[PDF] A Study On Pulsation In Runehamar Tunnel Fire Tests With Forced Longitudinal Ventilation eBook

Author :
Publisher :
Page : 112 pages
File Size : 12,53 MB
Release : 2006
Category : Fire dynamics simulator (Computer program)
ISBN :

GET BOOK

Abstract: Fire tests involving heavy goods vehicles (HGVs) in a road tunnel with forced ventilation in Norway, conducted by SP, demonstrated a pulsation phenomena that is similar to oscillating flames and thermo-acoustic instabilities previously observed in vitiated compartments and resonant systems that meet the Rayleigh criterion, respectively. This current study investigates whether the causal phenomena can be determined using either a simple, one-dimensional fluid dynamics model or a computation fluid dynamics program. It is assumed that the leading cause for pulsation is a locally under-ventilated fire. Theoretical analysis shows that this assumption is valid and how such conditions can cause the flow field to change. A simple model is developed for a tunnel fire with forced, longitudinal ventilation. The results qualitatively represent the test data and support the assumption of a locally vitiated fire. A more sophisticated analysis, involving the Fire Dynamics Simulator (FDS) Version 4.0, provides similar results. Although FDS calibration, using similar experiment data from the Memorial Tunnel Ventilation Test Program, demonstrates model limitations in predicting smoke layers near the solid boundaries under forced flow field, the qualitative results from both models indicates that pulsation in large tunnel fires under forced ventilation conditions results from poor mixing of the bulk flow in the near field of the fire.

Author : Haukur Ingason
Publisher :
Page : 26 pages
File Size : 25,43 MB
Release : 1994
Category : Fires
ISBN : 9789178484676

GET BOOK

This report describes measurements of heat release rates in tunnel fires by using the oxygen consumption technique. This technique is commonly used in fire laboratories to measure heat release rates up to 10 MW. Measured heat release rates from fire tests with vehicles (a train, a bus, a subway coach and a simulated truck load) and wood cribs are presented. The total heat release rate was determined by measuring oxygen concentrations and mass flow rates over the tunnel cross section at both sides of the fire. The convective fraction of the heat release rate was determined by measuring the temperature and the mass flow rate. The technique is found to work reasonably well for tunnel fires. However, the measured convective fraction of the heat release rate need to be corrected for heat losses from the hot ceiling jet to the cold walls. The total heat release rate need to be corrected for high yields of carbon dioxide (CO2) in the exhaust gases and for vitiation of the inflowing air in the lower part of the cross section. The study is a joint project between a number of European countries with a project name EUREKA EU 499 Firetun.

Author : Purushotham Tukkaraja
Publisher : CRC Press
Page : 580 pages
File Size : 49,13 MB
Release : 2021-06-29
Category : Technology & Engineering
ISBN : 1000464253

GET BOOK

This volume contains the proceedings of the 18th North American Mine Ventilation Symposium held, on a virtual platform, June 12-17, 2021. This symposium was organized by South Dakota Mines, Rapid City, South Dakota, in collaboration with the Underground Ventilation Committee (UVC) of the Society for Mining, Metallurgy & Exploration (SME). The Mine Ventilation Symposium series has always been a premier forum for ventilation experts, practitioners, educators, students, regulators, and manufacturers from around the world to exchange knowledge, ideas, and opinions. This volume features fifty-seven selected technical papers in a wide range of topics including: auxiliary ventilation, case studies of mine ventilation, computational fluid dynamics applications in mine ventilation, diesel particulate control, electric machinery in mine ventilation, mine cooling and refrigeration, mine dust monitoring and control, mine fans, mine fires and explosion prevention, mine gases, mine heat, mine management and organization of ventilation, mine ventilation and automation, occupational health and safety in mine ventilation, renewable/alternative energy in mine ventilation, ventilation monitoring and measurement, ventilation network analysis and optimization, and ventilation planning and design.

Author : Richard Carvel
Publisher : Thomas Telford
Page : 544 pages
File Size : 27,10 MB
Release : 2005
Category : Political Science
ISBN : 9780727731685

GET BOOK

Like New, No Highlights,No Markup,all pages are intact.

Author : Charles Scawthorn
Publisher : ASCE Publications
Page : 362 pages
File Size : 34,58 MB
Release : 2005-01-01
Category : Technology & Engineering
ISBN : 9780784475515

GET BOOK

Prepared by the Technical Council on Lifeline Earthquake Engineering of ASCE. This TCLEE Monograph covers the entire range of fire following earthquake (FFE) issues, from historical fires to 20th-century fires in Kobe, San Francisco, Oakland, Berkeley, and Northridge. FFE has the potential of causing catastrophic losses in the United States, Japan, Canada, New Zealand, and other seismically active countries with wood houses. This comprehensive book on FFE and urban conflagrations provides state-of-the-practice insight on unique issues, such as large diameter flex hose applications by fire and water departments. Topics include: History of past fires; Computer modeling of fire spread in the post-earthquake urban environment; Concurrent damage and fire impacts for water, power gas, communication and transportation systems; Examples of reliable water systems built or designed in San Francisco, Vancouver, Berkeley, and Kyoto; Use of large diameter (5 in.) and ultralarge diameter (12 in.) flex hose for fire fighting and water restoration; and Cost-effectiveness of various FFE mitigation strategies, with a detailed benefit-cost model. Water utility engineers, fire fighting professionals, and emergency response planners will benefit from reading this book.

Author : Vivek Apte
Publisher : Woodhead Publishing
Page : 466 pages
File Size : 18,10 MB
Release : 2021-11-17
Category : Technology & Engineering
ISBN : 0081028180

GET BOOK

Flammability Testing of Materials used in Construction, Transport, and Mining, Second Edition provides an authoritative guide to current best practice in ensuring fire-safe design. The book begins by discussing the fundamentals of flammability, measurement techniques, and the main types of fire tests for various applications. Building on this foundation, a group of chapters then reviews tests for key materials used in the building, transport, and mining sectors. There are chapters on wood products, external cladding, and sandwich panels as well as the flammability of walls and ceilings linings. Tests for upholstered furniture and mattresses, cables, and electrical appliances are also reviewed. A final group of chapters discusses fire tests for the transport sector, including those for railway passenger cars, aircraft, road and rail tunnels, ships, and submarines. There is also a chapter on tests for spontaneous ignition of solid materials. With its distinguished international team of contributors, Flammability Testing of Materials used in Construction, Transport, and Mining is an invaluable reference for fire safety, civil, chemical, mechanical, mining and transport engineers. In this revised edition, the latest information is provided on fire testing of products, systems, components, and materials used across these essential sectors, with all regulations and standards brought up to date. Relays all new developments in fire safety standards, regulations and performance requirements Covers a broad range of infrastructure sectors such as construction, transport, and mining Updated to include cutting-edge fire tests and the latest iteration of standards including ISO, ASTM, and EN