新型弹簧床结构的HAN基发动机技术

HAN-Based Thruster Technology with a New Spring Bed Structure

为改善硝酸羟胺(HAN)基发动机催化剂在长时间工作的工况下容易发生破碎而产生空穴的现象,本文提出一种新型弹簧床结构发动机设计方法,对发动机催化床进行改进优化设计。该设计可实现,常温环境下弹簧所提供的最大弹力不足以压碎催化剂;同时在高温环境下,弹簧的最小弹力足以克服催化床受到的流动阻力,可大幅提高发动机工作寿命、性能和可靠性。为验证该设计方法的有效性,分别开展了传统结构和新型弹簧床结构的HAN基1N发动机温启动试验。试验结果表明:在相同试验条件下,传统结构1N发动机温启动次数不超过150次,而使用新型弹簧床结构的1N发动机温启动次数超过了500次,且工作性能更优。试验结果证明了该设计方法的有效性,为HAN基发动机长寿命可靠工作奠定了良好的技术基础。

The catalyzer of the HAN-based thruster is prone to breakage in the long-time working conditions.A new design method of the thruster with a spring bed structure is proposed in this paper,which optimizes the structure of the thruster catalytic bed.The elastic force provided by the spring in the high temperature environment is sufficient to resist the flow friction generated by the catalytic bed.Meanwhile,the minimum elastic force is sufficient to overcome the flow resistance of the catalytic bed.All these advantages improve the longevity and reliability of the thruster.In order to verify the validity of the proposed design method,the hot-starting tests of both the traditional structure and the new spring bed structure designed for the 1 N HAN thruster are carried out.The results demonstrate that the hot-starting times of the 1 N thruster with the new spring bed structure exceed 500,compared to less than 150 cycles of 1 N thruster with the traditional structure.The studies provide a prospect foundation for the design of the HAN-based thruster.