火箭推进

为试验研究火箭发动机液流部件或系统在脉动流态中的动态响应特性及可靠性问题,迫切需要一种装置来产生频率与幅值可控的脉动流。研制了一种新型脉动压力激励装置及系统,它由激励装置本体、磁力传动和控制系统等构成。激励系统设计了一种内置式旋转轮机构,转动时周期性通断管路,由此实现在管路中激励产生脉动压力; 采用电磁感应传动装置实现无泄漏传递扭矩动力; 自动控制转轮转速变化,实现脉动压力的频率变化控制。试验结果表明,激励装置系统在18 MPa的管路中,能产生频率为0～250 Hz的脉动压力激励,压力时域幅值超过7 MPa,分频幅值超过6.6 MPa。激励装置系统可通过调节流量、改变孔板孔径来调节脉动压力幅值,可通过改变转速来实现脉动压力的定频或扫频。所研制的激励装置系统运行时实现零泄漏,适用于高压、低温、有毒或易燃等介质环境,能有效解决某些特殊条件下管路脉动压力激励的实现问题。

In order to experimentally study the dynamic response characteristics and reliability issues of fluid flow components or systems of rocket engine in pulsating flow states, there is an urgent need for a device to generate pulsating flow with controllable frequency and amplitude. New type of pulsating pressure excitation device and system was developed, which consists of the excitation device body, magnetic transmission and control system. Built-in rotating wheel mechanism was designed, which periodically opens and closes the pipeline during rotation, thereby generating pulsating pressure in the pipeline. Electromagnetic induction transmission device was used for achieving leak free transmission of torque and power. By adopting automatic control of wheel speed changes, frequency variation control of pulsating pressure is achieved. The experiment shows that the excitation device system can generate pulsating pressure excitation with a frequency of 0-250 Hz in 18 MPa, with a pressure time domain amplitude exceeding 7 MPa and a frequency division amplitude exceeding 6.6 MPa. The excitation device system can adjust the amplitude of pulsating pressure by adjusting the flow rate and changing the aperture of the orifice plate. Two different excitation methods, fixed frequency or sweep frequency, can be achieved by changing the speed. The excitation device system achieves zero leakage during operation and is suitable for medium environments such as high pressure, low temperature, toxic or flammable environments. It can effectively solve the implementation problem of pipeline pulsation pressure excitation under special conditions.

引言
1 激励器装置
2 试验结果
3 结论

图1 激励装置示意图<br/>Fig.1 Schematic illustration of excitation device

图1 激励装置示意图
Fig.1 Schematic illustration of excitation device

图2 激励装置系统<br/>Fig.2 Excitation device system

图2 激励装置系统
Fig.2 Excitation device system

图3 测控系统数据传递示意图<br/>Fig.3 Data transfer diagram of measurement and control system

图3 测控系统数据传递示意图
Fig.3 Data transfer diagram of measurement and control system

图4 试验管路示意图<br/>Fig.4 Schematic illustration of test pipeline

图4 试验管路示意图
Fig.4 Schematic illustration of test pipeline

图5 定频激励下A点和B点处脉动压力波形图(150 Hz)<br/>Fig.5 Fluctuating pressure waveform at points A and B under constant frequency excitation(150 Hz)

图5 定频激励下A点和B点处脉动压力波形图(150 Hz)
Fig.5 Fluctuating pressure waveform at points A and B under constant frequency excitation(150 Hz)

图6 定频激励下A点和B点处脉动压力波形图(170 Hz)<br/>Fig.6 Fluctuating pressure waveform at points A and B under constant frequency excitation(170 Hz)

图6 定频激励下A点和B点处脉动压力波形图(170 Hz)
Fig.6 Fluctuating pressure waveform at points A and B under constant frequency excitation(170 Hz)

图7 定频激励下A点和B点处脉动压力频谱图(150 Hz)<br/>Fig.7 Frequency spectrum of pulsating pressure at points A and B under constant frequency excitation(150 Hz)

图7 定频激励下A点和B点处脉动压力频谱图(150 Hz)
Fig.7 Frequency spectrum of pulsating pressure at points A and B under constant frequency excitation(150 Hz)

图8 定频激励下A点和B点处脉动压力频谱图(170 Hz)<br/>Fig.8 Frequency spectrum of pulsating pressure at points A and B under constant frequency excitation(170 Hz)

图8 定频激励下A点和B点处脉动压力频谱图(170 Hz)
Fig.8 Frequency spectrum of pulsating pressure at points A and B under constant frequency excitation(170 Hz)

图9 扫频激励下的脉动压力波形图<br/>Fig.9 Pulse pressure waveform under sweep frequency excitation

图9 扫频激励下的脉动压力波形图
Fig.9 Pulse pressure waveform under sweep frequency excitation

图10 扫频激励下的脉动压力色谱图<br/>Fig.10 Fluctuating pressure chromatogram under sweep frequency excitation

图10 扫频激励下的脉动压力色谱图
Fig.10 Fluctuating pressure chromatogram under sweep frequency excitation

图11 扫频激励下脉动压力主频分量时频图<br/>Fig.11 Time-frequency diagram of main frequency component for fluctuating pressure under sweep excitation

图11 扫频激励下脉动压力主频分量时频图
Fig.11 Time-frequency diagram of main frequency component for fluctuating pressure under sweep excitation

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备注

引言

1 激励器装置

2 试验结果

3 结论

期刊信息