利用压缩气体驱离流体是密闭容器清理的一种重要方式，其工作过程中将形成复杂的气液两相流动现象并诱发剧烈噪声。为揭示密闭容器清吹过程中复杂流动发展演化规律及流噪声形成机理，优化密闭容器清吹参数从而控制清吹噪声，本文基于VOF表面跟踪法和Lighthill声类比原理，采用CFD-CA相结合的混合模拟方法对密闭容器清吹过程的流场和声场进行仿真分析和优化研究。研究结果表明：密闭容器清吹过程中，高速气体射流将对液面产生剧烈的冲击作用而形成漩涡、液体破碎和气泡弥散等流态，诱发复杂的不稳定气液两相流动，从而激发剧烈的噪声并影响清吹效率。进气压力将直接影响密闭容器内部流场特性，并进一步影响清吹效率和噪声特性，当进气压力高于1MPa，气体将沿罐壁进入排水管路形成不稳定的气液混合流动，导致有效排除流量和清吹效率降低。噪声随进出口压差升高而增加，进气压力1MPa时总声压级比0.3MPa时高10dB，为兼顾清吹效率和噪声特性，采用0.5MPa的气体压力具有较好综合性能。根据密闭容器内部流场特性对进气结构进行优化，采用倾斜进气和倾斜渐扩进气结构，清吹效率分别提高了15%和27%，总声压级降低了10dB和7dB。

The using of compressed gas to drive away the fluid is an important way to clean up the confined container, which can form complex gas-liquid two-phase flow and induce severe noise. In order to reveal the evolution law of the complex flow and formation mechanism of flow noise in the cleaning process of confined vessel, optimize the blowing parameters to control blowing noise, the hybrid simulation method combined with CFD-CAA was used to optimize the flow-sound field of confined container blowing process. The results show that the high-speed gas jet have a severe impact on the liquid surface, forming flow patterns such as vortex, liquid fragmentation and bubble dispersion, and induce complex unstable gas-liquid two-phase flow. so as to stimulate intense noise and affect the cleaning efficiency. When inlet pressure is higher than 1MPa, the gas enter the drainage pipe along the tank wall to form an unstable gas-liquid mixed flow, resulting in the effective removal flow and blowing efficiency reduced. The total sound pressure level at 1MPa is 10dB higher than that at 0.3MPa. In order to take into account the cleaning efficiency and noise characteristics, 0.5MPa gas pressure has better comprehensive performance. By adopting inclined intake and extended intake structure, the intake structure is optimized according to the simulation. The cleaning efficiency is increased by 15% and 27% respectively, and the total sound pressure level is reduced by 10dB and 7dB.