| Citation: | Chen Zizheng, Liu Conglin, Chen Hong, et al. Design and simulation of distributed multiple branches inlet pipeline for water ramjet[J]. Journal of Aerospace Power, 2026, 41（7）：20250237 doi: 10.13224/j.cnki.jasp.20250237
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To enhance the high-penetration performance of underwater vehicles such as torpedoes, a multi-stage thrust scheme was designed for metal water ramjet. For addressing the significant total pressure loss in conventional water intake channels, an efficient resistance loss reducing water intake scheme with a multi-branch distributed non-circular pipeline was proposed, inspired by the structure of pintle-type variable thrust motors. This scheme was designed to achieve highly efficient resistance loss reduction. Through a combination of theoretical analysis and numerical simulation, the effects of pipeline layout, cross-sectional shape, and water injection port distribution on pipeline resistance loss were systematically investigated. The results showed that, taking the secondary water inlet pipeline as an example, compared with an external water inlet method with the same water flow rate, the distributed water inlet layout reduced the pressure loss by 50%. Introducing a non-circular cross-section further reduced the pressure loss by 22.45%, and incorporating multi-branch water inlets further reduced it by 13.17%. Overall, this distributed multi-branch non-circular pipeline scheme enabled uniform axial distribution of water inlet in the combustion chamber while significantly reducing the pressure loss by 85.62%. This study could provide a technical pathway for performance optimization of water ramjet.
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