摘要
基于CFD数值模拟技术,对超紧凑S弯收扩喷管的流动机理进行了研究,并针对流场中出现的流动分离现象,采取吸气的流动控制方法并详细分析了吸气位置、角度及压比对控制效果的影响。结果表明:在喷管第一弯上壁面及第二弯下壁面附近存在局部加速区域;在喉部法向截面上存在横向涡,第一弯后出现流动分离,形成分离区;在分离区前做吸气控制时,能基本吸除分离区,该位置吸气比为3、吸气角度为45°吸气时控制效果最好,总压恢复系数和推力系数相对原型分别提高约1.08%和3.71%。
Based on the CFD numerical simulation, the flow mechanism of the ultra-compact serpentine convergent-divergent nozzle was studied. According to the phenomenon of flow separation in the flow field, the flow control method of suction technology was adopted and the effect caused by the changing of the location of the installation, the angle of suction jet and the pressure ratio of suction were analyzed in detail. The computational results showed that the local acceleration zones existed near the upper wall of the first turning and the down wall of the second turning. There is a pair of vortex in the cross section of the throat, and the flow separation occurs after the first turning which lead to a separation zone. The separation zone basically disappeared when sucked before the separation point, the total pressure recovery coefficient and thrust coefficient increased about 1.08% and 3.71% respectively in comparison with the prototype when sucking before the separation point with sucking ratio of 3 and sucking angle of 45° leading to the best control effect.
作者
王占学
俞梦哲
史经纬
周莉
孙啸林
WANG Zhan-Xue ,YU Meng-Zhe ,SHI Jing-Wei ,ZHOU Li ,SUN Xiao-Lin(Northwest Polytechanic University, Xi＇an 710072, Chin)
出处
《工程热物理学报》
EI
CAS
CSCD
北大核心
2018年第8期1718-1724,共7页
Journal of Engineering Thermophysics
基金
国家自然科学基金(No.51576163)
中央高校基本科研业务费专项基金(No.3102017zy009)
关键词
S弯喷管
流动机理
流动分离
吸气控制
serpentine nozzle
flow mechanism
flow separation
sucking control
