DOI: https://doi.org/10.20535/2521-1943.2019.87.183307

Calculation of Design Parameters of Fire-Fighting Water Curtains

Anatolii Vynogradov

Abstract


Purpose. The work is aimed at the practical application of previously obtained results of mathematical modeling of fire water curtains. Such water curtains are the jets of sprayed water intended to protect people and material values from the thermal radiation of fires.

 

Approach. Calculated formulas found as a result of mathematical modeling allow calculating the parameters of fire thermal radiation shielding by means of a water curtain and their dependence on the design parameters of technological equipment. In particular, these formulae are used to calculate the transmission coefficients of water curtains for thermal radiation of the near-infrared region of the spectrum (wavelength 1-10 microns). According to the formulas obtained, the coefficient of transmission of the water curtain depends on the distribution of droplets in size, specific water content, thickness of the curtain, and spectral characteristics of thermal radiation.

Findings. The complete set of calculated formulas obtained in the work allows determining the integral transmission coefficient of the water curtain or, conversely, for the predetermined transmission coefficient allows to calculate the design parameters of the protective system designed to create a water curtain. Accordingly, two calculation methods with corresponding algorithms of calculations are presented, each of which is followed by a typical concrete example of numerical calculations. The calculation formulas are simple enough, so the calculations can be done on the engineering calculator or using the computer mathematics packages. After performing a sufficient number of approbations and practical applications, the presented techniques can be used to create a standard design method for fire water curtains.


Keywords


fire-fighting water curtain; thermal radiation; calculation method.

References


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