On the Efficiency of Blast Relief Panels Located in the Cover



Annotation:

The dynamics of the development of an internal explosion is studied considering the action of blast relief panels. The time spent on the exit of the blast relief panel from the opening, as well as the effect of gravity, are considered. The processes are investigated from the moment the blast relief panel leaves the opening and until it is fully opened. A model is formed considering the initial speed of the blast relief panel at the exit from the opening. The model is limited to considering the pressures, at which it is assumed that the degree of expansion of gases during combustion is unchanged, and to determine the rate of gas outflow, the Bernoulli equation for an incompressible liquid is applicable.

Dimensionless complexes and parameters characterizing the process under study are established. As a final result, the dependence of the maximum pressure during the opening-up of the opening (the first peak) from the dimensionless complex based on the initial data is proposed. Among them are the characteristics of the blast relief panel, the combustion rate, the geometric shape, and dimensions of the opening.

It is concluded that the maximum possible pressure at the first peak does not directly depend on the area of the opening. The rate of pressure relief at the moment of opening-up of the opening is determined by the area of the side space calculated as the product of the perimeter of the opening to the amount of displacement of the blast relief panel. A method is proposed for reducing pressure at the first peak by increasing the number of openings while maintaining the total area for pressure relief, which depends on the bearing capacity of panels. The results obtained allow to establish under what conditions the pressure at the first peak exceeds the pressure at the second one. Thanks to this, it is possible to adjust the explosion resistance of an object by changing the design of a blast relief panel, or by strengthening the load-bearing elements.

References:
1. Gorev V.A., Salymova E.Yu. Usage of sandwich-panels as effective easily jettisonable constructions by inside combustions in individual buildings. Pozharovzryvobezopasnost = Fire and Explosion Safety. 2010. Vol. 19. № 2. pp. 41–44 (In Russ.).
2. Gorev V.A. Ensuring explosion safety of residential buildings. MATEC Web of Conferences. 2018. Vol. 193. DOI: 10.1051/matecconf/201819303046 
3. Gorev V.A., Chelekova E.Yu., Leshchev N.V. Initial Stage of the Explosion with a Blast Relief Panel Structure Located in the Roof of the Building. Bezopasnost Truda v Promyshlennosti = Occupational Safety in Industry. 2022. № 12. pp. 29–35. (In Russ.). DOI: 10.24000/0409-2961-2022-12-29-35 
4. Loytsyanskiy L.G. Fluid and gas mechanics: textbook. 7-e izd., ispr. Moscow: Drofa, 2003. 840 p. (In Russ.).
5. Rastorguev B.S., Plotnikov A.I., Khusnutdinov D.Z. Design of buildings and structures under emergency explosive impacts: textbook. Мoscow: Izd-vo ASV, 2007. 152 p. (In Russ.).
6. Pilyugin L.P. Building structures of explosive production facilities (theoretical foundations of design). Мoscow: Stroyizdat, 1988. 316 p. (In Russ.).
7. Pilyugin L.P. Forecasting the consequences of internal emergency explosions. Мoscow: Pozhnauka, 2010. 380 p. (In Russ.).
8. Luzhin O.V., Popov H.H., Pastorguev B.C. Calculation of building structures for the action of explosive waves. Dinamicheskiy raschet sooruzheniy na spetsialnye vozdeystviya: sprav. proektirovshchika (Dynamic calculation of structures for special effects: designer reference guide). Мoscow: Stroyizdat, 1981. pp. 5–28. (In Russ.).
9. Molkov V.V., Nekrasov V.P. Dynamics of gas combustion in a constant volume in the presence of an outflow. Fizika goreniya i vzryva = Physics of combustion and explosion. 1981. № 4. pp. 17–24. (In Russ.).
10. Babkin V.S., Senachin P.K., Krakhtinova T.V. Peculiarities of gas combustion dynamics in the closed vessels under different laws of flame surface variation. Fizika goreniya i vzryva = Physics of combustion and explosion. 1982. № 6. pp. 14–20. (In Russ.).
11. Molkov V.V., Eber R.M., Grigorash A.V., Tamanini F., Dobashi R. Vented gaseous deflagrations: modelling of translating inertial vent covers. Journal of Loss Prevention in the Process Industries. 2003. Vol. 16. Iss. 5. pp. 395–402. DOI: 10.1016s0950-4230(03)00066-4
12. Molkov V., Grigorash A., Eber R, Tamanini F., Dobashi R. Vented gaseous deflagrations with inertial vent covers: State-of-the-art and progress. Process Safety Progress. 2004. Vol. 23. Iss. 1. pp. 29–36. DOI: 10.1002/prs.10002
13. Solberg D.M., Pappas J.A., Skramstad E. Observations of flame instabilities in large scale vented gas explosions. Symposium (International) on Combustion. 1981. Vol. 18. Iss. 1. pp. 1607–1614. DOI: 10.1016/S0082-0784(81)80164-6
14. Zalosh R.G. Gas explosion tests in room-size vented enclosures. Proceedings of the 13th Loss Prevention Symposium. Houston, 1979. P. 98–108.
15. Shchelkin K.I., Troshin Ya.K. Gas dynamics of combustion. Moscow: Izdatelstvo Akademii nauk SSSR, 1963. 255 p. (In Russ.).
16. Kuznetsov V.R., Sabelnikov V.A. Turbulence and combustion. Мoscow: Nauka, 1986. 290 p.
DOI: 10.24000/0409-2961-2023-5-7-14
Year: 2023
Issue num: May
Keywords : bearing capacity blast relief panel combustion rate internal explosion pressure relief opening pressure opening cover
Authors:
  • Gorev V.A.
    Dr. Sci. (Phys.–Math.), Prof., va.gorev@yandex.ru Moscow State University of Civil Engineering, Moscow, Russia
  • Chelekova E.Yu.
    Cand. Sci. (Eng.), Assoc. Prof. of the Department, kiara_lion@mail.ru Moscow State University of Civil Engineering, Moscow, Russia
  • Leshchev N.V.
    Student Moscow State University of Civil Engineering, Moscow, Russia