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- W3126793930 abstract "The main motivation of the current study is to propose a high-pressure hydrogen injection as an hybrid active flow control technique in order to manipulate the flow-field in front of a blunt nose during hypersonic flight. Hydrogen injection can lead to self-igition under the right environment conditions in a stagnation zone, and may cause thermal heat addition through combustion and provide the counterjet effect together by pushing bow shock upstream. The axisymmetric numerical simulations for the hemispherical blunt nose are performed at a Mach 6 freestream flow with 10000 Pa pressure and 293 K temperature. The sonic and supersonic hydrogen and air injections are compared for drag reduction at the same stagnation pressure ratio $PR$ and momentum ratio ($R_{MA}$). The sonic air and hydrogen injection scenarios show similar performance in terms of drag reduction and similar SPM flow features, but hydrogen injection has a mass flow rate 3.76 times lower than air. Supersonic hydrogen injection at $M_j$ 2.94 behaves differently than supersonic air injection and can achieve up to 60 % drag reduction at lower PR and LPM mode with lower mass flow rate. Additionally, air injection achieves a drag reduction of 40 % in SPM mode at higher PR with very high mass flow rate." @default.
- W3126793930 created "2021-02-15" @default.
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- W3126793930 date "2021-01-01" @default.
- W3126793930 modified "2023-09-24" @default.
- W3126793930 title "Drag Control by Hydrogen Injection in Shocked Stagnation Zone of Blunt Nose" @default.
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- W3126793930 doi "https://doi.org/10.1088/1757-899x/1024/1/012110" @default.
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