摘要
从超声速气动原理出发,结合流线追踪和几何重构技术,提出了一种前后缘同时可控的乘波体气动修型设计方法。在前缘水平投影为超椭圆和后缘为圆弧的条件下,采用该方法完成了乘波体的气动修型设计并在设计点(Ma=6.0)和接力点(Ma=4.0)开展数值仿真研究。结果表明:在前后缘同时指定的条件下,气动修型设计的乘波体型面过渡光滑,只在出口两侧有很小的高压区,可以很好地保持基准乘波体的波系结构和乘波特性。与基准乘波体相比,气动修型的乘波体具有更高的容积率、升力和预压缩效率,俯仰力矩几乎相等,但是升阻比下降。有粘条件下,设计点时升阻比由2.91降为2.53,接力点时由2.69降为2.32。上述结果符合设计预期,设计方法可行。
Based on the supersonic aerodynamic principle combined with the streamline tracing and geometric reconstruction technique, a design method of waverider with controlled the leading and trailing edge was developed in this paper. Under the conditions that the horizontal projection of leading edge is hyper elliptical and the trailing edge is circular, the aerodynamic modification waverider was designed by using this method. Numerical simulation results at design point （Ma = 6.0） and relay point （Ma = 4. O） indicate that the surface of aerodynamic modification waverider is of smooth transition while the leading and tailing edge are specified simultaneously, except a very small high pressure area at both sides of the exit. Therefore, it is able to maintain the wave structure and characteristics of original waverider. Com- pared with the original waverider, the volume ratio, life force and pre-compression efficiency of aerody- namic modification waverider are higher. In addition, the pitching moment is almost equal but the lift -drag ratio is decreased. Under the viscous condition, the lift-drag ratio decreases from 2.91 to 2.53 at design point and decreases from 2.69 to 2.32 at relay point. The above results correspond to the design expectation, and the design method is feasible.
作者
李永洲
李光熙
张堃元
马元
LI Yongzhou;LI Guangxi;ZHANG Kunyuan;MA Yuan(Xi＇ an Aerospace Propulsion Institute, Xi＇ an 710100, China;College of Energy and Power Engineering,Nanjing University of Aeronautics and Astronautics,Nanjing 210016,China)
出处
《火箭推进》
CAS
2018年第2期1-9,38,共10页
Journal of Rocket Propulsion
基金
国家自然科学基金(11702205)
关键词
乘波体
气动修型
流线追踪
几何重构
投影形状
waverider
aerodynamic modification
streamline tracing
geometric reconstruction
pro- jection shape
