Ground direct-connection experiment of low-thrust magnesium powder water ramjet
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摘要:
以镁粉为燃料,开展水冲压发动机地面直连试验,采用变出口面积与变压力供给镁粉相结合的动态调节方法,成功解决了燃烧室压力与镁粉供给压力不平衡造成的火焰返流问题,实现了金属粉末式水冲压发动机稳定燃烧。采用两次供给,分三组布置的方式进行冲压供水,总水燃比为2.5,燃烧室平均压力为0.181 MPa,平均推力为41.46 N,金属燃料燃烧效率为76.98%。试验表明:合理的供粉压差是影响发动机稳定工作的一个重要因素,发动机工作时序对点火成功和稳定运行至关重要,建立合理的燃烧室热环境,是确保发动机持续稳定燃烧的关键。
Abstract:A ground-connected experiment of a water ramjet engine using magnesium powder as fuel was successfully conducted. By using a continuous adjustment method integrating a variable exit area with a variable-pressure magnesium powder supply, the issue of flameback caused by pressure imbalances between the combustion chamber and the fuel supply system was effectively resolved. This method enabled stable combustion within the metal powder-based water ramjet engine. The engine utilized a dual-stage water injection system arranged in three groups, achieving a total water-to-fuel ratio of 2.5. The combustion chamber maintained an average pressure of 0.181 MPa, producing an average thrust of 41.46 N, with a metal fuel combustion efficiency of 76.98%. The experimental results indicated that an appropriate pressure differential for powder supply is a critical factor for ensuring stable engine operation. Furthermore, the engine’s operating sequence is essential to successful ignition and stable performance. Establishing a suitable thermal environment within the combustion chamber can be identified as the key to achieve continuous and stable combustion in the engine.
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