Characteristics of hypersonic inward turning detonation wave

The selection of an appropriate basic detonation wave flow field is crucial for improving the performance and geometric design of standing detonation vehicles. This paper employs a detailed chemical reaction model and solves the unsteady axisymmetric Euler equation to study the characteristics of the Axisymmetric Inward Turning Curved Detonation Wave (AIT-CDW) flow field and the parameters affecting the stability of the wave system structure of AIT-CDW flow field. The numerical results demonstrate a radial compression effect in the AIT-CDW flow field. This effect causes the detonation wave to have a shorter initiation length than oblique detonation wave flow field and the detonation wave angle to gradually increase with the flow direction post-detonation. The AIT-CDW flow field is confined space, making it prone to normal detonation waves when the detonation wave reflects from the wall. This phenomenon is detrimental to the stability of the wave system structure in the flow field. It has been observed that increasing the center body radius and decreasing the fuel equivalent ratio can effectively reduce the height of the normal detonation wave or even eliminate it. Additionally, a well-designed generatrix shape of the center body can enhance airflow, reduce choked flow, and promote the stability of the wave structure in the flow field.