首页|Analysis of inner flow and outflow characteristics of different scramjet elliptical holes
Analysis of inner flow and outflow characteristics of different scramjet elliptical holes
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NETL
NSTL
Taylor & Francis
The elliptical hole has the potential to promote jet breakup and improveatomization and mixing quality. The flow behavior in the nozzle and theoutflow characteristics have an important influence on the atomization andmixing process of the downstream fuel. Therefore, the inner cavitation flowprocesses and outflow characteristics for elliptical holes for scramjet engineat injection pressures of 3 MPa and 5 MPa were investigated using theVolume of Fluid (VOF) method and Large Eddy Simulation (LES). The numericalfindings demonstrated that the cavitation region and vortex structures ofelliptical holes mainly appeared on the long axial plane. The cavitationintensity of elliptical holes was weaker than that of the circular hole.Compared with the circular hole, the gas phase volume fraction of ellipticalhole with the aspect ratio of 4 was reduced by about 22.1 and 21.1%respectively under 3MPa and 5MPa injection pressure. The application ofelliptical holes inhibited the generation of cavitation and had large mass flowrate and flow coefficient. The mass flow rate of the elliptical hole with theaspect ratio of 4 was the largest, and the mass flow rate increased by about5.1% compared with that of the circular hole. Elliptical holes showeda smaller velocity coefficient and a larger area coefficient when cavitationexisted. The elliptical hole with the aspect ratio of 4 held the smallest velocitycoefficient and largest area coefficient, with the difference of 12.1% and18.9% respectively from the circular hole. Another important point wasthat elliptical holes enhanced the turbulent disturbance at the hole outlet,which facilitated the breakup of downstream jet.
NETL
NSTL
Taylor & Francis
