Scientific Journal of KubSAU

In this article the basic principles of air-fuel mixture explosions and striking factors, such as air-striking wave, gas streams, splinters, flame heat, light radiation and sharp sounds are observed. The calculation technique of the emergency emission consequences which is for a quantitative estimation of air-striking wave parameters at air-fuel mixture explosions forming in the atmosphere at industrial failures is given. The basic structural elements of calculation algorithm are listed. It is supposed partial depressurization or full destruction of the equipment containing combustible substance in a gaseous or liquid phase, the emission of this substance in the atmosphere, the air-fuel mixture cloud formation, the air-fuel mixture initiation (ignition) and the explosive transformation (deflagration or detonation) in the air-fuel mixture cloud. The technique allows making the approached estimation of air-striking wave various parameters and defining the probable degrees of men defeat and building damage at failures with air-fuel mixture cloud explosions. The given technique is developed in C# language in the integrated environment of software Microsoft VisualStudio 2010 working out. The program fragment in which the calculation of dimensionless Px pressure and dimensionless Ix impulse is given

In the article, we have described the main causes of the fuel-air mixtures explosion and such affecting factors as air blast and fragmental fields. Explosions are performed using various sources of energy. The scale of the explosions consequences depends on their detonation power and the environment in which they occur. The range of the affected areas can reach several kilometers. The basic parameter that characterizes the explosives is the maximum pressure. Increasing distance from the explosion, the maximum pressure and pulse decrease and action duration increases. There is presented method, which is developed in Windows-based applications that allows investigate the dependence of the destruction level on the distance and the explosion epicenter. Algorithm of application operation implements automatically filling of the "molar mass of combustible material, g/mol" field depending on the user’s choice of the flammable substance name. After calculating the raw data, the user moves to the calculation of all the parameters and sees the results of the calculation. By default, the calculation results are presented in tabular form. Further, the results of calculation are presented with a graphical representation of data. The developed software can be used in the educational process at studying such disciplines as "Theory of burning and explosion", "The production safety", "Protection in emergency situations", and also be recommended to practical workers in the sphere of labor safety, prediction and assessment of the technological accidents and catastrophes consequences, teachers of this profile disciplines

The article describes derivation of the regression equation which permits to determine the maximum water speed at the experimental cluster-type automatic drinking bowl which depend on temperature difference, angle of obliquity and shearing angle of the water-discharge pipe branches which are perforated by elevation