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The present study numerically investigated the gas leakage characteristics in a simplified underground combined cycle power plant. The effect of obstacles near a crack location on the gas concentration in the confined space was analyzed by using the lower flammable limit (LFL) of methane gas. When the jet flow was close to the vertical walls, the longitudinal leakage distance increased by about 60% (when an obstacles was present) compared to the case without any obstacle, because these obstacles prevented transverse flows. In addition, when an air filterwas installed near to the trajectory of the gas flow, the longitudinal leakage distance was similar to the distance between the crack and obstacle, whereas the transverse leakage distance increased up to 8 times compared to the casewithout any obstacle. As the jet flow impacts on the obstacle and changes its direction, the gas flows recirculate.Therefore, it is necessary to consider the effect of the structure and facility locations on the trajectory of the jet flowto propose an accident prevention system in confined spaces.

Numerical Study on Characteristics of Gas Leakage in an Underground Combined Cycle Power Plant