扩压式双S隐身进气道设计和流场分析  

Investigation on the Design and Flow Characteristics of Diffusing Double-S Inlets

作　　者：李建华[1] 包晓翔[1] 刘凯[1] 李锋[1] 

机构地区：[1]中国航天空气动力技术研究院彩虹无人机科技有限公司,北京100074

出　　处：《航空工程进展》2017年第2期219-225,共7页Advances in Aeronautical Science and Engineering

摘　　要：采用扩压式双S隐身进气道能够提高飞行器的隐身特性和综合性能。针对保形短程、高隐身、大偏距的亚音速隐身无人机进气道,以保形入口、中间控制面和出口截面为约束并结合多项式对中心线和面积、截面形状进行控制,实现对保形进口截面形状和弯曲形式复杂的双S隐身进气道的快速设计;在此基础上,研究中心线曲率、面积分布和中间截面形状等参数对进气道性能的影响。结果表明:双S进气道流场特性复杂,第二S弯处顶部的分离和空间二次涡引发的流场畸变的综合控制是设计的重点,通过截面参数约束并结合多项式能够对双S进气道内的流场品质进行控制;在中心线曲率、扩张角和多项式参数等配制上应该朝利于第二S弯流场稳定的方向靠近。Diffusing double-S inlets are of particular interest in the aircraft design due to their ability of reducing the radar signature and drag. Surface composition of the compact and offset bend douhle-S inlet can he quickly accomplished with a polynomial central line, along with complex conformal intake, midsection and outlet shape. Six ducts are created and multi-parameters which include centerline curvature, area ratio and middle-cross-sec- tional shape are analyzed utilizing that method to study their effects on duct performance. Results indicate the approach of a polynomial central line and cross-sectional shape is effective in the double-S inlet design and that there are more complex flow structures in the double-S inlet compared with that in the S-duct inlet. Great emphasis should be placed on the control to the flow separation lying about the second S-bend and flow distortion arose by eddy, those parameters of central line curvature, expansion angle and polynomial should be chosen to beneficial the flow stability of the second S-bend.

关 键 词：双S进气道 短程扩压 总压恢复系数 畸变指数 

分 类 号：V211.3[航空宇航科学与技术—航空宇航推进理论与工程]