Methodology For Measuring Geometrical And
Thermal Characteristics Of Flames In Laboratory
Forest Fires
Author(s)
E. Pastor, A. Àgueda, L. Martin, M. Muñoz, A. León, Y. Pérez
& E. Planas
Abstract
Flame properties from forest fuels are needed for fire behaviour modelling, either
for developing empirical models or for validation purposes. Measuring such
properties is usually a very complex task due to the fluctuation in time and space
and to the ambiguity in the definition of several geometrical variables. Moreover,
there is a lot of subjectivity in most of the methods historically used in fire
laboratories, which should be strongly avoided. In this paper, we present a
standard, objective and automated methodology to determine several geometrical
and thermal properties of laboratory and open stationary fires, based on IR and
visible imagery techniques. We develop several procedures to obtain the mean
flame height based on the concept of flame intermittence, the flame pulse
frequency, the temperatures distribution within the flame and the emissive power
and the radiation flux of the flames.
Keywords: flame geometry, thermal characteristics, IR imagery, stationary fires.
1 Introduction
Understanding flame properties and behavior is an essential issue in predicting
forest fire spread and suppression potential. Both geometrical and thermal flame
characteristics are needed as input variables in different sorts of fire studies.
Flame length and angle are required for radiative heat transfer calculations [1],
crowning potential modeling [2] and suppression difficulty estimations [3].
Keywords
flame geometry, thermal characteristics, IR imagery, stationary fires.
Related Book
Other papers in this volume
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