小支板后不同喷孔形状射流的气动特性  

Aerodynamic Characteristics of Pylon-aided Fuel Injection with Various Port Shapes in a Supersonic Flow Field

作　　者：李旭昌[1] 王应洋 张成涛[1] 

机构地区：[1]空军工程大学防空反导学院,西安710051

出　　处：《空军工程大学学报（自然科学版）》2016年第2期5-9,共5页Journal of Air Force Engineering University(Natural Science Edition)

基　　金：航空科学基金(20130196004)

摘　　要：针对带有小支板后低动压喷注的超声速流场进行数值模拟,分析了有无小支板时6种不同喷孔形状的流场特性。研究结果表明:小支板能显著提高后方不同喷孔横向射流的穿透深度、促进燃料与来流掺混并且不会导致较大的总压损失;小支板与方孔、圆孔和三角形喷孔组合时流场特性差异并不大,与长宽比为10:1的喷孔和菱形孔组合混合效率提升得较为显著;大长宽比喷孔能使射流充分利用小支板后缘的低压区与强湍流区,从而发挥出比无小支板时更为优越的掺混特性;通过研究进一步认识了小支板后低动压喷注的流场特性,为优化喷射装置提供了依据。The numerical simulation is carried out to investigate the cold fluid field characteristics of small pylon-aided gaseous fuel injection with six different port shapes in the supersonic combustion. The result shows that pylon can raise mixing efficiency and fuel penetration height without big total pressure loss. The pylons combined with square, circular and triangle port nearly have the same flow characteristics, but with diamond port and jet of rectangle 10 ： 1 can get remarkable mixing enhancement. A high aspect ratio injector can get the advantages of low pressure and high vertical magnitude depression behind the pylon, which is much better than the no pylon cases. Through the investigation, a better understanding of the characteristics of flow field with pylon-aided fuel injection is made, and the investigation supplies optimization of injector with basis.

关 键 词：超燃燃烧室 小支板 横向射流 掺混增强 数值模拟 

分 类 号：V235[航空宇航科学与技术—航空宇航推进理论与工程]