Effects of Structural Parameters on Pressure Characteristics of Two-stage Gas Reducer
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摘要: 为研究某型航空推进用气动双级气体减压器的结构参数对其压力特性的影响规律,建立双级气体减压器AMESim模型,通过仿真实验获得了双级气体减压器结构参数的数值不同时输出压力动态特性曲线,并进行统计分析。研究表明:结构参数对一级输出压力特性的敏感程度依次为一级活门杆密封的泄漏面积、二级活门杆密封的泄漏面积、一级运动件质量、膜片刚度,其中一级活门杆密封的泄漏面积增大,压力超调减小、振荡程度减弱,稳定性增高。结构参数对二级输出压力特性的敏感程度依次为膜片刚度、二级活门杆密封的泄漏面积、一级运动件质量、一级活门杆密封的泄漏面积,其中膜片刚度增大,压力超调减小、稳定性提高。Abstract: In order to study the influence of the structural parameters of a pneumatic two-stage gas pressure reducer on its pressure characteristics, the AMESim model of the two-stage pressure reducer is established. The dynamic characteristics curves of the output pressure with different structural parameters of the two-stage gas pressure reducer were obtained through simulation experiments, and statistical analysis was carried out. The results show that the sensitivity of structural parameters to the characteristics of the first-stage output pressure is orderly the leakage area of the first-stage valve rod seal, the leakage area of the second-stage valve rod seal, the mass of the first-stage moving parts and the stiffness of the diaphragm. With leakage area of the first-stage valve rod seal increases, the pressure overshoot decreases, the degree of oscillation decreases, and the stability increases. The sensitivity of the structural parameters to characteristics of the secondary output pressure is in the order of diaphragm stiffness, the leakage area of the secondary valve seal, the mass of the first-stage moving parts and the leakage area of the first-stage valve rod seal, in which the diaphragm stiffness increases, the pressure overshoot decreases and the stability increases.
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表 1 AMESim仿真参数设置
名称 子模块 参数 一级质量块 MAS005-1 质量0.034 kg 一级弹簧 PNPA003-1 刚度96 N/mm 一级泄漏面积 PN0R011-1 面积0.17 mm2 二级质量块 MAS005-2 质量0.043 kg 膜片组件 PNPA003-2 刚度240 N/mm 二级主弹簧 PNPA003-3 刚度58 N/mm 二级泄漏面积 PN0R011-2 面积0.01 mm2 表 2 一级运动件质量对压力P1的影响
质量m/kg 0.014 0.034 0.054 压力峰值/MPa 2.55 2.562 2.575 稳定压力/MPa 2.44 2.45 2.46 压力超调量/% 4.5 4.57 4.67 压力峰值时间/s 0.015 0.015 0.015 压力稳定时间/s 0.14 0.15 0.26 表 3 一级运动件质量对压力P2的影响
质量m/kg 0.014 0.034 0.054 压力峰值/MPa 0.906 0.907 0.917 稳定压力/MPa 0.73 0.73 0.73 压力超调量/% 24.1 24.2 25.6 压力峰值时间/s 0.085 0.085 0.085 压力稳定时间/s 0.145 0.148 0.15 表 4 膜片刚度对压力P1的影响
刚度K/(N·mm-1) 80 200 280 压力峰值/MPa 2.563 2.563 2.563 稳定压力/MPa 2.453 2.451 2.45 压力超调量/% 4.48 4.57 4.61 压力峰值时间/s 0.014 0.014 0.014 压力稳定时间/s 0.137 0.137 0.137 表 5 膜片刚度对压力P2的影响
刚度K/(N·mm-1) 80 200 280 压力峰值/MPa 0.866 0.895 0.916 稳定压力/MPa 0.66 0.714 0.75 压力超调量/% 31.2 25.35 22.1 压力峰值时间/s 0.08 0.085 0.089 压力稳定时间/s 0.132 0.135 0.143 表 6 一级密封泄漏面积对压力P1的影响
面积s/mm2 0.05 0.12 0.2 压力峰值/MPa 2.582 2.572 2.557 稳定压力/MPa 2.44 2.443 2.446 压力超调量/% 5.82 5.28 4.54 压力峰值时间/s 0.014 0.014 0.014 压力稳定时间/s 0.138 0.138 0.138 表 7 一级密封泄漏面积对压力P2的影响
面积s/mm2 0.05 0.12 0.2 压力峰值/MPa 0.905 0.906 6 0.907 5 稳定压力/MPa 0.730 8 0.731 1 0.731 3 压力超调量/% 23.84 24 24.1 压力峰值时间/s 0.086 0.084 0.084 压力稳定时间/s 0.162 0.162 0.162 表 8 二级密封泄漏面积对压力P1的影响
面积s/mm2 0.005 1 2 压力峰值/MPa 2.563 2.561 2.559 稳定压力/MPa 2.448 2.452 2.454 压力超调量/% 4.7 4.445 4.28 压力峰值时间/s 0.014 0.014 0.014 压力稳定时间/s 0.142 0.13 0.122 表 9 二级密封泄漏面积对压力P2的影响
面积s/mm2 0.005 1 2 压力峰值/MPa 0.907 0.846 0.791 稳定压力/MPa 0.731 0.712 0.601 压力超调量/% 24.08 18.82 31.6 压力峰值时间/s 0.087 0.071 0.059 压力稳定时间/s 0.155 0.215 0.319 -
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