An Acoustic Emission Study on the Starting and Stopping Processes of a Dry Gas Seal for Pumps
An Acoustic Emission Study on the Starting and Stopping Processes of a Dry Gas Seal for Pumps
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DOI：
10.1007/s11249-012-0077-7
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发表时间：
2013-02
影响因子：
3.2
通讯作者：
Weifeng Huang;Youbin Lin;Zhidong Gao;Wenjing Fan;Shuangfu Suo;Yuming Wang
中科院分区：
文献类型：
--
作者：
Weifeng Huang;Youbin Lin;Zhidong Gao;Wenjing Fan;Shuangfu Suo;Yuming Wang
采用声发射（AE）技术对泵用干气密封的启动和停止过程进行了研究。在三个不同的对比实验中，将密封面接触的特征频带与噪声区分开来。通过对声发射信号进行带通滤波，确定了声发射信号的均方根值，有效地反映了密封端面的接触状况。根据AE RMS的特点，将启动过程和停止过程分为三个阶段，并定义了起飞转速和着陆转速。提升速度随入口压力呈非单调变化。在一定的压力下，剥离速度最小，这意味着在该速度下密封件最容易面临剥离。触地速度的行为与离地速度的行为相似，但比后者稍小。这些结果揭示了声发射技术用于监测干气密封在启动和停止过程中的接触状态的潜力，并可能有助于干气密封的设计和运行。
The starting process and the stopping process of a double dry gas seal for pumps were investigated by acoustic emission (AE) testing. The characteristic frequency band of contact of the seal faces was distinguished from noises in three different comparative experiments. The root mean square (RMS) of the AE signals after band-pass filtering was determined to effectively reflect the contact condition of the seal faces. Based on the characteristics of the AE RMS, both the starting process and the stopping process could be divided into three periods, and a lift-off rotational speed and a touch-down rotational speed were defined. The lift-off speed varied non-monotonically with the inlet pressure. The lift-off speed was smallest at a certain pressure, which meant that at that speed the seal faces lift-off most easily. The behavior of the touch-down speed was similar to that of the lift-off speed, but was a little smaller than the latter. These results reveal the potential of AE technology for monitoring the contact condition of dry gas seals during the starting and stopping processes and may help in the design and operation of the dry gas seals.