Experimental Investigation of Liquid Fuel Vaporization and Mixing in Steam and Air PDF Download
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Author: Andrew Campbell Lee
Publisher:
ISBN:
Category : Injectors
Languages : en
Pages : 324
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Author: Andrew Campbell Lee
Publisher:
ISBN:
Category : Injectors
Languages : en
Pages : 324
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Author: G. B. Petrazhitskiĭ
Publisher:
ISBN:
Category : Atomization
Languages : en
Pages : 28
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Author:
Publisher:
ISBN:
Category :
Languages : en
Pages :
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The initial set of experiments have been performed in the test stand with the basic configuration described in the last progress report. With this experimental set-up, the temperature measurements on the firing tube (and oil evaporation surface) indicated insufficient and a much too low heating rate with the preheat nozzle (0.75 gph). A number of remedies were attempted to increase the gas temperature in the recirculation region around the firing tube. These remedies were intended to increase the flame angle and consisted of various size discs, washers and flame impellers located relative to the nozzle. A qualitative picture of the flow flame-configuration pattern is also shown. These were not successful in increasing the evaporization surface temperature. Moreover sooting was enhanced. To significantly reduce the heat-up time with the preheat nozzle, the contribution from the various heating modes are assessed here. An element of the firing tube and evaporation surface is shown. The various heat transfer modes to this surface with and without vaporization spray are indicated.
Author:
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ISBN:
Category :
Languages : en
Pages :
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A summary of the progress achieved under the above referenced contract during the third quarter is reported here. After instituting a number of modifications, a suitable preheat flame which could provide the desired vaporization surface temperature to within an acceptable heat-up time (approx. 30 secs) was finally attained. Successful switchover to a stable vaporized and pre-mixed blue oil flame was also obtained. Preliminary data with this blue flame are presented along with vaporization surface temperature history. Adaptation of this configuration to the boiler was also initiated during this quarter so that thermal efficiency and other measurements could be conducted to assess the relative merits of oil vaporization over the spray combustion flame. Some peripheral problems identified during this experimental phase still need to be resolved during the adaptation. The details of the above results and some preliminary data obtained in the thermal efficiency set-up with the preheat flame alone are presented in the body of this report.
Author:
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 652
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Book Description
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.
Author: A. A. Putnam
Publisher:
ISBN:
Category : Atomization
Languages : en
Pages : 1584
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Author: James Arthur Drallmeier
Publisher:
ISBN:
Category :
Languages : en
Pages : 276
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An experimental study of an infrared laser extinction technique for measuring fuel vapor flux in evaporating liquid fuel sprays was conducted. The infrared laser extinction technique consists of three separate measurements: a visible light angular scattering measurement, a visible light line-of-sight extinction measurement and an infrared line-of-sight extinction measurement. Using this technique, vapor flux along with other spray parameters such as mean drop size and size distribution were measured for a pressure atomized, isooctane fuel spray. Line-of-sight infrared extinction measurements were deconvoluted to obtain radial variations of vapor concentration. Peak vapor concentrations were measured at the spray center due to air entrainment effects. Based on the radial mass fraction and measured gas phase velocity profiles, the fuel vapor mass flux was calculated; most of the vapor flux was contained in the center of the spray at all axial locations. The fuel vapor mass flux was integrated over the spray area at each axial location to obtain fuel vapor mass flow rates. Comparisons were made between the infrared laser extinction technique and a Phase/Doppler Particle Analyzer (P/DPA) in terms of several spray parameters including drop size, size distribution and, in particular, vapor flux. Size comparisons were conducted on a spatially resolved and line-of-sight basis. While the spatially resolved comparisons indicated similar trends, the angular scattering measurements consistently predicted Sauter mean diameter results $sim$10 $mu$m larger than those obtained from the P/DPA. Comparisons of measured total fuel vapor flow yielded differences of 7 to 40% between the P/DPA and infrared extinction technique. A detailed error analysis was performed to determine the error sensitivities of the vapor concentration to the measured parameters as a function of spray radius. The vapor concentration was relatively insensitive to the measured drop size distribution due to the fact that the vapor absorption was the most dominant mode of extinction. The vapor concentration was most sensitive to the measurement of the infrared extinction ratio. An upper limit for the overall error in the vapor concentration measurement was estimated at 15% over the spray radius.
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 70
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Experiments with hydrogen-air-steam mixtures, such as those found within a containment system following a reactor accident, were conducted in the Heated Detonation Tube (43 cm diameter and 12 m long) to determine the region of benign combustion; i.e., the region between the flammability limits and the deflagration-to-detonation transition limits. Obstacles were used to accelerate the flame; these include 30% blockage ratio annular rings, and alternate rings and disks of 60% blockage ratio. The initial conditions were 110 °C and one or three atmospheres pressure. A benign burning region exists for rich mixtures, but is generally smaller than for lean mixtures. Effects of the different obstacles and of the different pressures are discussed.
Author: Guangxi Yue
Publisher: Springer Science & Business Media
ISBN: 3642026826
Category : Science
Languages : en
Pages : 1186
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The proceedings of the 20th International Conference on Fluidized Bed Combustion (FBC) collect 9 plenary lectures and 175 peer-reviewed technical papers presented in the conference held in Xi'an China in May 18-21,2009. The conference was the 20th conference in a series, covering the latest fundamental research results, as well as the application experience from pilot plants, demonstrations and industrial units regarding to the FBC science and technology. It was co-hosted by Tsinghua University, Southeast University, Zhejiang University, China Electricity Council and Chinese Machinery Industry Federation. A particular feature of the proceedings is the balance between the papers submitted by experts from industry and the papers submitted by academic researchers, aiming to bring academic knowledge to application as well as to define new areas for research. The authors of the proceedings are the most active researchers, technology developers, experienced and representative facility operators and manufacturers. They presented the latest research results, state-of-the-art development and projects, and the useful experience. The proceedings are divided into following sections: • CFB Boiler Technology, Operation and Design • Fundamental Research on Fluidization and Fluidized Combustion • C02 Capture and Chemical Looping • Gasification • Modeling and Simulation on FBC Technology • Environments and Pollutant Control • Sustainable Fuels The proceedings can be served as idea references for researchers, engineers, academia and graduate students, plant operators, boiler manufacturers, component suppliers, and technical managers who work on FBC fundamental research, technology development and industrial application.
Author: Oak Ridge National Laboratory
Publisher:
ISBN:
Category : Fossil fuels
Languages : en
Pages : 656
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Book Description
