CARS signatures from N2 have been employed to map the temperature field with high spatial precision throughout a small, luminous, highly sooting, laminar propane diffusion flame. Single pulse (approx, 10 nanosecond) CARS thermometry has been demonstrated in various regions of a highly swireld, turbuelnt propane diffusion flame. Based upon these investigations, CARS continues to appear very promising for diagnostic applications to practical combustion sources. (Author).
Book Synopsis Government Reports Annual Index: Keyword A-L by :
Download or read book Government Reports Annual Index: Keyword A-L written by and published by . This book was released on 1986 with total page 1164 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Coherent Raman Spectroscopy: Applications And New Developments - Proceedings Of The Xi European Cars Workshop by : F Castellucci
Download or read book Coherent Raman Spectroscopy: Applications And New Developments - Proceedings Of The Xi European Cars Workshop written by F Castellucci and published by World Scientific. This book was released on 1993-02-09 with total page 281 pages. Available in PDF, EPUB and Kindle. Book excerpt: The meeting was a forum on the 'state of the art' of the fundamental aspects and the applications of Coherent Antistokes Raman Scattering (CARS) and related nonlinear optic techniques.This volume contains the works of outstanding scientists from the most distinguished research centers of universities, public and private institutions in Europe and other countries, who work on the theory and application of nonlinear laser spectroscopic techniques to the study of gas combustion kinetics, noninterfering flame temperature measurements, high temperature reactors, plasmas and the exciton and vibrational dynamics in condensed phases.
Book Synopsis Coherent Anti-Stokes Raman Spectroscopy (CARS) Project Report for EMR by :
Download or read book Coherent Anti-Stokes Raman Spectroscopy (CARS) Project Report for EMR written by and published by . This book was released on 1992 with total page 17 pages. Available in PDF, EPUB and Kindle. Book excerpt: A specialized software package for generating the theoretical spectra and for analyzing the experimental spectra collected from Coherent Anti-Stokes Raman Spectroscopy (CARS) was developed for a DEC VAX-11 computer using the Fortran language. In 1991, the VAX versions of the software were transported to a personal computer (PC) environment and a number of modifications had to be made. This report describes the various tasks performed to upgrade the PC versions of CARS software to detect the presence of nitric oxide in flames and to address several other concerns associated with the CARS spectral analysis.
Book Synopsis Coherent Anti-Stokes Raman Scattering (CARS) Detection Or Hot Atom Reaction Product Internal Energy Distributions by :
Download or read book Coherent Anti-Stokes Raman Scattering (CARS) Detection Or Hot Atom Reaction Product Internal Energy Distributions written by and published by . This book was released on 1983 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Coherent anti-Stokes Raman spectroscopy (CARS) is being utilized to investigate the rovibrational energy distributions produced by reactive and nonreactive collisions of translationally hot atoms with simple molecules. Translationally hot H atoms are produced by ArF laser photolysis of HBr. Using CARS we have monitored, in a state-specific and time-resolved manner, rotational excitation of HBr (v = 0), vibrational excitation of HBr and H2, rovibrational excitation of H2 produced by the reaction H + HBr .-->. H2 + Br, and Br atom production by photolysis of HBr.
Book Synopsis Raman and Fluorescence Spectroscopy in a Methane-Nitrous Oxide Laminar Flame by : J. A. Vanderhoff
Download or read book Raman and Fluorescence Spectroscopy in a Methane-Nitrous Oxide Laminar Flame written by J. A. Vanderhoff and published by . This book was released on 1984 with total page 41 pages. Available in PDF, EPUB and Kindle. Book excerpt: Using the prism selected lines of argon and krypton lasers temperature and concentration profiles through the reaction zone of a premixed laminar methane-nitrous oxide flame have been obtained from the Raman signals for N(2), H(2)O and CH(4). Fluorescence signals from HN, OH, CN and NCO have also been observed. These signals have been assigned to specific pumping transitions where possible and also converted to relative concentration profiles. Estimates of the absolute concentrations are also determined. Loss rates for these radical species were obtained by assuming overall first-order kinetics. The experimentally determined temperatures and species concentrations are compared with thermochemical equilibrium calculations.
Book Synopsis Coherent Anti-Stokes Raman Spectroscopy (CARS) by :
Download or read book Coherent Anti-Stokes Raman Spectroscopy (CARS) written by and published by . This book was released on 1993 with total page 33 pages. Available in PDF, EPUB and Kindle. Book excerpt: Coherent Anti-Stokes Raman Spectroscopy (CARS) has been accepted as a very useful tool in combustion diagnostics. CARS is an optical technique in which two powerful laser beams are brought to a focus over a very small region in a medium usually a flame. This produces an output laser-like beam arising from a specific interaction of the laser radiation with the molecules of the gases in the flame and the spectral characteristics of this beam contains information about the temperature and species present in the focal volume. The relevant information from the CARS spectra can be extracted only by comparing it with theoretically calculated spectra. A complex software package was developed for generating the theoretical CARS spectra and for analyzing the experimental spectra. This report describes the tasks undertaken to enhance the capabilities of the existing CARS software package with the aim of detecting species such as NO and O2.
Book Synopsis Simultaneous Temperature Measurements with Raman and CARS (Coherent Antistokes Raman Scattering) in Laminar Flames by : W. Stricker
Download or read book Simultaneous Temperature Measurements with Raman and CARS (Coherent Antistokes Raman Scattering) in Laminar Flames written by W. Stricker and published by . This book was released on 1986 with total page 11 pages. Available in PDF, EPUB and Kindle. Book excerpt: Spatially resolved temperature measurements in laminar premixed flames were made using Coherent Antistokes Raman Scattering (CARS) and spontaneous Raman spectroscopy. In the case of narrowband (scanning) CARS, the experimental arrangement allows the performance of simultaneous temperature measurements with both techniques. For broadband (multiplex) CARS the measurements have to be made successively. Three different Raman linewidth models were used for CARS data evaluation. The results were compared with the independently recorded rotational Raman temperatures. Temperature differences up to 10% were observed, depending on the linewidth model used. For two, more complicated line-width models the CARS and Raman temperatures are in good agreement.
Book Synopsis Single-Beam Coherent Anti-Stokes Raman Scattering Spectroscopy of N2 Using a Shaped 7 Fs Laser Pulse by :
Download or read book Single-Beam Coherent Anti-Stokes Raman Scattering Spectroscopy of N2 Using a Shaped 7 Fs Laser Pulse written by and published by . This book was released on 2009 with total page 4 pages. Available in PDF, EPUB and Kindle. Book excerpt: The feasibility is explored by single-beam coherent anti-Stokes Raman scattering CARS spectroscopy of gas-phase diatomic molecules related to combusting flows, with implications for gas-phase thermometry. We demonstrate CARS of gas-phase N2 using a shaped 7 fs laser pulse, investigate the dependence of the CARS signal on the total pressure of the probed environment, both in pure N2 and in mixtures with Ar, discuss the observed signal-to-noise ratio, and suggest improvements to be considered for reliable single-shot measurements at flame temperatures.
Book Synopsis Coherent Anti-Stokes Raman Spectroscopy (CARS) Measurements in a Laminar Flame Coal Combustor by : Robert D. Hancock
Download or read book Coherent Anti-Stokes Raman Spectroscopy (CARS) Measurements in a Laminar Flame Coal Combustor written by Robert D. Hancock and published by . This book was released on 1989 with total page 336 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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