Abstract There exist two distinct modes of flow instability, namely pulsation and oscillation, related to the flat-ended cylinder with pointed spike in high-speed flights. A new method is proposed in this article to weaken the pressure fluctuations and aeroheating acting on the cylinder, through mounting an aerodome on the spike tip, which creates a cavity-like flow in front of the afterbody. Turbulent, axisymmetric flow at a freestream Mach number of Ma ∞ = 6.0 and a Reynolds number (based on the cylinder diameter D) of Re D = 0.13 × 106 is simulated using a temporally and spatially second-order-accurate finite volume method. Numerical results are verified by comparison with the experimental data available in the open literature. It is shown that flow pulsation under the spike length of L/D = 1.0 can be totally controlled as the aerodome diameter increases to D A /D = 23.0%, whereas flow oscillation under the spike length of L/D = 2.0 is suppressed as the aerodome diameter reaches D A /D = 10.0%. Besides, the combination of the double-aerodome and sonic jet is proved the most effective way to provide thermal protection for the afterbody, which smooths down the heat flux peak in the vicinity of the reattachment.
Highlights Inappropriate initialization methods may lead to non-physical flow modes. Flow pulsation/oscillation around the spiked blunt body is weakened using aerodome. Temperature field can be effectively controlled by a cooling jet on the aerodome. The introduction of cooling jet does not give rise to new flow instability.
Role of aerodome in pulsation/oscillation control and aeroheating reduction
Acta Astronautica ; 162 ; 481-496
2019-05-20
16 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
Aeroheating reduction for blunt body using aerodome jet
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