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ISBN:
Category :
Languages : en
Pages : 4
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Book Description
An optical access probe was developed to meet the demands of a gas turbine combustor in a Cooperative Research and Development Agreement (CRADA) with the Westinghouse Science and Technology Center. The probe is water-cooled, has no external fittings, and is pressure-sealed with a conventional compression fitting. The probe utilizes a 1.0-mm diameter sapphire rod as a lightpipe for optical access and fiber optic coupling to the spectroscopic experiments. This is coupled with a fused silica optical fiber to the optical experiments employed to study the combustion process. The probe has been tested to 106 Pa in a test combustor exhibiting 105 Pa instability oscillations. To test its spectral range, the probe investigated OH emissions at 310 nm, C2 and CH emissions from 400 to 500 nm, Near IR emissions from 800 to 1,800 nm, and temperature measurements using an Accufiber detection system.
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 4
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Book Description
An optical access probe was developed to meet the demands of a gas turbine combustor in a Cooperative Research and Development Agreement (CRADA) with the Westinghouse Science and Technology Center. The probe is water-cooled, has no external fittings, and is pressure-sealed with a conventional compression fitting. The probe utilizes a 1.0-mm diameter sapphire rod as a lightpipe for optical access and fiber optic coupling to the spectroscopic experiments. This is coupled with a fused silica optical fiber to the optical experiments employed to study the combustion process. The probe has been tested to 106 Pa in a test combustor exhibiting 105 Pa instability oscillations. To test its spectral range, the probe investigated OH emissions at 310 nm, C2 and CH emissions from 400 to 500 nm, Near IR emissions from 800 to 1,800 nm, and temperature measurements using an Accufiber detection system.
Author: Galen B. King
Publisher:
ISBN:
Category :
Languages : en
Pages : 31
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Book Description
This report describes progress on the development of a new laser based combustion diagnostic method for the quantitative measurement of both major and minor species in high pressure flames. The technique, Asynchronous Optical Sampling (ASOPS), is a state of the art improvement in picosecond pump/probe laser spectroscopy. The ASOPS signal has been observed using a solution of rhodamine B in methanol as the sample. The response of the instrument was shown to be proportional to pump power, probe power, and sample absorptance. Different frequency synthesizers and different modes of triggering were used to study their effect on signal stability. Cavity dumpers and frequency doublers have been added to the instrument to prepare for the measurement of the hydroxyl radical in atmosphere laminar flames.
Author:
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ISBN:
Category :
Languages : en
Pages : 16
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Author: National Aeronautics and Space Administration (NASA)
Publisher: Createspace Independent Publishing Platform
ISBN: 9781721280513
Category :
Languages : en
Pages : 28
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Book Description
This paper documents the design and development of the fiber-optic probes utilized in the flame detection systems used in NASA Langley Research Center's 8-Foot High Temperature Tunnel (8-ft HTT). Two independent flame detection systems are utilized to monitor the presence and stability of the main-burner and pilot-level flames during facility operation. Due to the harsh environment within the combustor, the successful development of a rugged and efficient fiber-optic probe was a critical milestone in the development of these flame detection systems. The final optical probe design for the two flame detection systems resulted from research that was conducted in Langley's 7-in High Temperature Pilot Tunnel (7-in HTT). A detailed description of the manufacturing process behind the optical probes used in the 8-ft HTT is provided in Appendix A of this report. Borg, Stephen E. and Harper, Samuel E. Langley Research Center NASA/TM-2001-211233, L-18121, NAS 1.15:211233
Author: Andreas Braeuer
Publisher: Elsevier
ISBN: 0444634207
Category : Science
Languages : en
Pages : 396
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Book Description
In situ Spectroscopic Techniques at High Pressure provides a comprehensive treatment of in-situ applications of spectroscopic techniques at high pressure and their working principles, allowing the reader to develop a deep understanding of which measurements are accessible with each technique, what their limitations are, and for which application each technique is best suited. Coverage is also given to the instrumental requirements for these applications, with respect to the high pressure instrumentation and the spectroscopic components of the equipment. The pedagogical style of the book is supplemented by the inclusion of "study questions" which aim to make it useful for graduate-level courses. Bridges the gap between supercritical fluid science/technology and in-situ spectroscopic techniques Provides a powerful guide to applying spectroscopic techniques as gainful sensors at high pressure Highlights the influence of a high pressure environment and high pressure equipment on spectroscopic techniques Presents a deep understanding of which measurements are accessible with each technique, what their limitations are, and for which application each technique is best suited
Author: Marshall C. Burrows
Publisher:
ISBN:
Category : Combustion
Languages : en
Pages : 40
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Book Description
Author:
Publisher:
ISBN:
Category : Optics
Languages : en
Pages : 890
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Book Description
Author: Norman Chigier
Publisher: CRC Press
ISBN: 9781560320289
Category : Technology & Engineering
Languages : en
Pages : 556
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Book Description
The book begins with an introduction to the general problems of making measurements in high temperature and a presentation of chemically reacting flow systems. It describes each instrument with the various diagnostic techniques and discusses measurements that have been made in furnaces, flames, and rocket engines. The detailed measurement techniques described in this book cover a wide spectrum of applications in combustion systems, including gas turbine, rocket measurement techniques that were developed in laboratories. Information obtained on detailed temperature, velocity, particle size, and gas concentration distribution is leading to improve understanding of the chemical combustion process and to design imporvements in combustors.
Author: National Aeronautics and Space Adm Nasa
Publisher: Independently Published
ISBN: 9781724000903
Category : Science
Languages : en
Pages : 26
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Book Description
The measurement of the temporal distribution of fuel in gas turbine combustors is important in considering pollution, combustion efficiency and combustor dynamics and acoustics. Much of the previous work in measuring fuel distributions in gas turbine combustors has focused on the spatial aspect of the distribution. The temporal aspect however, has often been overlooked, even though it is just as important. In part, this is due to the challenges of applying real-time diagnostic techniques in a high pressure and high temperature environment. A simple and low-cost instrument that non-intrusively measures the real-time fuel-to-air ratio (FAR) in a gas turbine combustor has been developed. The device uses a dual wavelength laser absorption technique to measure the concentration of most hydrocarbon fuels such as jet fuel, methane, propane, etc. The device can be configured to use fiber optics to measure the local FAR inside a high pressure test rig without the need for windows. Alternatively, the device can readily be used in test rigs that have existing windows without modifications. An initial application of this instrument was to obtain time-resolved measurements of the FAR in the premixer of a lean premixed prevaporized (LPP) combustor at inlet air pressures and temperatures as high as 17 atm at 800 K, with liquid JP-8 as the fuel. Results will be presented that quantitatively show the transient nature of the local FAR inside a LPP gas turbine combustor at actual operating conditions. The high speed (kHz) time resolution of this device, combined with a rugged fiber optic delivery system, should enable the realization of a flight capable active-feedback and control system for the abatement of noise and pollutant emissions in the future. Other applications that require an in-situ and time-resolved measurement of fuel vapor concentrations should also find this device to be of use. Nguyen, Quang-Viet and Mongia, Rajiv K. and Dibble, Robert W. Glenn Research Center NASA/TM
Author:
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 702
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Book Description
