| 紫外光诱导纳米颗粒胶体微射流碰撞特性（英文）北大核心CSCD |
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| 引用本文： | 宋孝宗,周有欣.紫外光诱导纳米颗粒胶体微射流碰撞特性（英文）北大核心CSCD[J].强激光与粒子束,2016,28(6):064118-101. |
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| 作者姓名： | 宋孝宗 周有欣 |
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| 作者单位： | 1.兰州理工大学 机电工程学院, 兰州 730050 |
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| 基金项目： | supported by National Natural Science Foundation of China；China Postdoctoral Science Foundation |
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| 摘 要： | 采用流体力学模拟方法,建立了垂直非淹没射流的计算流体动力学模型,研究了在紫外光诱导纳米颗粒胶体射流中用直径D为500μm的微孔光-液耦合喷嘴进行抛光加工的冲击动力学,分析了非淹没射流条件下光-液耦合喷嘴内、外的流场分布情况及其对工件表面的喷射冲击特征,对紫外光诱导纳米颗粒胶体射流冲击动力学过程进行了理论描述。计算结果表明,在1MPa入射压力时,微孔光-液耦合喷嘴口TiO2胶体的喷射速度约为30m/s,其集束匀速喷射距离约为5mm。在此喷射距离时进行垂直喷射,在胶束与工件表面的冲击射流作用区域,其射流静压最大值分布在射流冲击作用中心,但射流动压及射流合成速度在此区域的截面分布呈"W"形状,射流动压及速度最大值出现在胶体射流束的外环直径约2mm处。
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| 关 键 词： | 纳米颗粒胶体 非淹没射流 计算流体动力学 能量特征 |
| 收稿时间： | 2015-11-27 |
Impacting dynamics of ultraviolet induced nanoparticle colloid microjet |
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| Affiliation: | 1.School of Mechanical and Electronical Engineering,Lanzhou University of Technology,Lanzhou 730050,China |
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| Abstract: | In ultraviolet induced nanoparticle colloid jet machining, the nanoparticle colloid microjet is used to effectively remove the material of the workpiece surface. A computational fluid dynamic model for vertical non-submerged jet is established to investigate the impacting hydrodynamics in ultraviolet induced nanoparticle colloid jet machining using a micro hole light-liquid coupling nozzle with an outlet diameter of 500m. With this model, the energy characteristics of fluid field and pressure distributions in the process of ultraviolet induced nanoparticle colloid jet machining are computed under the condition of vertical injection. Through numerical investigation, the dynamic response of two-dimensional TiO2 nanoparticle colloid jet impacting on a plane surface is studied. The simulation results indicate that the injection velocity of the TiO2 colloid in the micro-liquid coupling nozzle is about 30m/s when the jet pressure is 1 MPa, and the uniform bundling jet distance is about 5 mm. The static pressure of the nanoparticle colloid jet in the core area is concentrated, therefore the dynamic pressure and the velocity distribution of the synthetic velocity in the area of the impact of the colloid impinging jet is W shaped, and the maximum value is at the 2 mm diameter of the colloid jet. |
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