Using the PIV Techniques in the Expertise of Gas Explosions

Mining Revue ◽  
2021 ◽  
Vol 27 (2) ◽  
pp. 42-48
Author(s):  
Nicolae Ioan Vlasin ◽  
George Artur Găman ◽  
Emilian Ghicioi ◽  
Gheorghe Daniel Floarea ◽  
Adrian Bogdan Șimon-Marinică
Keyword(s):  
Suspended Particles ◽  
Test Stand ◽  
Laser Source ◽  
Cmos Camera ◽  
Fuel Gas ◽  
Combustible Gas ◽  
Physical Experiments ◽  
Gas Leak ◽  
Gas Explosions ◽  
Recording Conditions

Abstract Given the possibilities offered by PIV systems, it was considered appropriate to test them in the study of the formation of explosive atmospheres. In this sense, within the INCD INSEMEX Petroșani laboratories, a test stand was created subject to the conditions of applying PIV techniques. Thus, this stand was built of transparent materials, having the possibility to introduce, in the inner volume, the suspended particles and the combustible gas, being at the same time able to be sectioned by the light plane generated by a laser source and to provide the recording conditions using a CMOS camera. The physical experiments concerned both the situation of a normal atmosphere inside the test stand and the situations of the appearance of a fuel gas leak and an efficient source of initiation of the formed explosive atmosphere.

scholarly journals SELECTED TECHNICAL AND LEGAL ASPECTS OF THE PNEUMATIC LAUNCHER OPERATION FOR HOPKINSON MEASURING BARS SET

2020 ◽  
Author(s):  
Kamil Sobczyk ◽  
Leopold Kruszka ◽  
Ryszard Chmielewski ◽  
Ryszard Rekucki
Keyword(s):  
Mechanical Test ◽  
Dynamic Properties ◽  
Construction Materials ◽  
Legal Aspects ◽  
Test Stand ◽  
Physical Experiments ◽  
University Of Technology ◽  
Split Hopkinson ◽  
Material Sample ◽  
The Military

The paper presents selected technical and legal areas of the exploitation of a pneumatic launcher as an essential part of the mechanical test stand of the split Hopkinson bar for testing the dynamic properties of construction materials. The process of impact loading of the tested material sample is carried out by means of a loading bar-projectile fired from this launcher. The concept of the first stage of the modernization of the pneumatic launcher used at the Institute of Civil Engineering of the Military University of Technology (MUT) for over 20 years was discussed in order to facilitate the performance of physical experiments. The formal and legal requirements for the design, construction and usage of a test stand with a pneumatic launcher in a laboratory room are presented.

Modelling of Sonic Jets for Gas Leak Applications

2019 ◽  
Author(s):  
Stefano Minotti ◽  
Alessandro Corsini ◽  
Giovanni Delibra ◽  
Gabriele Lucherini ◽  
Stefano Rossin ◽  
...  
Keyword(s):  
Gas Turbine ◽  
Ventilation System ◽  
Supersonic Jet ◽  
Cfd Simulations ◽  
Fuel Gas ◽  
Safety Issues ◽  
Gas Leakage ◽  
Round Jets ◽  
Gas Leak ◽  
Gas System

Abstract Design of gas turbine packages is subjected to safety issues and the related guidelines are provided by ISO-21789. According to this code, the ventilation system shall guarantee a good and safe dilution in case of an unexpected gas leakage from components of the fuel gas system inside the enclosure. The evaluation of the dilution is commonly carried out by CFD simulations and the ISO-21789 indicates the criteria to evaluate the danger of a gas leak by estimating the cloud volume of the explosive mixture. To follow this prescription and to properly calculate the exact volume cloud, it is fundamental to accurately reproduce the fuel gas leak, which is always a supersonic jet of fuel gas into an air-ventilated domain. The main criticality is to simulate a supersonic jet into a complex domain such as the gas turbine package, considering the industrial goals in terms of accuracy and time constraints. The complexity is due to the geometry of the package and to the multiple locations where the leakage could occur. In such context, it is preferable to develop an advanced modeling of the phenomenon rather than simply improve the detail of the CFD, that could turn out to be unfeasible for industrial goals. For this reason, the authors present a series of simulations of under-expanded jets at high pressure ratios carried out to investigate the applicability of the sonic source approach to not-round jets.

scholarly journals Ignition source localization in gaseous mixtures explosions expertise

2020 ◽  
Vol 305 ◽  
pp. 00035
Author(s):  
Nicolae Ioan Vlasin ◽  
Gheorghe-Daniel Florea
Keyword(s):  
Technical Expertise ◽  
Geometric Complexity ◽  
Computational Simulations ◽  
Gas Explosion ◽  
Fuel Gas ◽  
Gaseous Mixtures ◽  
Gas Leakage ◽  
Gas Source ◽  
Combustible Gas ◽  
Areas Of Interest

Gas-explosion events in the private or industrial field are usually followed by a technical analysis of the factors that led to their generation. In this respect, INCD INSEMEX Petroşani is accredited for conducting the technical expertise and for the elaboration of the Expertise Report. Starting with on-site findings and sampling, research continues at INCD INSEMEX laboratories, grouped on areas of interest in case management (electrical, ventilation, chemical, pyrotechnics, etc.). Determining the causes of the event implicitly involves establishing the probable source of initiation of the explosive mixture, after discovering the fuel gas source and analyzing how the mixture was formed. Due to the geometric complexity of the space in which the explosion occurred, incident, reflected or compound shock waves generated by explosion can create a footprint of the event that questions the location of the source of initiation. Depending on the possible sources found in the field, the INSEMEX Laboratory of Computational Simulations performs analyzes based on finite elements and finite volumes methods. The elements taken into account in the computational simulations concern both the geometry of the space, the nature of the combustible gas leakage, the dispersion of the gas, and the resulting thermal and mechanical effects.

CFD calculations of gas leak dispersion and subsequent gas explosions: Validation against ignited impinging hydrogen jet experiments

2010 ◽  
Vol 179 (1-3) ◽  
pp. 84-94 ◽  
Author(s):  
Prankul Middha ◽  
Olav R. Hansen ◽  
Joachim Grune ◽  
Alexei Kotchourko
Keyword(s):  
Gas Leak ◽  
Gas Explosions

scholarly journals Process of Natural Gas Explosion in Linked Vessels with Three Structures Obtained Using Numerical Simulation

Processes ◽  
2020 ◽  
Vol 8 (1) ◽  
pp. 52 ◽  
Author(s):  
Qiuhong Wang ◽  
Yilin Sun ◽  
Xin Li ◽  
Chi-Min Shu ◽  
Zhirong Wang ◽  
...  
Keyword(s):  
Experimental Data ◽  
Natural Gas ◽  
Time Pressure ◽  
Combustion Products ◽  
Gas Explosion ◽  
Spherical Vessel ◽  
Flame Acceleration ◽  
Physical Experiments ◽  
Gas Explosions ◽  
Simulation Results

Combinations of spherical vessels and pipes are frequently employed in industries. Scholars have primarily studied gas explosions in closed vessels and pipes. However, knowledge of combined spherical vessel and pipe systems is limited. Therefore, a flame acceleration simulator was implemented with computational fluid dynamics software and was employed to conduct natural gas explosions in three structures, including a single spherical vessel, a single spherical vessel with a pipe connected to it, and a big spherical vessel connected to a small spherical vessel with a pipe. These simulations reflected physical experiments conducted by at Nanjing Tech University. By changing the sizes of vessels, lengths of pipes, and ignition positions in linked vessels, we obtained relevant laws for the time, pressure, temperature, and concentrations of combustion products. Moreover, the processes of natural gas explosions in different structures were obtained from simulation results. Simulation results agreed strongly with corresponding experimental data, validating the reliability of simulation.

A Study on the Development and Accuracy Improvement of an IR Combustible Gas Leak Detector with Explosion Proof

2014 ◽  
Vol 18 (3) ◽  
pp. 1-12 ◽  
Author(s):  
Gyou-Tae Park ◽  
Geun-Jun Lyu ◽  
Young-Do Jo ◽  
Jeong-Rock Kwon ◽  
Sang-Guk Ahn ◽  
...  
Keyword(s):  
Leak Detector ◽  
Accuracy Improvement ◽  
Combustible Gas ◽  
Gas Leak

DPSS Nd:YAG Laser Precission Machining of Monocrystalline Sapphire

2013 ◽  
Vol 554-557 ◽  
pp. 1922-1929
Author(s):  
Dominik Wyszynski ◽  
Piotr Lipiec ◽  
Sebastian Skoczypiec
Keyword(s):  
Mathematical Model ◽  
Laser Beam ◽  
Pulse Laser ◽  
Nd:Yag Laser ◽  
Test Stand ◽  
Laser Source ◽  
Medical Applications ◽  
Machining Parameters ◽  
The Mathematical Model

The paper presents some aspects concerning use of pulse laser source for precise machining of Al2O3 crystals for medical applications. The scheme of laser beam manipulation and the test stand has been presented. Application of the mathematical model enabled determination of values of basic sapphire machining parameters. Presented results gave rough information about dynamics of the process and were used for the test stand designing, development as well as determination of machining precision.

scholarly journals Numerical analysis of the diffusion effects of combustible gas leak on the leak location

2017 ◽  
Vol 205 ◽  
pp. 3678-3685 ◽  
Author(s):  
Xingquan Li ◽  
Zuotang Wang ◽  
Guansan Tian ◽  
Jian Liu ◽  
Desheng Li
Keyword(s):  
Numerical Analysis ◽  
Combustible Gas ◽  
Leak Location ◽  
Gas Leak ◽  
Diffusion Effects

scholarly journals Experimental Study On The Explosion Characteristics of Hydrogen-methane Premixed Gas in Complex Pipe Networks

2021 ◽  
Author(s):  
Jinzhang Jia ◽  
Yinuo Chen ◽  
Guangbo Che ◽  
Jinchao Zhu ◽  
Fengxiao Wang ◽  
...  
Keyword(s):  
Volume Fraction ◽  
Flame Temperature ◽  
Flame Velocity ◽  
Pipe Network ◽  
Fuel Gas ◽  
Pipe Networks ◽  
Gas Explosions ◽  
Explosion Overpressure ◽  
Evolution Laws ◽  
And Control

Abstract To explore the overpressure evolution laws and flame propagation characteristics in complex pipe networks after the addition of hydrogen to methane, we experimentally studied the explosive pressure wave and flame wave propagation laws for three different premixed gas mixtures with hydrogen-methane concentrations of 0, 10% and 20% when the equivalence ratio was 1. Experimental results indicate that the maximum explosion overpressure of the premixed gas increases with increasing distance from the explosion source, and it shows a gradually decreasing trend. In the complex pipe network, an overpressure zone is formed in the B-E-H and D-E sections of the network. The flame temperature is superimposed with the superimposition of the pressure, showing a trend of first increasing, then decreasing, then increasing, and finally decreasing in the complex pipe network. The flame arrival time increases with increasing distance, and the maximum flame speed shows a decreasing trend. The peak overpressure and maximum flame velocity of the premixed gas under a hydrogen volume fraction of 20% are 1.266 MPa and 168. The experimental research results could provide important theoretical guidelines for the prevention and control of fuel gas explosions in urban pipe networks.

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