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钝头体大迎角飞行时会出现随机的非对称流动现象,引起不确定的较大侧向力,进而使其偏离运行轨道。通过在钝头体头部施加人工扰动块可以固定其大迎角下的非对称流场结构,得到确定的侧向力,以利于改善钝头体的大迎角飞行特性及机动性。本文讨论了在头部人工扰动块主控流场结构的基础上,模型后体对侧向力影响的存在性问题,在迎角为50°、雷诺数为1.54×105的条件下,利用实验对周向角为90°和270°、子午角为10°的扰动位置的球形扰动主控下的侧向力影响因素进行了研究。发现钝头体大迎角下的非对称流动结构在头部主控的基础上,后体对非对称流动的影响不会消失,且其为影响头部扰动主控作用的重要因素。尽管模型后体的影响不会改变钝头体头部对于流场结构的主控地位,但会影响头部扰动控制的精准程度。所以在通过钝头体头部施加扰动进而得到确定的侧向力的同时,还需要减小模型后体对流场的影响,对其结构和加工质量进行优化,以更好地通过人工扰动主控流场结构。
A blunt body flying at a high angle of attack will appear random asymmetric flow phenomenon, causing a large lateral force of uncertainty, and thus make it deviate from the orbit. By applying artificial disturbance block to the head of the blunt body, the asymmetric flow field structure can be fixed under high angle of attack, and the determined lateral force can be obtained to improve the flight behavior and maneuverability of the bluff body at high angle of attack. In this paper, based on the structure of the head flow field of the head disturbance block, the influence of the posterior body model on the lateral force is discussed. Under the conditions of the attack angle of 50 ° and the Reynolds number of 1.54 × 105, The influencing factors of the lateral force under the main control of the spherical perturbation with the circumferential angles of 90 ° and 270 ° and the meridional angle of 10 ° were studied. It is found that the asymmetric flow structure at the high angle of attack of the bluff body does not disappear on the basis of the head control, and the influence of the body on the asymmetric flow will not disappear, and it is an important factor that affects the head control of the head disturbance. Although the influence of model body does not change the dominant position of blunt body head on flow field structure, it will affect the accuracy of head disturbance control. Therefore, it is also necessary to reduce the influence of the rear body of the model on the flow field while imparting perturbations to the head and to obtain the determined lateral force, so as to optimize the structure and processing quality so as to better control the flow through the main disturbances Control flow field structure.