Abstract: To solve the problem of nozzle blockage in spraying operation of a reaction type coating decontaminant, a method of spraying reactive coating decontaminant with compressed air was proposed, and a special spraying nozzle was designed. A fluid analysis model of nozzle spraying process was also established, and its pressure, velocity and spraying state of the internal flow field of nozzle under different inlet pressures were simulated based on a CFD method. The analysis shows that when the nozzle inlet pressure is higher than 2 MPa, its spraying of reactive coating decontaminant is uniform. In order to verify the rationality of structure design and analysis model, a spraying test device was built, and the spraying performance of reactive coating decontaminant was tested. Its actual spraying effect was close to the simulation result. The spraying atomization of decontaminant was more uniform and spraying effect was better than before.

Key words: decontaminant, nozzle design, numerical simulation, experimental study, CFD