Establishment process of spiked lateral jet in hypersonic flows

For drag and heat flux reduction, many strategies equipped with jets have got lots of attentions recently. However, the establishment process of jet flow still remains unclear. In this investigation, an in-house code was developed to simulate the establishment process of spiked lateral jet flow and to uncover flow mechanisms. Firstly, code verification and validation were performed. Then the establishment process of spiked lateral jet in hypersonic flows is thoroughly investigated. Besides, some factors influencing the establishment process of spiked lateral jet are also explored. The results showed that the establishment process of spiked lateral jet in hypersonic flows is a strong transient process and contains complex flow phenomena. During the whole process, the aerodynamic drag firstly drops and then rises accompanying by fluctuation to a stable value. Increasing the lateral jet pressure would lead to severer interaction between the lateral jet and blunt body resulting in more dramatic fluctuation of aerodynamic drag. Besides, for fixed lateral jet pressure, longer spike is recommended. The transient flow structure is highly dominated by the lateral jet location and proper lateral jet location can decrease the fluctuation of aerodynamic drag during the establishment process of spiked lateral jet in hypersonic flows.