Analysis and simulation on the dynamic process of the air-blasting device

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 10 MPa compressed air, the cleaning scope is more than 160 meters at one time.