Gasdynamics of an Internal-Mixing Nozzle for High-Temperature Liquid Metal

摘要

The powder was produced with the gas-assist atomization generally. The velocity of the atomization gas is achieved to sonic or supersonic velocity by the application of the C-D channel. A High-temperature Liquid Metal (HLM) nozzle is designed for the atomization of the high-temperature liquid metal. Water is free fall. It is fed near the throat of C-D channel. The atomization gas is confined by the C-D channel of HLM. The aspiration pressure of the liquid channel(Δp), the diameter of the liquid channel orifice(Φ), the pressure of the atomization gas (P{sub}(N2)) the distance(δ{sub}t) between the throat of C-D channel and the tip of the liquid channel, the flowrate of liquid (m{sub}L) and the flowrate of atomization gas (m{sub}(N2)) are examined. Result shows that the distance 5{sub}t must be controlled within the range -1mm ≤δ{sub}t ≤1mm. And, the aspiration pressure is affected less by Φ. The matters will be asked to pay attention for the melt atomization. Results also display that m{sub}(N2) increases as 8{sub}t decreases. However, it varies less as increases. It also be affected obviously by δ{sub}t as P{sub}(N2)<0.15Mpa but affected less as P{sub}(N2)>0.15Mpa.