ZHANG Qianxi, LIANG Dong. Indication of lower flammability limit area of LNG jet release based on visible vapor cloud[J]. CIESC Journal, 2015, (S2): 425-429.
ZHANG Qianxi, LIANG Dong. Indication of lower flammability limit area of LNG jet release based on visible vapor cloud[J]. CIESC Journal, 2015, (S2): 425-429.DOI: 10.11949/j.issn.0438-1157.20150691.
Liquefied natural gas(LNG)jet release is common in LNG leakage accidents.It is very difficult to judge the leakage diffusion area through the senses for natural gas is colorless and odorless.While jet release can make the water vapor in the surrounding air into a visible cloud of steam due to its low temperature.Through the establishment of LNG jet release computational fluid dynamics(CFD)model
numerical simulations under different environmental conditions and jet velocity have been carried out
and the temperature field and species concentration field at different conditions are obtained.According to the environmental conditions and the temperature field distribution
the visible vapor cloud area can be ranged.The relationship between the distances at the lower flammability limit(LFL)concentration occurs and that corresponding to the visible contour of LNG vapor clouds has been summed up.During an emergency
the work can be a helpful to indicate the danger of cloud ignition and exclusion distances forecast.