柔性变形自加压水火箭的推力特性分析
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国防科技大学 空天科学学院

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V19

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湖南省教育改革研究项目(2020JGZD003);青年人才自主研究培育项目(KY0505072201)


Analysis on the thrust characteristics of flexible deformation self-pressurized water rocket
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    摘要:

    推力特性直接影响水火箭的发射速度、高度和射程,为了提高水火箭的推力性能,基于现有固定容积气压舱,设计了柔性可变形自加压的弹性气压舱方案,并对其性能进行评估。利用伯努利定理和变形协调关系,建立了水火箭内部压力、喷口速度与推力的耦合模型,采用数值计算方法研究了不同初始状态(装水量和充气压力)对水火箭推力的影响规律,对比分析了相同初始状态下,定容气压舱与弹性气压舱所产生推力的差异性。研究结果表明,改进的柔性可变形弹性气压舱可以有效提高水火箭发射过程中的水流喷射速度,使相同初始状态下水火箭产生的推力平均值提升46.95%。相关研究为提高水火箭的飞行性能和新型柔性变形水火箭方案的优化设计提供重要参考。

    Abstract:

    Since the thrust characteristics directly affect the launch speed, altitude and flight range of the water rocket, in order to improve the thrust of the water rocket, a flexible and deformable self-pressurized elastic air pressure cabin scheme was designed based on the existing fixed volume pressure chamber, and its performance was evaluated. With Bernoulli's theorem and deformation coordination , a coupled model of internal pressure, nozzle velocity and thrust of water rocket was established. Moreover, the influence of different initial states (water volume ratio and inflation air pressure) on water rocket thrust was also studied with the numerical calculation method, and the thrust difference was compared and analyzed further between the fixed air pressure cabin and the elastic air pressure cabin under the same initial conditions. The research results show that the improved flexible and deformable self-pressurized elastic air pressure cabin could effectively increase the water jet velocity during the launch, and the thrust generated by the water rocket in the same initial state increases significantly by 46.95%. This study provides important reference and approach for improving the flight performance of water rockets and the optimal design of new flexible deformation water rocket.

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  • 收稿日期:2023-01-20
  • 最后修改日期:2023-07-03
  • 录用日期:2023-07-06
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