Experimental study on flame height, gas temperature and oxygen concentration profiles under spray fire scenario in an enclosed compartment

2020 ◽  
Vol 33 (7) ◽  
pp. 650-667
Author(s):  
Fangpeng Guo ◽  
Changjian Wang ◽  
Jiaqing Zhang ◽  
Shenlin Yang ◽  
Hao Sun
Keyword(s):  
Experimental Study ◽  
Oxygen Concentration ◽  
Flame Height ◽  
Concentration Profiles ◽  
Gas Temperature ◽  
Fire Scenario

Experimental study on vertical rigid and flexible polyurethane fire suppression using water spray

2019 ◽  
pp. 089270571987918
Author(s):  
Hengze Zhao ◽  
Ye Li ◽  
Yipei Qi ◽  
Xuanmeng Dong ◽  
Yongming Zhang ◽  
...  
Keyword(s):  
Experimental Study ◽  
Video Processing ◽  
Fire Suppression ◽  
Application Rate ◽  
Flame Height ◽  
Operating Pressure ◽  
Water Spray ◽  
Surface Cooling ◽  
Front Position ◽  
Flexible Polyurethane

A series of vertical fire suppression experiments on rigid polyurethane (RPU) and flexible polyurethane (FPU) with/without water spray were conducted in a standard chamber. A new video processing method was developed to determine the pyrolysis front position of wind-aided flame. Averaged flame height, carbon monoxide/hydrogen cyanide concentration, view factors, and extinguishing time were determined with operating pressure varying from 0.15 MPa to 0.4 MPa. The experimental study showed that water spray would suppress RPU/FPU fire mainly by fuel surface cooling. Furthermore, the perfect water spray pressure for RPU/FPU fire suppression was 0.3 MPa and the corresponding water application rate was 0.7511 mg/(cm2·s).

The experimental study on the performance of a small-scale oxygen concentration by PSA

2005 ◽  
Vol 42 (2) ◽  
pp. 123-127 ◽  
Author(s):  
Z. Yuwen ◽  
W. Yuyuan ◽  
G. Jianying ◽  
Z. Jilin
Keyword(s):  
Experimental Study ◽  
Oxygen Concentration ◽  
Small Scale

Preliminary Thermal Analyses on Diesel Converter Overheating

2004 ◽  
Author(s):  
Jun Zuo ◽  
Meiping Wang ◽  
Graham T. Reader ◽  
Ming Zheng
Keyword(s):  
Oxygen Concentration ◽  
Active Flow Control ◽  
Thermal Analyses ◽  
Gas Temperature ◽  
Engine Exhaust ◽  
Transient Model ◽  
Exhaust Temperature ◽  
Combustible Gas ◽  
Soot Loading ◽  
Reduce Emissions

The use of oxidation catalytic converters (OCC) in Diesel engines has proved to be an effective method to reduce emissions of total hydrocarbons (THC), carbon monoxide (CO), and the soluble organic fractions (SOF) of particulate matter (PM). However, the exothermal reaction effected by the oxidation of THC, CO, and especially the soot accumulated in the converters impose a risk of catalytic flow bed overheating that subsequently results in catalyst failure and may cause safety concerns. This paper presents a one-dimensional transient model that uses an energy balance method to analyze the overheating scenario when considering combustible gas reaction, clogged soot burning, and active flow control for a number of Diesel aftertreatment devices. The monolith temperature profiles were simulated by varying the exhaust gas temperature, oxygen concentration, and flow rate. Simulation results indicated that the potential of overheating elevates with increases in combustible gas concentration, soot loading, oxygen concentration, and engine exhaust temperature. The impacts of active control, such as flow reversal control, on converter overheating have also been investigated therein.

Myringosclerosis Caused by Increased Oxygen Concentration in Traumatized Tympanic Membranes Experimental Study

1995 ◽  
Vol 104 (8) ◽  
pp. 625-632 ◽  
Author(s):  
Cecilia Mattsson ◽  
Karin Magnuson ◽  
Sten Hellström
Keyword(s):  
Experimental Study ◽  
Oxygen Concentration ◽  
Middle Ear ◽  
Oxygen Radicals ◽  
Ambient Air ◽  
Fourth Group ◽  
Oxygen Concentrations ◽  
Tympanic Membranes

The purpose of this study was to elucidate possible relationships between the oxygen concentration of the middle ear cavity and the development of myringosclerosis. Three groups of rats with myringotomized tympanic membranes were exposed to different oxygen concentrations of 10%, 15%, and 40%, respectively, for 1 week. A fourth group was kept in ambient air. Two other groups of rats with myringotomized and intubated tympanic membranes were exposed to oxygen concentrations of 10% and 40%, respectively, for the same period of time. Otomicroscopically, all hyperoxic animals had more numerous myringosclerotic lesions compared with the ambient air group, and also displayed a pronounced hyperplasia of the keratinizing epithelium around the perforation border. By contrast, the hypoxic animals showed less pronounced myringosclerotic lesions or even completely lacked them. It is inferred that an increased oxygen concentration in the middle ear cavity will increase the likelihood of myringosclerotic deposits. The mechanism involved could be related to the formation of oxygen radicals.

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