Download or read book Application of Laser Induced Fluorescence LIF to Liquid Propellant Rocket Engine Testing written by C. Brasier and published by . This book was released on 1997 with total page 12 pages. Available in PDF, EPUB and Kindle. Book excerpt: Combustion exhausts present a challenging problem for researchers due to the extremely harsh environment, and nonintrusive diagnostics are often sought to provide flow property information. Laser induced fluorescence (LIF) is one technique in which a chosen flow molecule or marker is probed to yield gross flow properties, such as static temperature and flow velocities. The work presented herein describes the application of LIF to the combustion exhausts of several full-scale liquid-propellant rocket engines spanning a wide range of operational parameters. The method is based upon the use of CW ring-dye lasers which scan in frequency over either the Na D1 or D2 line at 5896 and 5890 A. Na is used as a basis for this approach since it occurs as a trace element in both hydrogen and amine rocket fuels. The generic apparatus is described, including a discussion of the collection and interpretation of the LIF signal to yield radial and temporal profiles of radial flow velocity, static temperature, and fuel distribution. It was found that the LIF technique provides quality data in most cases. Certain stressing situations were also found in which data on the flow properties were not obtainable. Also, computational fluid dynamics (CFD) modeling of the plumes was used to provide baseline estimates of the exhaust flow properties. The model reasonably predicted the gross behavior of the flow as determined by the LIF technique, although some items of fine spatial structure were not reproduced very well.
Download or read book Laser Induced Fluorescence Measurements of OMS and LR91 Amine Rocket Exhausts written by C. Brasier and published by . This book was released on 1997 with total page 17 pages. Available in PDF, EPUB and Kindle. Book excerpt: Nonintrusive diagnostics are often sought to provide information on combustion exhaust flows due to the harsh environment of the flow. Laser-induced fluorescence (LIF) is one technique in which a chosen flow molecule or marker is probed to yield gross flow properties such as static temperature and flow velocities. The work presented herein describes application of LIF to the combustion exhausts of two full-scale liquid-propellant rocket engines, i.e., the Space Shuttle Orbital Maneuvering System (OMS) and the Titan second-stage LR91 rocket engines, as they undergo routine testing in simulated altitude test cells. The method is based upon the use of CW ring-dye lasers which scan in frequency over either the Na D1 or D2 line at 5896 and 5890 L'. Na is used as a basis for this approach since it occurs as a trace element in both hydrogen and amine rocket fuels. The generic apparatus is described, including a discussion of the collection and interpretation of the LIF signal to yield radial and temporal profiles of radial flow velocity and static temperature. CFD modeling of the plumes was used to provide baseline estimates of the exhaust flow properties. It was found that the CFD model does a fairly good job of predicting the gross behavior of the flow, although some items of fine spatial structure are not reproduced well. The OMS and LR91 rocket engine nozzles are drastically different in construction and cooling method. It was found that excellent LIF results were obtained with the radiation-cooled nozzle (OMS), while the fuel-film cooling (FFC) used for the LR91 nozzle generated an optically thick and particle-laden region which severely impeded the determination of static temperature from the Na LIF measurements. Ancillary optical scattering measurements were made on the LR91 which indicated the existence of an annulus of particles in the flow periphery.
Download or read book Development of a Laser Induced Fluorescence System for Application to Rocket Plumes written by and published by . This book was released on 1993 with total page 47 pages. Available in PDF, EPUB and Kindle. Book excerpt: The status of a continuous wave scanning ring-dye laser-induced fluorescence system is presented. This system has been developed for measurements of velocity, temperature, pressure, and specie concentration in high-speed, high-temperature gas flows. Basic principles of laser-induced fluorescence of the sodium atom are discussed. Results of laboratory studies on a sodium vapor cell are presented. Application of this system to three full- scale liquid-propellant rocket engines is discussed, and initial results are presented.
Download or read book Advanced Non intrusive Instrumentation for Propulsion Engines written by North Atlantic Treaty Organization. Advisory Group for Aerospace Research and Development. Propulsion and Energetics Panel. Symposium and published by North Atlantic Treaty Organization Resear Rganization. This book was released on 1998 with total page 554 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book 39th AIAA ASME SAE ASEE Joint Propulsion Conference Exhibit July 20 23 2003 Huntsville Alabama 03 5150 03 5199 written by and published by . This book was released on 2003 with total page 568 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book OH LIF Laser Induced Fluorescence Temperature Measurements in High Pressure Solid Propellant Flames written by J. T. Edwards and published by . This book was released on 1989 with total page 62 pages. Available in PDF, EPUB and Kindle. Book excerpt: An attempt to apply Hydroxyl radical laser induced fluorescence temperature measurements to high pressure solid propellant flames is described. The requirement for broadband spectral collection is discussed. In high pressure propellant flames of AP, HMX, and AN, the broadband detection decreased the light rejection of the system to the point that scattered laser light overwhelmed the OH LIF signal and rendered the measurement unsuccessful. Earlier CN and OH LIF experiments using narrowband data collection were successful, allowing radical profiles to be obtained. The difference between the two sets of experiments illustrate the need for high light rejection efficiencies in any laser-diagnostic measurement in the highly scattering environment of a propellant flame. Keywords: Solid rocket propellants, Combustion spectroscopy, Combustion diagnostics. (aw).
Download or read book AGARD Index of Publications written by North Atlantic Treaty Organization. Advisory Group for Aerospace Research and Development and published by . This book was released on 1995 with total page 614 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book 28th Plasmadynamics and Lasers Conference written by and published by . This book was released on 1997 with total page 624 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Strategies for Planar Laser induced Fluorescence Thermometry in Shock Tube Flows written by Ji Hyung Yoo and published by Stanford University. This book was released on 2011 with total page 151 pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis was motivated by the need to better understand the temperature distribution in shock tube flows, especially in the near-wall flow regions. Two main ideas in planar laser-induced fluorescence (PLIF) diagnostics are explored in this thesis. The first topic is the development of a single-shot PLIF diagnostic technique for quantitative temperature distribution measurement in shock tube flow fields. PLIF is a non-intrusive, laser-based diagnostic technique capable of instantaneously imaging key flow features, such as temperature, pressure, density, and species concentration, by measuring fluorescence signal intensity from laser-excited tracer species. This study performed a comprehensive comparison of florescence tracers and excitation wavelengths to determine the optimal combination for PLIF imaging in shock tube flow applications. Excitation of toluene at 248nm wavelength was determined to be the optimal strategy due to the resulting high temperature sensitivity and fluorescence signal level, compared to other ketone and aromatic tracers at other excitation wavelengths. Sub-atmospheric toluene fluorescence yield data was measured to augment the existing photophysical data necessary for this diagnostic technique. In addition, a new imaging test section was built to allow PLIF imaging in all regions of the shock tube test section, including immediately adjacent to the side and end walls. The signal-to-noise (SNR) and spatial resolution of the PLIF images were optimized using statistical analysis. Temperature field measurements were made with the PLIF diagnostic technique across normal incident and reflected shocks in the shock tube core flow. The resulting images show uniform spatial distribution, and good agreement with conditions calculated from the normal shock jump equations. Temperature measurement uncertainty is about 3.6% at 800K. The diagnostic was also applied to image flow over a wedge. The resulting images capture all the flow features predicted by numerical simulations. The second topic is the development of a quantitative near-wall diagnostic using tracer-based PLIF imaging. Side wall thermal boundary layers and end wall thermal layers are imaged to study the temperature distribution present under constant pressure conditions. The diagnostic technique validated in the shock tube core flow region was further optimized to improve near-wall image quality. The optimization process considered various wall materials, laser sheet orientations, camera collection angles, and optical components to find the configuration that provides the best images. The resulting images have increased resolution (15[Mu]m) and are able to resolve very thin non-uniform near-wall temperature layers (down to 60[Mu]m from the surface). The temperature field and thickness measurements of near-wall shock tube flows under various shock conditions and test gases showed good agreement with boundary layer theory. To conclude this thesis, new applications and future improvements to the developed PLIF diagnostic technique are discussed. These suggested refinements can provide an even more robust and versatile PLIF imaging technique capable of measuring a wider range of flow conditions near walls.
Download or read book Applied Mechanics Reviews written by and published by . This book was released on 1993 with total page 528 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book 32nd AIAA ASME SAE ASEE Joint Propulsion Conference Exhibit written by and published by . This book was released on 1996 with total page 578 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Development of a Laser Induced Fluorescence LIF Method to Visualize the Gasoline Distribution in a Sl Engine written by Thomas A. Heinze and published by . This book was released on 1992 with total page 6 pages. Available in PDF, EPUB and Kindle. Book excerpt: Laser Induced Fluorescence (LIF) is used for planar imaging in a Sl engine. The gasoline was seeded with three different dopants: biacetyl, benzaldehyd, and tetramethyl-p-phenylene diamine (TMPD). Specific problems related to the application of LIF measurements in automative engines are discussed. The non-toxic biacetyl has important advantages. In contrast to TMPD and benzaldehyd it has good vaporization properties and its fluorescence is nearly insensitive to oxygen quenching. Therefore it can also be used in fire SI engines. The linearity investigations indicate the quantitative concentration measurements can be obtained. (Author).
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1994 with total page 364 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Demonstration of the Feasibility of Laser Induced Fluorescence for Arc Jet Flow Diagnostics written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-07 with total page 34 pages. Available in PDF, EPUB and Kindle. Book excerpt: Laser Induced Fluorescence (LIF) studies are carried out on nitric oxide and oxygen molecules in the arc jet flows at the NASA Johnson Space Center Reentry Testing Facility. Measurements are taken in the free stream and from a blunt body shock layer. Tests are performed under different flow conditions to determine the feasibility and sensitivity of the LIF technique for various species. This is developed as a part of high enthalpy flow diagnostics and will be useful to elucidate the rotational and vibrational temperatures. Adequate sensitivity for the detection of O(2) and NO is demonstrated. Proposed improvements of the existing system are presented. Arepalli, Sivaram Unspecified Center NAS9-17900...
Download or read book Laser Probes of Propellant Combustion Chemistry written by D. R. Crosley and published by . This book was released on 1984 with total page 201 pages. Available in PDF, EPUB and Kindle. Book excerpt: Laser-induced fluorescence (LIF) can be used to measure the atomic, diatomic, and triatomic free radicals that are the intermediates in combustion chemistry. Coupled with detailed models, which incorporate a sound and consistent set of reaction rate constants, such measurements can lead to an understanding of that chemistry, having predictive value for use under experimentally difficult conditions. This report describes the development of LIF techniques, the applications of such techniques of flames and to laser pyrolysis/laser fluorescence kinetics experiments, studies of rate constant estimations and detailed modeling of combustion chemistry. The chemistry studied is that of combusting mixtures of CH4/N2O, CH2O/N2O, CH2O/NO2, and related compounds. These contain the chemical networks, individual reactions, and radical species present in the gas-phase combustion of nitramine propellants, such as HMX and RDX. The tasks described are LIF diagnostic studies on O, N, OH, NCO, and NH2 in flow systems and flames, rate constant estimation studies for unimolecular decomposition of CH2O and several hydrocarbons, modelling of the CH2O/N2O flame, and laser pyrolysis/laser fluorescence studies of CH4/N2O and CH2O/N2O chemistry.
Download or read book Development of a Laser induced Fluorescence System for Application to Rocket Plumes written by C. W. Brasier and published by . This book was released on 1993 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Liquid propellant Rocket Engine Testing and Analysis Capabilities written by E. K. Tucker and published by . This book was released on 1993 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
