Analýza zatížení stavebních konstrukcí vystavených účinkům působení vzdušných tlakových vln

Abstract

MYNARZ, M., Analysis of Actions on Structures Subjected to Air Pressure Waves, Ostrava, 2017, 142 p., Ph.D. thesis. VŠB – Technical University of Ostrava, Faculty of Civil Engineering, Thesis supervisor: doc. Ing. Jiří Brožovský, Ph.D.

The submitted dissertation is concerned with experimental and mathematical methods for determination of basic explosion parameters of gas mixtures. The aim of the dissertation is to analyse the parameters of air pressure waves generated by deflagration transformation of methane-air mixture in terms of venting process. This work also proposes to evaluate the cogency of computational procedures for modelling of venting deflagration based on the comparison with the results of realised experimental measuring. The theoretical part of the dissertation reviews the state of the art of the issue and current knowledge on theory of deflagration, combustion and air pressure waves is analysed. Furthermore, methods and processes for modelling of gas mixtures explosions are dealt. The experimental part of the submitted work describes the designed experimental setup and methodology of realised measurements. Considerable part of the chapter follows the factors influencing the deflagration itself and the explosion parameters. The results of experimental measurements were interpreted in detail and compared to particular findings of other workplaces. The analytical part of the dissertation deals with application of prediction models for determination of chosen explosion parameters, mainly reduced explosion pressure. Prediction models are applied to parameters of the designed experimental setup and afterwards the prediction results are compared to the experimental results. Finally, particular prediction models are compared according to their applicability for concrete conditions of the experimental setup. The final part of the dissertation is concerned with numerical simulations of deflagration processes. Within the simulations FLACS software is used. It is based on the computational fluid dynamics (CFD). The results obtained from created 3D numerical model of the experimental setup of the variable explosion chamber are compared to the results of realised experiments. At the conclusion of the submitted work, the achieved results and findings obtained from the applied science methods are summarized.