Dr. Yunchao Feng Profile

Dr. Yunchao Feng

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Proceedings Article | 17 August 2024 Paper

Influence of the combustor length on the combustion characteristics of the gas-particle two-phase gas

Libei Zhao, Zhixun Xia, Likun Ma, Yunchao Feng, Binbin Chen, Pengnian Yang, Yandong Liu

Proceedings Volume 13218, 132182J (2024) https://doi.org/10.1117/12.3033781

KEYWORDS: Combustion, Particles, Solids, Numerical simulations, Rockets, Nozzles, Carbon monoxide, Boron

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In order to improve the combustion efficiency of gas-particle two-phase gas in the combustor of solid rocket scramjet, the influence of the combustor length on the combustion characteristics of gas-particle two-phase gas under Ma6 and 25km inlet flow was studied by numerical simulation. The results show that the main area of fuel combustion is the first expansion section. In addition, part of the fuel is also burned in the equal straight section, which can maintain a high working pressure for the first expansion section to improve the combustion efficiency of the combustor. The second expansion section is conducive to gas expansion work and improves the total pres-sure recovery coefficient. The numerical results show that the gas phase components in the fuel-rich gas can burn quickly after entering the combustor, and the combustion efficiency of the granular phase fuel is the main factor determining the total combustion efficiency of the fuel. The combustion mode is determined by the heat release intensity of gas-particle two-phase gas in the combustor.

Proceedings Article | 17 August 2024 Paper

Influence of nozzle arrangement on the combustion performance of particle-laden fuel-rich jet

Pengnian Yang, Zhixun Xia, Likun Ma, Yunchao Feng, Libei Zhao

Proceedings Volume 13218, 1321817 (2024) https://doi.org/10.1117/12.3032581

KEYWORDS: Combustion, Particles, Nozzles, Boron, Temperature distribution, Numerical simulations

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The working process of a solid rocket scramjet can be summarised as the mixing and combustion of particle-laden fuel-rich jet(PFRJ) with supersonic airflow. A numerical simulation study was carried out to determine the influence of nozzle arrangement on the combustion of PFRJ. The effects of three factors, namely the number, angle and position of nozzles, on the combustion of PFRJ with supersonic airflow were investigated in terms of flow parameters, combustion efficiency, temperature distribution and particle trajectory, respectively. The results show that: (1) Increasing the number of nozzles increases the contact area between the PFRJ and the supersonic airflow. Increasing the nozzle angle not only increases the penetration depth of the PFRJ, but also distributes them more widely in the span direction. (2) Nozzle angle has little effect on the combustion efficiency of PFRJ. However, when the nozzle position is arranged on both sides, the combustion efficiency of gas and carbon particles in PFRJ is significantly improved. (3) The gas and particles have the characteristics of zoned combustion. Too concentrated heat release from the gas is not conducive to particle heating and ignition. Particle combustion requires a high temperature and oxygen rich environment. How to create and introduce particles into a high temperature and oxygen rich environment is the key to improving particle combustion efficiency. The low combustion efficiency of boron particles has become the main reason for limiting the energy release of PFRJ.

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