Experimental Investigation on Pressure and Flame Surface Oscillation in a Dual-Cavity Scramjet Combustor

Wenhao Liao (), Yidan Chen () and Ningfei Wang
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Wenhao Liao: School of Aerospace Engineering, Beijing Institute of Technology, Beijing 100081, China
Yidan Chen: School of Aeronautics and Astronautics, Zhejiang University, Hangzhou 310027, China
Ningfei Wang: School of Aerospace Engineering, Beijing Institute of Technology, Beijing 100081, China

Energies, 2024, vol. 17, issue 7, 1-12

Abstract: Pressure and flame surface oscillations are common in supersonic combustion instability. Understanding the characteristics, generation, maintenance, and interaction mechanisms of these oscillations is crucial. An experimental setup with an alcohol heater was used to study injection positions and fuel quantities in a dual-cavity scramjet combustion chamber. High-frequency pressure sensors and high-speed equipment were employed in this research. The most significant pressure oscillation occurred at a global equivalence ratio of 1.2 with a frequency of 300 Hz and an amplitude of 43%. Mean oscillation was not affected by changes in equivalence ratio. Increased amplitude was linked to stronger flow instability, indicating that flow instability induced by unstable heat release plays a significant role in supersonic combustion instability.

Keywords: supersonic combustion instability; nonlinear dynamics; scramjet combustors (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2024
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