DEPENDENCE OF COMPRESSION FOAM PROPERTIES FROM WORKING PARAMETERS OF FOAM GENERATION PROCESS
Analysis of known structures of compressed air foam systems (CAFS) as well as results of research of operational experiments, tests and studies of such systems carried out abroad allowed formulating the basic principle requirements to technological and constructive parameters of compressed air foam systems.
The general trend in the design of various structures, especially complex, built on the internal interaction of individual structural units is the development of a mathematical model, preceding appropriate constructive solution and often is the calculation basis for them. Mathematical model of the process of foam generation created made it possible to determine dependence of properties of foam being generated from structural and working parameters.
Based on the developed mathematical model of foam generation principal scheme of the process was proposed and a small-sized test facility was created for studying possibilities of generating compression foam according to the proposed scheme. Peculiarity of the work is an attempt to obtain compression foam according to the proposed scheme using domestically manufactured foam concentrates for general use with modernized existing portable fire extinguishing equipment which is at the disposal of Ukrainian fire divisions. Particular attention is paid to the analysis of the development of small-sized mobile and portable systems which can be used as an addition to existing fire-fighting equipment.
During the experiments the variables were brands and concentrations of foam concentrates, magnitude of air pressure in the system, and the ratio of foam solution to air. Dependence of the foam properties on the pressure drop on the outlet nozzle was established, so during each experiment it was controlled and maintained constant.
As a result of previous tests, possibility of generation of compression foam according to the proposed scheme with the use of synthetic foam concentrates for general use with existing fire equipment has been confirmed.