Relationship of Fuel Size and Spacing to Combustion Characteristics of Laboratory Fuel Cribs

Download or read book Relationship of Fuel Size and Spacing to Combustion Characteristics of Laboratory Fuel Cribs written by Hal E. Anderson and published by . This book was released on 1990 with total page 12 pages. Available in PDF, EPUB and Kindle. Book excerpt: Flaming combustion in cribs of large woody fuels, thickness 5 cm or greater, is not sustained when fuel spacing ratio, fuel edge-to-edge separation distance to fuel thickness, is greater than 3:1. The burning rate per unit of exposed fuel surface area was found to reach a maximum near a porosity of 0.21, where porosity is defined as the square root of the ratio of vertical venting area to the exposed large-fuel burning rate was found to drop rapidly when the porosity exceeds 0.3 and the large-fuel spacing ratio increases beyond 2.23:1. This supports the critical spacing assigned in the large fuel subroutine burning out of Albini's (1976b) fire modeling program.