發(fā)布時(shí)間：2018-08-05 12:03

【摘要】：采用Fluent軟件建立超聲霧化噴嘴氣流場(chǎng)的數(shù)值模擬模型,研究入口壓力、導(dǎo)液管孔徑與伸出長(zhǎng)度對(duì)超聲霧化噴嘴氣霧化性能的影響,并采用超聲霧化法制備GCr15軸承鋼粉末,驗(yàn)證入口壓力對(duì)粉末粒度的影響。結(jié)果表明:導(dǎo)液管伸出長(zhǎng)度Δh=1 mm時(shí),入口壓力越大,越有利于提高霧化效果;在Δh=2 mm或Δh=3 mm條件下,當(dāng)入口壓力小于2.0 MPa時(shí),增大入口壓力可有效提高霧化性能,而當(dāng)入口壓力超過2.0 MPa后,增大入口壓力對(duì)提高霧化性能效果有限。導(dǎo)液管的孔徑對(duì)氣流場(chǎng)結(jié)構(gòu)影響較小,主要通過影響金屬液的質(zhì)量流率來影響霧化效果。霧化實(shí)驗(yàn)結(jié)果表明,在Δh=1 mm、導(dǎo)液管孔徑d=4.5 mm時(shí),2.8 MPa入口壓力下的霧化性能優(yōu)于2.0 MPa與1.2 MPa下的霧化性能,獲得的GCr15軸承鋼粉末平均粒徑最小,整體球形度最佳,該實(shí)驗(yàn)結(jié)果與數(shù)值模擬研究結(jié)果一致。
[Abstract]:The numerical simulation model of air flow field of ultrasonic atomizing nozzle was established by using Fluent software. The influence of inlet pressure, nozzle aperture and extension length on the atomization performance of ultrasonic atomizing nozzle was studied. The GCr15 bearing steel powder was prepared by ultrasonic atomization method. The effect of inlet pressure on particle size was verified. The results show that the higher the inlet pressure is, the better the atomization effect is, and when the inlet pressure is less than 2.0 MPa, the atomization performance can be improved when the inlet pressure is less than 2.0 MPa. However, when the inlet pressure exceeds 2.0 MPa, the effect of increasing the inlet pressure on the atomization performance is limited. The pore diameter of the liquid conducting tube has little effect on the structure of the airflow field, and the atomization effect is mainly affected by the influence of the mass flow rate of the liquid metal. The results of atomization test show that the atomization performance at the inlet pressure of 2.8 MPa is better than that at 2.0 MPa and 1.2 MPa at the inlet pressure of 2.8 MPa when the diameter of the guide tube is 4.5 mm. The results show that the average particle size of the GCr15 bearing steel is the smallest, and the globality of the steel is the best. The experimental results are in agreement with the numerical simulation results.
【作者單位】： 上海交通大學(xué)模具CAD國(guó)家工程研究中心;
【基金】：國(guó)家科技重大專項(xiàng)資助項(xiàng)目(2012ZX04012011)
【分類號(hào)】：TF123.112
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本文編號(hào)：2165739