Analysis and simulation on the dynamic process of the air-blasting device
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摘要: 针对工业界对于安全有效的管道清洁装置的需求,设计了一种利用气动爆破的原理进行管道除垢的设备.该装置采用气动控制,利用压缩空气的瞬时释放产生的射流与冲击波的能量击碎管道内壁的附着物,实现管道除垢.通过分析装置工作的原理及运行过程,给出了重要参数的建模过程.通过仿真分析了气爆过程中压强、剪切力的分布特点以及传播过程,计算了其管道内气流速度场的分布变化,得出了气动弹爆破过程中对壁面产生的冲击主要来源于射流以及冲击波,并且在使用10MPa的工作压强下一次爆破可清理的管道范围超过160m.该设计可以高效的实现管道清污的作用.Abstract: To meet the need for a safe and effective device to clean the pipelines in the industry area, an air-blasting device was designed. The air-blasting device storages highly compressed air which could be got from air supplier and then, by suddenly releasing the compressed air, the supersonic jet current and shock waves will be generated. The shock wave and jet current will impact the wall of the pipelines to reduce the attaching dirt. The working process of this device was presented and the mathematic models of the dynamic process were built. Through simulation, the dynamic process was analyzed, and the distribution of the total pressure, velocity field, wall shear stress in the pipeline and the burst strength was given. The results show that the main energy of the cleaning force is from the shock waves and the jet current, not from the shear stress. And when using 10MPa compressed air, the cleaning scope is more than 160 meters at one time.
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Key words:
- pneumatic equipment /
- blast cleaning /
- shock waves /
- simulation
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