火箭推进

为研究瞬变流速激励下某型卫星姿控发动机燃料输送管路的非线性振动特性,采用加权余量法和四阶Runge—Kutta法对燃料输送管路的非线性液固耦合振动模型进行了数值仿真,研究不同燃料流速下、电磁阀开关时长对燃料管路非线性振动稳定性的影响。仿真结果表明,依据管路特征线可将管路振动分为稳定振动区和不稳定振动区,且不稳定振动主要表现为发散失稳和扩张失稳。当电磁阀开关时长处于失稳区时,电磁阀门开启时长引起的燃料管路不稳定振动为多频率、变幅值的动态扩张失稳,且燃油流速增大是影响管路振动扩张断裂的主要因素; 电磁阀门关闭时长引起的燃料管路不稳定振动为单频、变幅值扩张失稳。

In order to investigate the effect of transient flow velocity on nonlinear vibration characteristics of fuel pipeline in attitude control engine, a nonlinear liquid-solid coupling model of fuel pipe was developed and simulated by use of the weighted residuals method and the fourth-order Runge-Kutta method. The effect of the opening and closing time of the solenoid valve on the nonlinear vibration of fuel pipe was studied under different transient fuel flow rates. The results show that the pipeline vibration can be divided into stable vibration zone and unstable vibration zone according to the pipeline characteristic curve, and the unstable vibration is mainly manifested as divergent instability and distensibility instability. When the opening/closing time of solenoid valve locates in the instability region, the multi-frequency and variable amplitude expansion vibration of fuel pipeline will be induced by the transient flow velocity of fuel because of the sudden opening of the solenoid valve and the increased flow velocity of fuel is one of the mainfactor that results in the cracks of fuel pipeline. However, the single-frequency and variable amplitude expansion vibration of fuel pipeline is caused by the unstable vibration of the fuel pipeline due to the sudden closing of the solenoid valve.

引言
1 管路模型分析
2 燃油管路的振动稳定分析
3 结论

图1 管路分析理论模型<br/>Fig.1 Analyzed model of pipeline

图1 管路分析理论模型
Fig.1 Analyzed model of pipeline

图2 流体单元受力分析<br/>Fig.2 Forces acting on the fluid element

图2 流体单元受力分析
Fig.2 Forces acting on the fluid element

图3 管路单元受力分析<br/>Fig.3 Forces acting on the pipe element

图3 管路单元受力分析
Fig.3 Forces acting on the pipe element

图4 电磁阀开启时长对管路稳定特征线的影响<br/>Fig.4 Effect of the opening time of the solenoid valve steady characteristics line of pipeline

图4 电磁阀开启时长对管路稳定特征线的影响
Fig.4 Effect of the opening time of the solenoid valve steady characteristics line of pipeline

图5 电磁阀关闭时长对管路稳定特征线的影响<br/>Fig.5 Effect of the closing time of the solenoid valve on steady characteristics line of pipeline

图5 电磁阀关闭时长对管路稳定特征线的影响
Fig.5 Effect of the closing time of the solenoid valve on steady characteristics line of pipeline

图6 流量30 kg/min时不同开启时长的管路位移时域曲线<br/>Fig.6 Displacement curve of pipe with different opening time when the flow rate is 30 kg/min

图6 流量30 kg/min时不同开启时长的管路位移时域曲线
Fig.6 Displacement curve of pipe with different opening time when the flow rate is 30 kg/min

图7 开启时长100 ms时不同流量的管路位移时域曲线<br/>Fig.7 Displacement curve of pipe with different flow rate when the opening time is 100 ms

图7 开启时长100 ms时不同流量的管路位移时域曲线
Fig.7 Displacement curve of pipe with different flow rate when the opening time is 100 ms

图8 流量30 kg/min时不同开启时长对管路位移的影响<br/>Fig.8 Displacement curve of pipe with different opening time when the flow rate is 30 kg/min

图8 流量30 kg/min时不同开启时长对管路位移的影响
Fig.8 Displacement curve of pipe with different opening time when the flow rate is 30 kg/min

图9 开启时长5.157 ms时不同流速对管路位移的影响<br/>Fig.9 Displacement curve of pipe with different flow rate when the opening time is 5.157 ms

图9 开启时长5.157 ms时不同流速对管路位移的影响
Fig.9 Displacement curve of pipe with different flow rate when the opening time is 5.157 ms

图10 流量30 kg/min时不同关闭时长对应的管路位移曲线<br/>Fig.10 Displacement curve of pipe with different closing time when the flow rate is 30 kg/min

图10 流量30 kg/min时不同关闭时长对应的管路位移曲线
Fig.10 Displacement curve of pipe with different closing time when the flow rate is 30 kg/min

图11 关闭时长300 ms时不同流量对应管路位移曲线<br/>Fig.11 Displacement curve of pipe with different flow rate when the closing time is 300 ms

图11 关闭时长300 ms时不同流量对应管路位移曲线
Fig.11 Displacement curve of pipe with different flow rate when the closing time is 300 ms

图12 关闭时长245 ms且流量为20 kg/min时管路位移曲线<br/>Fig.12 Displacement curve of pipe when the closing time is 245 ms and the flow rate is 20 kg/min

图12 关闭时长245 ms且流量为20 kg/min时管路位移曲线
Fig.12 Displacement curve of pipe when the closing time is 245 ms and the flow rate is 20 kg/min

图13 不同流量时管路的振动频率<br/>Fig.13 Vibration frequency of pipe at different flow rate

图13 不同流量时管路的振动频率
Fig.13 Vibration frequency of pipe at different flow rate

图14 流量50 kg/min时不同关闭时长对应的管路位移曲线<br/>Fig.14 Displacement curve of pipe with different closing time when the flow rate is 50 kg/min

图14 流量50 kg/min时不同关闭时长对应的管路位移曲线
Fig.14 Displacement curve of pipe with different closing time when the flow rate is 50 kg/min

图15 关闭时间300 ms时不同流量对应的管路位移曲线<br/>Fig.15 Displacement curve of pipe with different flow ratewhen the closing time is 300 ms

图15 关闭时间300 ms时不同流量对应的管路位移曲线
Fig.15 Displacement curve of pipe with different flow ratewhen the closing time is 300 ms

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备注

引言

1 管路模型分析

2 燃油管路的振动稳定分析

3 结论

期刊信息