| 摘要: |
| 流体输送管道中阀门、孔板等节流装置经常出现空化现象，造成设备及管道剧烈振动，影响系统安全运行。以孔板为研究对象，针对节流空化状态的流场特性进行研究分析，利用标准偏差分析和小波分析对节流装置入口压力脉动信号进行特征提取，并对节流装置空化流场特性进行分析仿真分析。研究结果表明，节流装置发生空化时，产生的气泡运动呈现低频髙幅值的压力脉动特性，节流装置入口压力脉动强度显著高于非空化状态，利用小波分析可识别出节流装置入口压力脉动空化状态下的低频髙幅值脉动特性，节流空化的产生机理是由于真空引射产生的漩涡低压区低于当地饱和蒸气压，产生气泡。可通过节流装置入口压力脉动标准偏差分析和小波分析方法对节流装置空化进行状态识别和诊断，为阀门、孔板等节流装置的性能优化提供理论依据。 |
| 关键词: 节流空化 压力脉动 标准偏差 小波分析 状态识别 |
| 基金项目: |
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| Characteristic Analysis of Throttling Cavitation Flow Field Based onPressure Fluctuation Analysis |
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Shi Ruijie Song Ge Fu Hao Ma Hangyuan Zhang Dong
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Beijing Aerospace Propulsion Institute, Beijing 100076
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| Abstract: |
| Valves, orifice plates, and other throttling devices in fluid transportation pipelines often experience cavitation, causing severe vibration of equipment and pipelines, and affecting the safe operation of the system. Taking the orifice plate as the research object, the flow field characteristics of the throttling cavitation state are studied and analyzed. Standard deviation analysis and wavelet analysis are used to extract features of the pressure pulsation signal at the inlet of the throttling device, and the cavitation flow field characteristics of the throttling device are analyzed and simulated. The research results show that when cavitation occurs in the throttling device, the bubble movement produced presents the pressure fluctuation characteristics of low frequency and high amplitude, and the pressure fluctuation intensity at the inlet of the throttling device is significantly higher than that in the non cavitation state. The low-frequency and high amplitude fluctuation characteristics under the pressure fluctuation cavitation state at the inlet of the throttling device can be identified by using wavelet analysis. The mechanism of throttling cavitation is that the vortex low-pressure zone generated by vacuum injection is lower than the local saturated Vapor pressure, Produce bubbles. The state identification and diagnosis of cavitation in throttling devices can be achieved through standard deviation analysis of inlet pressure pulsation and wavelet analysis methods, providing a theoretical basis for optimizing the performance of throttling devices such as valves and orifice plates. |
| Key words: throttling cavitation pressure fluctuation standard deviation wavelet analysis state recognition |
