Effect of the heat release on ejector-to-ramjet dynamic mode transition process in the rocket-based combined cycle engine

Hu, Yupeng; Liu, Yuan-Shu; Wang, Yijun; Zhou, Ben-Quan; Zheng, Xiaohui; Xue, Rui

doi:10.1016/j.icheatmasstransfer.2022.106539

Cited by 4 publications

(1 citation statement)

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“…Some other studies showed that local heat release rates are maximized when the solid fuel is fully reacted with high-velocity inflow air [13]. Hu [14] found that for rocket-based combined cycle (RBCC), an ejecting rocket's heat release and combustion efficiency was enhanced with more fuel injected into the front of the combustion chamber. The studies [15][16][17] on micro-combustor showed that the length of the combustion chamber affected combustion efficiency by changing the residence time and thermophysical properties of the reacting species.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of Mixing Effect on Coupled Heat Release and Transfer Performance of a Novel Segregated Solid Rocket Motor

Liu,

Zhang,

Wang

et al. 2024

Aerospace

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The effect of mixing on coupled heat release and transfer performance of a novel segregated solid motor is numerically evaluated with a transient two-dimensional combustion model. The results show that vortex structures are formed and evolved in the combustion chamber. Quantitative calculation of the mixing effect shows the inhomogeneous distribution of oxidant and fuel species. The well-mixing area is located in a narrow belt-like coupled combustion region near the burning surface of the propellant. Heat transfer coefficient decreases greatly due to lower combustion reaction rate and enlarged flow channel area. Heat transfer coefficients near the two ends of the propellant grain are higher than other parts due to the influence of vortex mixing. Raising the inlet mass flow rate leads to enhanced mixing and heat transfer, which results in a lower temperature and regression rate of the propellant with combustion time. Temperature and oxidation rates of H2 and CO are unevenly distributed in the boundary layer of coupled combustion. Increasing the mass flux of inlet oxidizer gas leads to a higher combustion heat release rate. Therefore, the gas-phase temperature increases significantly. The heat release rate reaches the maximum near the ends of the propellant grain, where vortex mixing strengthens the coupled combustion process in the motor.

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Section: Introductionmentioning

confidence: 99%