(1. 北京有色金屬研究總院 國(guó)家有色金屬?gòu)?fù)合材料工程技術(shù)研究中心，北京 100088；
2. 北京康普錫威焊料有限公司，北京 100088)
摘 要: 利用計(jì)算流體動(dòng)力學(xué)Fluent軟件模擬導(dǎo)液管突出長(zhǎng)度對(duì)超音速氣霧化噴嘴氣體流場(chǎng)的影響以及對(duì)流場(chǎng)中心線上壓強(qiáng)、速度和溫度等的影響規(guī)律。結(jié)果表明：氣流場(chǎng)中存在一系列膨脹波及壓縮波，并隨著導(dǎo)液管突出長(zhǎng)度的增加，馬赫碟的強(qiáng)度逐漸增加；隨著突出長(zhǎng)度逐漸變大，抽吸壓力逐漸減小，成為負(fù)壓；滯點(diǎn)和馬赫碟的出現(xiàn)對(duì)氣流速度和溫度有較大的影響；導(dǎo)液管頂端徑向分布的靜壓強(qiáng)存在一個(gè)壓強(qiáng)梯度，并且隨著導(dǎo)液管突出長(zhǎng)度的增加而減小。
關(guān)鍵字: 氣霧化；導(dǎo)液管突出長(zhǎng)度；氣體流場(chǎng)；數(shù)值模擬
（1. National Engineering and Technological Research Center for Non-ferrous Metals Composites,
General Research Institute for Non-ferrous Metals, Beijing 100088, China;
2. Beijing COMPO Solder Co. Ltd., Beijing 100088, China）
Abstract: The effect of protrusion length of melt delivery tube on the gas flow field for supersonic gas atomization was analyzed numerically by using a computational fluid dynamics software Fluent. The influence of protrusion length on the static pressure, velocity magnitude and temperature of the central axis of the flow field was also examined. The results indicate that a series of expansion and compression waves are present in the flow field. With increasing protrusion length of melt delivery tube, the strength of Mach disk increases and the aspiration pressure decreases. The presence of stagnation point and Mach disk has a remarkable influence on the velocity and temperature of gas flow. A radical pressure gradient exists along the tip of the delivery tube and decreases with increasing protrusion length.
Key words: gas atomization; melt delivery tube protrusion length; gas field; numerical simulation
