Dengke LI, Bo SUN, Chunliang DAI, Xiong CHEN
DOI Number: XXX-YYY-ZZZ
Conference number: HiSST 2024-0087
To understand the effects caused by the different aft angles on non-equilibrium flows over double cone, high enthalpy (21.77MJ/kg) flows over double cones with aft angles of 45°,50°,55° and 60° are numerically investigated in the present work. Considering the non-equilibrium effects, the Naiver-Stokes equations coupled with two-temperature model and a seven-species chemical kinetic model are employed to simulate the flow. The enhanced aft angle and the change in shock structures lead to a higher adverse pressure gradient at the vicinity of compressed corner, such that the separation zone extends along both upstream and downstream. In flows of double cone with 45° and 50° aft angle, the shock-shock interactions are close to the Edney type-VI interaction. Whereas, Edney type-IV interaction and secondary separation vortex appear in flow fields of double cone with 55° and 60° aft angle. As the aft angle increases, the dissociation reactions of the molecules enhance, besides, the translational-rotational temperature just behind the second cone shock goes up. The increase of aft angle changes the distribution of wall parameters, which are evidenced by a higher peak of wall pressure and wall heat flux in the vicinity of the reflected shock. Furthermore, more pressure and heat peaks can be observed at the second cone surface. Overall, a larger aft angle increases the thermal loads on the second cone while decreases the thermal loads of the first cone.