Drag and overall aeroheating reduction of a dual-disk-dual-jet in rarefied hypersonic flow in near space

Based on the direct simulation Monte Carlo method (DSMC), this paper studies the near-space hypersonic rarefied flowfield around the dual-disk with and without jet. The research extends the dual-disk-dual-jet configuration to near space and finds that only increasing the number of disks will no longer be a good solution for reducing drag in hypersonic rarefied flow. The study proposes a comprehensive evaluation of blunt body and forebody shock control devices for aeroheating reduction. A key finding is that an opposing jet on the first disk is crucial for the aeroheating protection of the spike-disk itself, while eliminating or weakening stagnation points on disks. The research further demonstrates that allocating the fixed jet mass flow rate to the opposing and lateral jet is an optimal strategy in hypersonic rarefied flow. This paper also shows that the jet only needs a lower mass flow rate in rarefied flow. This study investigates the performance of a dual-disk-dual-jet model in hypersonic rarefied flow in near space. Compared to the dual-disk without jet (base model), in the studied parameter range, when the pressure ratio is 0.08, the total mass flow rate of the jet is 0.0427kg/s, the drag and aeroheating reduction of the blunt body in the dual-disk-dual-jet model are reduced by 64.3 % and 86.8 %, respectively.