液态金属超声雾化喷嘴的气雾化性能影响因素
发布时间：2018-08-05 12:03
【摘要】：采用Fluent软件建立超声雾化喷嘴气流场的数值模拟模型,研究入口压力、导液管孔径与伸出长度对超声雾化喷嘴气雾化性能的影响,并采用超声雾化法制备GCr15轴承钢粉末,验证入口压力对粉末粒度的影响。结果表明:导液管伸出长度Δh=1 mm时,入口压力越大,越有利于提高雾化效果;在Δh=2 mm或Δh=3 mm条件下,当入口压力小于2.0 MPa时,增大入口压力可有效提高雾化性能,而当入口压力超过2.0 MPa后,增大入口压力对提高雾化性能效果有限。导液管的孔径对气流场结构影响较小,主要通过影响金属液的质量流率来影响雾化效果。雾化实验结果表明,在Δh=1 mm、导液管孔径d=4.5 mm时,2.8 MPa入口压力下的雾化性能优于2.0 MPa与1.2 MPa下的雾化性能,获得的GCr15轴承钢粉末平均粒径最小,整体球形度最佳,该实验结果与数值模拟研究结果一致。
[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.
【作者单位】： 上海交通大学模具CAD国家工程研究中心;
【基金】：国家科技重大专项资助项目(2012ZX04012011)
【分类号】：TF123.112
，
本文编号：2165739
[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.
【作者单位】： 上海交通大学模具CAD国家工程研究中心;
【基金】：国家科技重大专项资助项目(2012ZX04012011)
【分类号】：TF123.112
，
本文编号：2165739
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