Under flight conditions, the instability of the Mack mode will be significantly enhanced since the ratio of the wall temperature to the freestream temperature is usually low. Therefore, the boundary layer over the windward side dominated by the Mack mode may transit to turbulence earlier than the lateral side. In this paper, a high-resolution direct numerical simulation is used to study the evolution of the Mack mode on the windward side of a hypersonic inclined cone under a flight condition. The Mack mode is excited by a short-time localized wall-normal blowing-suction around the windward centerline. The spatial distribution of wavepackets and the axial evolution of the amplitudes of representative modes show that for an inclined cone, the evolution of the Mack mode is similar to that in the boundary layer over a zero-angle-of-attack cone, i.e., fundamental resonance is the most likely transition routine of the Mack mode.
YANG Peng
,
TANG Zhigong
,
CHEN Jianqiang
,
YUAN Xianxu
,
CHEN Xi
,
DONG Siwei
. Temporal evolution of wavepackets on the windward side of an inclined hypersonic cone under a flight condition[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2021
, 42(S1)
: 726367
-726367
.
DOI: 10.7527/S1000-6893.2021.26367
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