Abstract
In this work, the safety performance and loading behavior of a large-scale facility were studied using experimental observations, numerical simulations and theoretical calculations. Furthermore, the effects of concentration, pressure relief and volume on the shock wave loadings were investigated. In particular, based on the dimensional theoretical analysis, a model for the analysis of overpressure peak and impulse for such facilities was proposed. The results showed that if concentration was larger than 10.5 %, the peak overpressure and the maximum overpressure rate were decreased; if the ignition mode was chemical, the propagation speed of flame was increased. In addition, it was found that the overpressure was the largest if the concentration was 9.5 %, and with the increase of the distance from the ignition source, the overpressure peak decreased first and then increased. The present study and results can therefore provide the loading information to enhance the antiexplosion performance of such facilities, which is very promising for the future safety evaluations and fault diagnosis of buildings, and constructions in various fields, especially, for nuclear power stations.
Highlights
China is carrying out large-scale urbanization construction
It can be seen from the Eq (3) that in the case of the mixed concentration c = 9.5 % and the pressure relief vent S = 4 m2, the peak of overpressure ΔP is related to mixed volume V and the distance L, that is: ΔP =
By the means of experimental research, numerical analysis and theoretical calculation, the characteristics of natural blast load in the facility are studied, and the main research results are as follows: 1) The experimental research shows that when the concentration of methane is 10.5 %, the explosion test phenomenon is obvious, the peak of overpressure and the overpressure rise rate are the largest
Summary
China is carrying out large-scale urbanization construction. In order to improve the construction and operation safety of municipal pipelines, large-scale public facilities were built in newly-built urban. The experimental and theoretical study on the flame propagation of premixed matters in a small cylindrical vessel with an aspect ratio of 3:1 was carried out by Fairweather [3] He analyzed the law of flame propagation under barrier-free and barrier, and concluded that the explosion overpressure is mainly formed by turbulent combustion caused by barrier. Salzano [8] studied the effects of concentration and initial pressure on peak overpressure, overpressure rise rate and combustion rate by hydrogen-methane air explosion test in a 5 L vessel. In the present work, based on a completed explosion model, we investigated the blast loading characteristics of a typical facility in order to achieve the shock wave propagation law and distributions of the explosion. The present research and the results can provide the loading information for the safety assessment and further improve the anti-explosion safety performance of the facilities
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
