Download or read book Advanced Chemical Laser Nozzle Concepts written by J. C. Hyde and published by . This book was released on 1975 with total page 188 pages. Available in PDF, EPUB and Kindle. Book excerpt: The purpose of this program was to investigate experimentally the performance characteristics of high-pressure recovery, high-performance, advanced nozzle concepts for supersonic chemical lasers. Tests were conducted at small-scale (1 by 3 inches) sizes using scanning mirrors and a high-spatial-resolution IR spectrometer to examine performance. A small water-cooled pitot probe was used to scan the flowfield at the cavity exit to measure potential pressure recovery. A large-scale version of one of the nozzle configurations was designed and fabricated during this program and tested at the Mesa facility by the Aerospace Corporation. The Mesa results provided size scaling data for projecting Laser Engineering Test Facilities (LETF) results to larger sizes. Screening tests were performed on an advanced nozzle concept which provides increased mixing rates, larger throat dimensions, and decreased fabrication time and cost. The results of the screening tests indicated that the nozzles performed as predicted.

Download or read book Chemical Laser Advanced Nozzle Development written by R. A. Dickerson and published by . This book was released on 1976 with total page 148 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report describes experimental and analytical efforts conducted to develop a new chemical laser nozzle concept, the tri-stream (or three-stream) chemical laser nozzle. This nozzle expands the cavity fuel and the fluorine atom (combustor effluent) flows through the same nozzle. The fluorine and cavity fuel streams are separated by a layer of diluent flow to inhibit intermixing and reaction of the fluorine atom and cavity fuel in the nozzle. These three streams (fluorine atom, diluent, and cavity fuel) form a basic unit, or element, of the device, and the number of elements per unit length of nozzle is the most important parameter affecting the achievable performance. Tri-stream nozzles were designed, fabricated, and tested in 2.5-inch-long by 0.4-inch-high nozzle exit configurations. Laser power tests of the tri-stream nozzles were conducted in a free-jet test facility capable of pumping to cavity pressures as low as 2.5 torr. The maximum specific power achieved with DF* lasing using all helium diluent was slightly in excess of 80 kJ/lb. The maximum DF* specific power achieved with N2 nozzle diluent was approximately 60 kJ/lb.

Download or read book Advanced Nozzle Concepts for the Chemical Oxygen Iodine Laser COIL written by and published by . This book was released on 2006 with total page 84 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report results from a contract tasking P.N. Lebedev Physical Institute as follows: Iodine lasers offer the possibility of producing high average powers at a wavelength compatible with conventional fiber optic delivery systems, making them attractive for industrial applications. The planned experimental and theoretical investigations are aimed to a great extent for further understanding of physical processes taking place during mixing of gaseous components and laser active medium preparation. The knowledge obtained during this project will be largely of a general physics nature.

Download or read book Advanced Laser Concepts Addendum Production of NF Excited States written by D. J. Miller and published by . This book was released on 1979 with total page 101 pages. Available in PDF, EPUB and Kindle. Book excerpt: Experiments are described which use an exclusively chemical system to generate the necessary reagents and energy transfer partners required for production of the a 1 Delta and b 1 Sigma + electronic excited states of the NF molecule. The purpose is to assess the potential for the development of an electronic transition chemical laser operating on the NF transitions at wavelengths of 874 nm or 529 nm. In the first of these experiments, staged combustion in a laser cavity is employed by adding a second mixer downstream from the cavity mixer in a conventional, supersonic, diffusion mixing HF chemical laser. This allows for the mixing of F-atoms, H2, and N2F4 the starting reagents required in the NF system. The second set of experiments utilized a tristream HF chemical laser nozzle which allows the three reagents F-atoms, H2, and N2F4 to be mixed in the throat of a supersonic slit nozzle. In both sets of experiments, thermal dissociation of N2F4 was the limitation for the final concentration of NF excited states. In both experiments the quenching of NF excited states is slow.

Download or read book Investigation of Fine Scale Three Dimensional Chemical Laser Nozzles Final Report on Research Work on Advanced Chemical Laser Nozzles written by A. I. Chalfant and published by . This book was released on 1976 with total page 141 pages. Available in PDF, EPUB and Kindle. Book excerpt: An investigation of fine-scale three-dimensional chemical laser (HF/DF) nozzles was carried out. Under Task I three fine-scale cold reaction nozzles having different aerodynamic features were designed. Under Task II the 1-in. x 8-in. cold reaction nozzle fabricated in Task I was tested. The three fine-scale cold reaction segments fabricated in Task I were tested in Task III. A 1-in. segment of the fine scale chain reaction nozzle was also tested in Task III. Under Task IV theoretical analyses were carried out on the vibrational population distribution in the chain reaction nozzle and on the effect of alternative reactants on the performance of the cold reaction nozzle. Under Task V additional extensive tests of the 1-in. x 8-in. cold reaction nozzle were carried out to obtain a better correlation of the performance of this nozzle. Under Tasks VI and VII variable geometry cavity and diffuser walls with and without boundary layer injection were designed, fabricated and assembled.

Download or read book ERDA Research Abstracts written by United States. Energy Research and Development Administration and published by . This book was released on 1976 with total page 716 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1988 with total page 712 pages. Available in PDF, EPUB and Kindle. Book excerpt: Lists citations with abstracts for aerospace related reports obtained from world wide sources and announces documents that have recently been entered into the NASA Scientific and Technical Information Database.

Download or read book Advanced Nozzle Characterization for Hydrogen Fluoride Overtone Chemical Lasers written by William A. Duncan and published by . This book was released on 1992 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book ERDA Energy Research Abstracts written by United States. Energy Research and Development Administration and published by . This book was released on 1976-05 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book ERDA Energy Research Abstracts written by United States. Energy Research and Development Administration. Technical Information Center and published by . This book was released on 1977 with total page 982 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Department of Defense Appropriations for Fiscal Year 1982 Procurement written by United States. Congress. Senate. Committee on Appropriations. Subcommittee on Department of Defense and published by . This book was released on 1981 with total page 808 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Department of Defense Appropriations for Fiscal Year 1982 written by United States. Congress. Senate. Committee on Appropriations. Subcommittee on Department of Defense and published by . This book was released on 1981 with total page 1322 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Government Reports Announcements Index written by and published by . This book was released on 1976-07 with total page 928 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Dept of the Air Force written by United States. Congress. Senate. Committee on Appropriations. Subcommittee on Department of Defense and published by . This book was released on 1972 with total page 1028 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Department of Defense Appropriations for Fiscal Year 1973 Hearings Before 92 2 written by United States. Congress. Senate. Appropriations Committee and published by . This book was released on 1972 with total page 1630 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Hearings written by United States. Congress. House. Committee on Appropriations and published by . This book was released on 1972 with total page 1740 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Department of Defense Appropriations for Fiscal Year 1973 written by United States. Congress. Senate. Committee on Appropriations. Subcommittee on Department of Defense and published by . This book was released on 1972 with total page 1630 pages. Available in PDF, EPUB and Kindle. Book excerpt: