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| A non-contact modal identification technique for a centrifugal impeller immersed in fluid |
| HUO Shihui1,HUANG Daoqiong1,HUANG Hong2,REN Wu2,XUAN Tong2 |
1. National Key Laboratory of Science and Technology on Liquid Rocket Engines, Xi’an 710100, China；
2. Xi'an Aerospace Propulsion Institute, Xi'an 710100, China |
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Abstract To identify modal characteristics of a centrifugal impeller immersed in fluid,a new non-contact modal identification technique was proposed to study effects of fluid on wet modes of the impeller. A 3D laser Doppler vibration measurement system was used to realize a structure’s vibration measurement at its measured points. Laser refraction effects caused by different media were fully considered in vibration measurement of the immersed structure. Modal identification was conducted using LMS modal analysis system. It was shown that the impeller’s modal characteristics obtained with the non-contact modal identification technique agree well with those measured using conventional mature acceleration sensors,so the proposed non-contact modal identification technique can be well used in immersed structures’ modal identification. Wet modal characteristics of the centrifugal impeller immersed in water and liquid oxygen analog medium were measured with this non-contact method. The results showed that fluid mediums cause decrease in the impeller’s natural frequencies to different extents,their effects on different orders of the impeller’s natural frequencies can be well consistent; the influence of dipping medium at different liquid level on the modal characteristics of the impeller is different.
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Received: 25 September 2017
Published: 28 March 2019
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