Title :
The study on oscillations of an opposing jet flow
Author :
Jin, Chengbin ; Wang, Zhenqing ; Lv, Hongqing ; Zhang, Cuie ; Wang, Yongjun
Author_Institution :
Coll. of Aerosp. & Civil Eng., Harbin Eng. Univ., Nantong
Abstract :
The oscillations of the flow field around a hemispherical nose with a supersonic opposing jet in a free stream of Mach 3.98 are computed. Two total pressure ratios of a jet to a free stream 0.2 and 0.6 are examined, which correspond to unsteady flow and steady flow, respectively. The axisymmetric Navier-Stokes equations with Shear-Stress Transport (SST) turbulence model are used as the governing equations in this paper. The oscillations of the flow field are reproduced, and mechanism of the oscillations is analyzed. Time-accurate algorithm is found to be necessary when an opposing jet flow field is solved, even for stable flow field. The time-averaged density distribution obtained in this paper is in good agreement with schlieren photograph. Also, the wall heat flux predicted in this paper is in agreement with experimental result.
Keywords :
Navier-Stokes equations; fluid oscillations; jets; shear turbulence; transport processes; Navier-Stokes equations; flow field; hemispherical nose; opposing jet flow; oscillations; schlieren photograph; shear-stress transport turbulence model; time-averaged density distribution; wall heat flux; Aerodynamics; Aerospace engineering; Civil engineering; Educational institutions; Electric shock; Navier-Stokes equations; Nose; Protection; Space heating; Space vehicles;
Conference_Titel :
Systems and Control in Aerospace and Astronautics, 2008. ISSCAA 2008. 2nd International Symposium on
Conference_Location :
Shenzhen
Print_ISBN :
978-1-4244-3908-9
Electronic_ISBN :
978-1-4244-2386-6
DOI :
10.1109/ISSCAA.2008.4776290
