某型无人机起落架放下阶段缓冲器气液流动特性研究  

Study on gas-liquid flow characteristics of buffers in the landing gear of a certain type of UAV landing gear lowering stage

作　　者：罗杰[1] 孙继勇 陈超 姜义尧 程晓宇 蒋炳炎[1] LUO Jie;SUN Jiyong;CHEN Chao;JIANG Yiyao;CHENG Xiaoyu;JIANG Bingyan(State Key Laboratory of High-Performance Complex Manufacturing,Central South University,Changsha 410083,China;AVIC Landing-gear Advanced Manufacturing Co.,Changsha 410200,China)

机构地区：[1]中南大学高性能复杂制造国家重点实验室,长沙410083 [2]中航飞机起落架有限责任公司,长沙410200

出　　处：《航空工程进展》2024年第1期118-126,共9页Advances in Aeronautical Science and Engineering

摘　　要：在设计飞机油气混合型式的可收放起落架时,应充分考虑其内腔之间的介质流动特性。以某型无人机起落架缓冲器阻尼孔径、充油量为研究对象,采用单因素实验法对各因素引起的缓冲器内部气液流动变化进行分析,通过Fluent软件对放下阶段不同阻尼孔径、充油量下的缓冲器气液特性进行仿真计算。结果表明:起落架放下过程缓冲器阻尼孔油液流量只与孔径大小有关,不受缓冲器充油量影响;在该型号无人机要求的637 mL充油量下,缓冲器阻尼孔孔径应大于6 mm;对于其他型号起落架缓冲器,当确定了充油量后,应将满足放下阶段缓冲器气液充填作为缓冲器阻尼孔设计标准之一。When designing the retractable landing gear of an aircraft oil-gas mixed type,the medium flow characteristics between the inner cavities should be fully considered.The damping aperture and fuel filling amount of a certain UAV landing gear buffer is taken as the research object,and the single factor experimental method is used to analyze the changes of gas-liquid flow inside the buffer caused by each factor.The gas-liquid characteristics of the buffer under different damping apertures and oil filling amounts in the lowering stage are simulated and calculated by Fluent software.The results show that the damping hole oil flow during the landing gear lowering process is only related to the size of the pore size,not affected by the oil filling amount of the buffer.Under the 637 mL oil filling required by this type of UAV,the buffer damping aperture should be greater than 6 mm.For other types of landing gear buffers,when the oil filling amount is determined,the gas-liquid filling of the buffer that meets the lowering stage should be used as one of the buffer damping hole design criteria.

关 键 词：缓冲器 阻尼孔径 气液充填时间 充油量 气液交换 

分 类 号：V226.2[航空宇航科学与技术—飞行器设计]