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封闭的直升机燃油管路,因热膨胀,可能导致管路零部件破坏。文章针对密封燃油管路腔内燃油及气体的热膨胀特性,建立了热膨胀模型,进行了数字仿真,并与试验结果比较,验证了模型的准确性,分析了管路材料和腔内不同气体体积含量对密封腔内压力的影响。结果表明,对于同一封闭的燃油管路热膨胀导致压力增大因素主要有管路弹性模量以及密封腔内气体体积含量,其中燃油密封腔内气体体积含量对腔内压力变化影响最大。通过分析,可为直升机燃油管路的热释放及管路薄弱环节的设计,提供参考。
Closed helicopter fuel lines, due to thermal expansion, may lead to pipeline parts damage. In this paper, according to the thermal expansion characteristics of the fuel and gas in the sealed fuel pipeline, the thermal expansion model is established and the numerical simulation is carried out. The accuracy of the model is verified by comparison with the experimental results. Impact on the pressure in the sealed chamber. The results show that the main causes of pressure increase are the elastic modulus of pipe and the volume of gas in the sealed chamber. The volume of gas in the sealed chamber has the greatest influence on the pressure in the chamber. Through the analysis, it can provide reference for the heat release of the helicopter fuel pipeline and the design of the pipeline weakness.