TY - JOUR
T1 - Inhomogeneous behavior of supercritical hydrocarbon fuel flow in a regenerative cooling channel for a scramjet engine
AU - Sun, Feng
AU - Li, Xin
AU - Boetcher, Sandra K.S.
AU - Xie, Gongnan
N1 - Publisher Copyright:
© 2021 Elsevier Masson SAS
PY - 2021/10
Y1 - 2021/10
N2 - Supercritical hydrocarbon fuel is employed to simultaneously cool associated combustors and to recover heat. Aiming to improve the thermal performance of the regenerative cooling channels in an advanced aircraft, the flow behavior, vortex structures, and transport characteristics of supercritical n-decane are investigated using an LES model. The flow patterns are identified by several common buoyancy criteria, and oscillation effects are observed in strongly mixed flows. Using temperature and density gradient fields, distinct inhomogeneity shows that the thermal oscillations aggravate the further occurrence of uneven performance. Furthermore, the positive helicity gradually increases with the accumulation of buoyancy force. The notably strong vorticity mainly concentrates near the heated wall, while a narrow section appears in the turbulent region, which indicates that the variable vorticity behavior contributes to the transport properties.
AB - Supercritical hydrocarbon fuel is employed to simultaneously cool associated combustors and to recover heat. Aiming to improve the thermal performance of the regenerative cooling channels in an advanced aircraft, the flow behavior, vortex structures, and transport characteristics of supercritical n-decane are investigated using an LES model. The flow patterns are identified by several common buoyancy criteria, and oscillation effects are observed in strongly mixed flows. Using temperature and density gradient fields, distinct inhomogeneity shows that the thermal oscillations aggravate the further occurrence of uneven performance. Furthermore, the positive helicity gradually increases with the accumulation of buoyancy force. The notably strong vorticity mainly concentrates near the heated wall, while a narrow section appears in the turbulent region, which indicates that the variable vorticity behavior contributes to the transport properties.
KW - Inhomogeneity
KW - LES
KW - Mixed convection
KW - Supercritical fluids
KW - Thermal oscillations
KW - Vorticity
UR - http://www.scopus.com/inward/record.url?scp=85108366349&partnerID=8YFLogxK
U2 - 10.1016/j.ast.2021.106901
DO - 10.1016/j.ast.2021.106901
M3 - 文章
AN - SCOPUS:85108366349
SN - 1270-9638
VL - 117
JO - Aerospace Science and Technology
JF - Aerospace Science and Technology
M1 - 106901
ER -