In:
Physics of Fluids, AIP Publishing, Vol. 31, No. 8 ( 2019-08-01)
Abstract:
The three-dimensional flow on a plate with a V-shaped blunt leading edge (VsBLEP) is investigated numerically and experimentally at a freestream Mach number 6. A complex saddle-shaped shock front is observed on this VsBLEP under the interactions between the detached shock (DS) induced by the swept blunt leading edge and the bow shock (BS) induced by the crotch. It is demonstrated that a new type of spatial transition exists on this saddle-shaped shock front, which involves the transition of shock interactions (i.e., DS and BS) from the same family upstream of the crotch to opposite families downstream of the crotch. Moreover, this transition is quantitatively identified according to the shock-induced spanwise velocity along the inflection line between DS and BS, which is of great importance because it affects the crossflow significantly. The inward crossflow induced by the swept blunt leading edge is enhanced in the region where the DS and BS are from the same family, and the shear layers generated in this region converge gradually to the spanwise symmetry plane, which results in the formation of a streamwise counter-rotating vortex pair (CVP). In the region where the DS and BS turn to opposite families, the inward crossflow is eliminated, and a five-shock structure is identified downstream of the crotch. The CVP remains close to the spanwise symmetry plane as it trails downstream, showing a far-reaching influence on the flowfield. This study indicates that the V-shaped blunt leading edge affects the downstream flow significantly and therefore should be examined carefully in practical applications, such as in the design of an inlet cowl lip.
Type of Medium:
Online Resource
ISSN:
1070-6631
,
1089-7666
Language:
English
Publisher:
AIP Publishing
Publication Date:
2019
detail.hit.zdb_id:
1472743-2
detail.hit.zdb_id:
241528-8
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