Abstract: The penetration depth of the scrubbingcooling pipe in new type of scrubbingcooling chamber was investigated experimentally and numerically. The results of the experiment and numerical model were in good agreement, which indicated the reliability of the model. Based on this numerical model， the penetration depth in scrubbingcooling pipe outlet was investigated. The results were used to characterize interfacial fluctuation and pressure fluctuation signals characterizing circumfluence fluctuation. Both of them were analyzed in FFT method and main frequenies were got. It was found that the two main frequenies were consistent. Therefore, the fluctuation of the gasliquid interface was the major inducing factor that drove the circumfluence fluctuation in the chamber. In order to avoid the industry problems aroused by circumfluence fluctuation, some measures must be taken to improve the character of gas distribution in scrubbingcooling pipe outlet.