侧向多喷流流场数值研究

Analysis of interaction flowfields of multiple lateral jets

为研究侧向喷流对高超声速拦截弹喷流直接力控制性能的影响,发展了在有限体积离散方法框架下的三维非定常N-S方程,采用LU-SSOR隐式时间推进格式和残值项空间迎风型格式求解技术,对大气层内高超声速拦截弹多个姿态控制喷流发动机同时工作时的干扰流场进行了数值求解。计算给出了自由流与侧喷流、侧喷流与侧喷流之间复杂干扰流场结构图(等压云图、等马赫云图)以及喷流附近的压强分布,其结果与单一侧向喷流流场情况进行了比较和分析。结果显示,喷流前的压强场基本不受后喷流的影响,处于前喷流尾流区后的喷流的干扰效率将受到较大影响。

In order to study the effect of lateral jets on direct force control performance of hypersonic interceptor missile, computational technique of Reynolds-averaged Navier-Stokes equations discretized under cell-centered finite volume framewoks, using an implicit scheme which is the lower-upper symmetric successie over-relaxation (LU-SSOR) scheme in time discretion and upwind schemes in spatial discretions a detailed numerical investigation of the interaction between jets and the external flow was processed for the endo-aerosphere interceptor missile with multiple-jet. And detailed flow visualization studies highlight of the complex nature of the three dimensional interaction phenomena were obtained and provided insight into the physics of the flow structure. The results show that the interaction phenomena of multiple lateral jets induced the flowfield are significant different from that of a jet alone, and the pressure field before the ahead jet is not affected by after jet and the interaction efficiency of the after jet in the wake of ahead jet will be affected by the ahead jet.