|
|
Simulation of Gas Flow Field in Laval Nozzle and Straight Nozzle for Powder Metallurgy and Spray Forming |
LI Zheng��dong,ZHANG Guo��qing,LI Zhou,ZHANG Yong,XU Wen��yong |
National Key Laboratory of High Temperature Structural Materials, Beijing Institute of Aeronautical Materials, Beijing 100095, China |
|
|
Abstract Gas flow field in nozzles and out of nozzles was calculated for Laval orifice and straight orifice nozzles. The results showed that the flow generated by the Laval nozzle had a higher exit velocity in the vicinity of the nozzle, in comparison with that of the straight nozzle, that is to say, a Laval nozzle was more efficient than a straight one in disintegrating the melt stream and was apt to produce finer powders. The flow generated by the Laval nozzle was less convergent and the velocity gradient along the radial direction was more moderate than that of a straight nozzle, which could contribute to a broad distribution of melt particles. According to their flow characteristics, the Laval nozzle was reckoned as a better choice of producing larger spray��formed billets.
|
Received: 01 January 1900
|
|
|
|
[1] |
Da-shan Sui,*,Hai-ming Zhang,Hong-yang Zhu,Zhe Zhu,Zhen-shan Cui. Effects of process parameters on fragment and refinement of millimeter-grade coarse grains for 316LN steel during hot cogging[J]. Chinese Journal of Iron and Steel, 2017, 24(5): 529-535. |
[2] |
Zheng-wei GU,,Meng-meng L��,,Xin LI,,Hong XU,. Stretch Bending of Z-section Stainless Steel Profile[J]. Chinese Journal of Iron and Steel, 2016, 23(6): 525-530. |
[3] |
Cun-jiang TANG,Shi-long LIU,Cheng-jia SHANG. Micromechanical Behavior and Failure Mechanism of F/B Multi-phase High Performance Steel[J]. Chinese Journal of Iron and Steel, 2016, 23(5): 489-494. |
[4] |
Yang LI,,An-yuan DENG,,Chuan-qi YIN,,Sai-juan ZHANG,,En-gang WANG,. Effects of Magnetic Pressure Constraint on Dynamic Deformation and Oscillation Behavior of Metal Free Surface[J]. Chinese Journal of Iron and Steel, 2016, 23(11): 1134-1141. |
[5] |
Jian-an ZHOU, Kang WEI, Zhi-qiang LI , Zhong-qiu LIU , Xue-kai JIANG, Hong-wei NI. Numerical Simulation of Gas-powder Flow in a Slot-plug Mixing Chamber[J]. Chinese Journal of Iron and Steel, 2015, 22(Supplement 1): 24-29. |
[6] |
Peng-huan LI, Qiao-jun WU, Wen-hao HU, Jian-song YE. Mathematical Simulation of Behavior of Carbon and Oxygen in RH Decarburization[J]. Chinese Journal of Iron and Steel, 2015, 22(Supplement 1): 63-67. |
|
|
|
|