| Citation: | DUAN Yanjuan, WANG Leqing, JIANG Yuguang, et al. Cooling characteristics of liquid ammonia for hypersonic solid-fueled scramjet[J]. Journal of Aerospace Power, 2025, 40（6）：20220920 doi: 10.13224/j.cnki.jasp.20220920
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Liquid ammonia is used as a new nitrogen-based coolant. Considering the real operating temperature and pressure of the scramjet engine, a three-dimensional numerical model was established to analyze the flow and heat transfer characteristics of liquid ammonia. The thermal properties were calculated by PR equation and Chung method. The phase change of ammonia was calculated by Lee evaporation model. Pyrolysis of ammonia was also considered. The flow heat transfer characteristics of liquid ammonia under different temperatures and pressures were studied by taking into account the process of phase change and pyrolysis. The cooling feature of ammonia was compared with traditional hydrocarbon fuel. The heat sink of liquid ammonia and hydrocarbon fuel was compared and analyzed under the same condition. The results showed that the heat transfer capacity of liquid ammonia increased with the rise of pressure. When pressure increased from 3 MPa to 17 MPa, heat transfer coefficient increased by 8.02%. Under the same mass flow rate, heat transfer coefficient of ammonia was higher and the wall temperature decreased by 36.3% in non-pyrolysis zone and 9.1% in pyrolysis zone.
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