1. 北京航空航天大学 交通科学与工程学院,北京,100191
2. 飞机/发动机综合系统安全北京市重点实验室,北京,100191
李峰梅(1991-), 女, 河南洛阳人, 硕士研究生, 研究方向:发动机防冰.E-mail:13243183520@163.com
柯鹏(1979-), 男, 湖北孝感人, 副教授, 研究方向:飞机/发动机防除冰与适航技术.E-mail:p.ke@buaa.edu.cn
纸质出版:2019
移动端阅览
李峰梅, 柯鹏. 双孔射流对圆柱表面水滴撞击特性影响的数值分析[J]. 空气动力学学报, 2019, 37(6): 990-997.
LI Fengmei, KE Peng. Numerical investigation on the influence of air jet on droplets impact on 3D holed cylinder[J]. 2019, 37(6): 990-997.
李峰梅, 柯鹏. 双孔射流对圆柱表面水滴撞击特性影响的数值分析[J]. 空气动力学学报, 2019, 37(6): 990-997. DOI: 10.7638/kqdlxxb-2018.0022.
LI Fengmei, KE Peng. Numerical investigation on the influence of air jet on droplets impact on 3D holed cylinder[J]. 2019, 37(6): 990-997. DOI: 10.7638/kqdlxxb-2018.0022.
对于低导热系数复合材料制作的发动机进气部件防冰问题,冲击-热气膜复合防冰技术应用前景较好,但是射流对水滴撞击影响的还缺少研究。本文以三维开双孔圆柱为对象,采用基于欧拉-欧拉框架的三维水滴撞击数值模拟方法,分析了双孔射流对水滴撞击特性的影响。研究发现,由于开孔射流与主流之间的强耦合,射流对来流水滴存在吹袭和扩散等不同作用机制,影响规律与射流强度和物面位置密切相关。针对典型水滴直径(20 μm)和来流速度(30 m/s)的工况,取沿展向六个截面及孔间中心截面的水滴运动轨迹和涡量场进行了分析。在小吹风比(0.5和1.0)时,射流影响仅限于展向近孔截面,孔间水滴撞击系数相比于无气膜工况最大降幅为7.51%。吹风比为1.5时,射流吹袭和扩散作用更强烈,孔间水滴沿展向被吹向外侧,造成近孔截面水滴量减少而远孔截面增加,孔间截面水滴撞击系数比无气膜工况最大降幅为8.95%,水滴撞击系数由展向外侧向孔间的最大降幅约17.65%。研究初步揭示了射流气膜对圆柱表面来流水滴撞击特性的影响规律和形成原因,为后续冲击-热气膜复合防冰系统的设计提供参考。
For the anti-icing problem of the engine air induction part with low thermal conductivity composite material
the combined heat transfer method using impingement and jet air film has promising application
while there is still a lack of systematic studies of the effects of jet air film on the water droplets impingement. The numerical simulation algorithm of three dimensional water droplet impingement based on Eulerian- Eulerian method was developed and verified by experimental data from references
where the convergence of algorithm was improved with the diffusion coefficient. The droplets impingement characteristics of the three dimensional cylinder with two parallel jet holes under three different blowing ratios (0.5
1.0
and 1.5) were then studied. It is found that
the strong coupling between the jet air film and the main stream leads to different mechanisms of blowing off and diffusion between the jet air film and water droplets
which are closely related to the jet intensity and position. For typical droplet diameters (20 μm) with certain velocity (30 m/s)
the trajectory and vorticity field of water droplets at six spanwise cross-sections and one center section cross the holes were analyzed. At small blowing ratios (0.5 and 1.0)
the jet air film effect is limited to spanwise near-hole cross-sections
and the impingement coefficient of water droplets between holes is reduced by a maximum of 7.51% compared with that without air film. When the blowing ratio is increased to 1.5
the effect of jet blowing off and diffusion is stronger
and the water droplets between holes are blown outward along the extension direction
resulting in the decrease of the water droplets in the near hole section and the increase of that in the far hole section. The water droplets impingement coefficient of the cross-section between holes is reduced by a maximum of 8.95% compared with that without air film
and the water droplets impingement coefficient is reduced by a maximum of 17.65% from extending outward to between holes. In this paper
the effects and its inner mechanisms of hot jet film on the droplet impingement characteristics were analyzed
which provides a reference for the design of the hot air film anti-icing system.
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