TY - JOUR
T1 - Effect of parallel-jet addition on the shock train characteristics in a central-strut isolator by detached eddy simulation
AU - Xue, Rui
AU - Wei, Xianggeng
AU - He, Guoqiang
AU - Hu, Chunbo
AU - Tang, Xiang
N1 - Publisher Copyright:
© 2017 Elsevier Ltd
PY - 2017
Y1 - 2017
N2 - For the Rocket-Based Combined-Cycle (RBCC) engine, the addition of primary rocket jets makes both the flow field and the shock train structure more complicated. In this study, a three-dimensional Detached Eddy Simulation (DES) modeling was employed for the numerical analysis of a full-scale central-strut isolator. The characteristics of shock train for the flight Mach 3 were studied. As a result, under the effect of central high-velocity central jets and different back pressures, the structure of shock train could be changed. At the low back pressure, the expansion wave originated from the trailing edge of the central strut still existed, and one X-type shock wave was formed at downstream. Then the strength of the subsequent shock waves between the parallel-jets and the wall in shock train gradually decays. As the back pressure increased, the leading edge of the shock train moved upstream. The shock train was then transformed into two parts: one part was the oblique shock wave generated in the strut section; another was the quasi-normal shock waves formed in the mixing section within the region between the shear layer and the parallel jets. The origination of the first shock wave could cause the generation of the vortexes in the isolator. With the parallel-jet addition, as the vortexes were transported downstream, they broke up into small scales and in more random orientation at the back wall of the central-strut.
AB - For the Rocket-Based Combined-Cycle (RBCC) engine, the addition of primary rocket jets makes both the flow field and the shock train structure more complicated. In this study, a three-dimensional Detached Eddy Simulation (DES) modeling was employed for the numerical analysis of a full-scale central-strut isolator. The characteristics of shock train for the flight Mach 3 were studied. As a result, under the effect of central high-velocity central jets and different back pressures, the structure of shock train could be changed. At the low back pressure, the expansion wave originated from the trailing edge of the central strut still existed, and one X-type shock wave was formed at downstream. Then the strength of the subsequent shock waves between the parallel-jets and the wall in shock train gradually decays. As the back pressure increased, the leading edge of the shock train moved upstream. The shock train was then transformed into two parts: one part was the oblique shock wave generated in the strut section; another was the quasi-normal shock waves formed in the mixing section within the region between the shear layer and the parallel jets. The origination of the first shock wave could cause the generation of the vortexes in the isolator. With the parallel-jet addition, as the vortexes were transported downstream, they broke up into small scales and in more random orientation at the back wall of the central-strut.
KW - Boundary layer
KW - Central-strut isolator
KW - Primary jet addition
KW - Shock train
UR - http://www.scopus.com/inward/record.url?scp=85023159244&partnerID=8YFLogxK
U2 - 10.1016/j.ijheatmasstransfer.2017.06.074
DO - 10.1016/j.ijheatmasstransfer.2017.06.074
M3 - 文章
AN - SCOPUS:85023159244
SN - 0017-9310
VL - 114
SP - 1159
EP - 1168
JO - International Journal of Heat and Mass Transfer
JF - International Journal of Heat and Mass Transfer
ER -