Abstract: In view of high Reynolds number flow around a cylinder, the problem of how to put off a fire is carried out based on experimental research. It is showed that within a certain range, the flame extinction time is proportion to the obstacle diameter, the distance between candles and obstacles and the candles burning rate, and it is inversely proportional to the flow velocity of the obstacle. Through the analysis, it is found that the experimental data and the theoretical analysis are consistent, which indicate that the experiment conclusion is correct and the experimental method is feasible. Furthermore, it provides an important support for the indepth study of the flow around a cylinder, flame combustion problems and the relationship between them.

Key words: flow around a cylinder, high Reynolds number, candle burning, put out the fire