Open fires and transport of firebrands: second annual report

Sánchez Tarifa, Carlos and Pérez del Notario Martínez de Marañón, Pedro and García Moreno, Francisco and Liñán Martínez, Amable and Bollain Sánchez, Arturo (1963). Open fires and transport of firebrands: second annual report. Monografía (Technical Report). E.T.S.I. Aeronáuticos (UPM), Madrid.

Description

Title: Open fires and transport of firebrands: second annual report
Author/s:
  • Sánchez Tarifa, Carlos
  • Pérez del Notario Martínez de Marañón, Pedro
  • García Moreno, Francisco
  • Liñán Martínez, Amable
  • Bollain Sánchez, Arturo
Item Type: Monograph (Technical Report)
Date: May 1963
Subjects:
Faculty: E.T.S.I. Aeronáuticos (UPM)
Department: Motopropulsión y Termofluidodinámica [hasta 2014]
UPM's Research Group: Principal investigador Carlos Sánchez Tarifa
Creative Commons Licenses: Recognition - No derivative works - Non commercial

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Abstract

During the report period the research, work on open fires has been directed, mainly, to the study of fire burning rates. A theoretical model of the process of the combustion of a liquid fuel contained in a vessel has been developed. This model gives stationary as well as transient burning rates of the fuel and tenperature distributions within the vessel as a function of the amount of heat received through the fuel surface. Dimensionless results are shown as well as several numerical applications for n-heptane, iso-octano, benzene, ethyl-alcohol and dioxane. An extense research program is being carried out in order to verify the theoretical conclusions and in oder to obtain basic information on the conbustion process. The research facilities are, essentially, the same ones described in First Annual Report, although they have boon improved and several radiometers have been installed. Several experimental results are shown as well as a comparison between theoretical and experimental results. Some interesting conclusions are obtained on the Open Fires program which are included at tho end of the Report. Theoretical and experimental studies on the problem of transport of firebrands have shown that an excellent approximation of the process is obtained by assuming that the firebrands fly at their terminal or final velocity of fall. By means of numerical integrations of tho differential equations of the process and by means of analytical calculations it is shown that in a matter of seconds the firebrands reach values of their velocities very close to tho terminal velocity of fall. Therefore, flight paths are calculated, under such assumption, and the experimental tests in the wind tunnel are carried out at wind speeds equal to tho firebrand terminal velocity of fall. This is achieved "by reducing continuously tho wind speed in the tunnel during the test, in order to keep equal the values of the aerodynanic drag and the weight of the particle. This is controlled by the position of the wire holding the firebrand or else by the recorded curves of such weight and drug. An extense research program is also being carried out,with firebrands of several kind of woods (pinus pinaster, picer excelsa, quercus sessiliflora, populus tremuloides and ochrona lagopus) with spherical and cylindrical shapes and for different moisture contents. The small wind tunnel described in First Annual Report is being used. A large wind tunnel has been deaigned and constructed and it will be soon utilized. Several results are shown and discussed, including flight paths of the firebrands for several wind conditions. Some important conclusions are obtained on the transport of firebrands progran which at the end of the report.

More information

Item ID: 2274
DC Identifier: http://oa.upm.es/2274/
OAI Identifier: oai:oa.upm.es:2274
Deposited by: Biblioteca ETSI Aeronauticos
Deposited on: 14 Feb 2010 17:20
Last Modified: 20 Apr 2016 12:01
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