| Aiming at the defects of the existing descaling method,this paper put forward a kind of high pressure mixture flow descaling(HPMFD)technology which has the advantages of high quality,low cost and compact layout.At the same time,the structure of the mixer,important device of HPMFD,was designed and the flow field was analyzed in order to improve the technical level of the existing descaling technology.Firstly,this paper summarized and analyzed the mechanism of the AWJ.Then selected the type of the abrasive nozzle,core components of the mixer,and designed the structure of the mixer through the job requirements and the experience formula.Secondly,the internal flow field of the abrasive nozzle was simulated by Fluent,then we obtain.And the effects of the operating conditions such as inlet pressure,abrasive particle size and abrasive concentration on the flow field inside the nozzle were studied.The effects of the structure parameters such as the aspect ratio of the nozzle cylinder and the contraction angle of the nozzle on the flow field inside the nozzle was studied too.After analysis we know the optimal aspect ratio was 6,and the optimal contraction angle was 30°.Finally,the liquid-gas flow field inside the whole mixer was simulated by Fluent,and the formation process of the jet flow was obtained.The solid-liquid-gas flow field inside the mixer was simulated too,and the turbulent kinetic energy distribution,velocity distribution and the movement of the abrasive were obtained.Then we study the effects of the structure parameters such as mixing chamber length,mixing chamber aspect ratio,abrasive inlet diameter,water jet inlet diameter,abrasive box outlet diameter on the flow field inside the mixer.After analysis we know the optimal mixing chamber length is 30 mm,the optimal mixing chamber aspect ratio is 2.2,the optimal abrasive inlet diameter is 1.4mm,the optimal water jet inlet diameter is 1.4mm,the optimal abrasive box outlet diameter is 1.2mm. |
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