S. Vinogradov, S. Shakhov, O. Polivanov, D. Saveliev. Research of the influence of the parameters of the generation and supply systems of compressed air foam. С. 174-184.

 

Research of the influence of the parameters of the generation and supply systems of compressed air foam

 

Stanislav Vinogradov

National University of Civil Defenсe of Ukraine

http://orcid.org/0000-0003-2569-5489

 

Stanislav Shahov

National University of Civil Defenсe of Ukraine

http://orcid.org/0000-0003-3914-2914

 

Оlexander Polivanov

National University of Civil Defenсe of Ukraine

http://orcid.org/0000-0002-6396-1680

 

Dmytro Saveliev

National University of Civil Defenсe of Ukraine

http://orcid.org/0000-0002-4310-0437

 

DOI: https://doi.org/10.52363/2524-0226-2022-36-14

 

Keywords: compression foam, generation process, fire extinguishing, compression foam generation and supply system

 

Аnnotation

Based on the analysis of thermodynamic processes, input and output parameters and basic principles of construction of the system of generation and supply of compression foam, it was determined that the essential parameters are the pressure at the compressor outlet, the diameters of the liquid and gas nozzles. With the help of a mathematical model of the compression foam generation process, integrated into the MathLab software environment, a study of the influence of the parameters of the compression foam supply system on its multiplicity was carried out. It was established that an increase in pressure from 4 to 6 bar, as well as an increase in the diameter of the liquid nozzle from 4 to 8 mm, is accompanied by a decrease in multiplicity by 136 %. When the pressure is further increased to 8 bar and the diameter is increased to 12 mm, there is a decrease in the multiplicity by 85 %. In relation to the increase in the value of the factor levels from the lower level to the upper one, there is a decrease in the foam multiplicity by almost 4,2 times. In the case of increasing the pressure and increasing the diameter of the air supply nozzle by 1,5 times, under the given conditions, there is an increase in the multiplicity of almost 2,5 times and is 18. In the case of increasing the pressure by 2 times and increasing the size of the air supply hole by 200 % from the lower levels of the factors in Table 1, there is an increase in the multiplicity of almost 4,5 times. It was established that the foam multiplicity K is affected by the throughput of water Dliq and air Dair nozzles. In the case of an increase or decrease in the water nozzle Dliq, the foam multiplicity K decreases or increases, respectively. The change in the multiplicity K from a change in the diameter of the air nozzle Dair is inversely proportional to the water nozzle Dliq, namely, for an increase or decrease in the diameter of the air nozzle da, the multiplicity K increases or decreases, respectively. Regression equations have been obtained, which allow further determination of the required parameters of systems for generating and supplying compression foam, depending on the foam of which multiplicity must be obtained.

 

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