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文章基于一种简易“浸入边界技术”与流固耦合方法对超声速来流条件下的三维降落伞系统进行了数值模拟。研究中,降落伞系统包括前体和伞体,两者通过伞绳连接。文章的研究目的是分析不同攻角下降落伞伞绳对于降落伞系统周围复杂非定常流场的影响,以及对降落伞性能表现的影响。结果表明:在较小的前体和伞体距离下,由于攻角的影响,非定常流场结构呈现上下不对称,并且上下伞绳激波形成时间不同步。随着攻角的增加,上下面的伞绳激波形成时间出现推迟,并且有变弱的趋势。另外,由于攻角与伞绳的综合影响,伞内表面的时间平均压力分布在5o攻角时最小,而在10o攻角时最大,阻力系数却随着攻角的增加而增加。
Based on a simple “immersion boundary technique” and fluid-solid coupling method, the numerical simulation of three-dimensional parachute system under supersonic flow conditions was carried out. In the study, the parachute system consisted of a precursor and an umbrella, both connected by an umbrella. The purpose of this paper is to analyze the influence of parachute ropes at different angles of attack on the complex unsteady flow field around the parachute system and its impact on performance of the parachute. The results show that the structure of unsteady flow field is asymmetric up and down due to the angle of attack under the condition of smaller distance between the precursor and the parachute, and the formation time of the upper and lower parachute rope is not synchronous. As the angle of attack increases, the formation time of the upper and lower parachute shocks appears to be delayed and tends to be weaker. In addition, due to the combined effect of angle of attack and the rope, the time-averaged pressure distribution on the inner surface of the umbrella is the smallest at the angle of 5o, while the maximum at the angle of 10o. The drag coefficient increases with the angle of attack.