Application progress of LDV and PIV in measuring flow in centrifugal compressor

The precise measurement of the centrifugal compressor flow field is very important to understand the internal flow characteristics. The traditional contact measurement technology has some defects, such as low spatial resolution, serious blockage effect, single measurement location and so on, which can not meet the measurement requirements of the modern advanced centrifugal compressor. Laser Doppler Velocimeter (LDV) and Particle Image Velocimeter (PIV) are two typical non-contact measurement technologies, which have the characteristics of high measurement accuracy, wide application range and non-contact measurement, showing great potential in the measurement of the internal flow field of the centrifugal compressor. By combing the application status of the LDV and PIV velocity measurement technology in measuring the internal flow field of the centrifugal compressor at home and abroad, the application progress of the LDV and PIV velocity measurement technology in measuring the internal flow field of the centrifugal compressor is introduced. Focusing on the experimental scheme, experimental details and technical difficulties, and combining with the future development trend of the measurement technology, the application of the LDV and PIV velocity measurement technology in the centrifugal compressor is discussed from the perspective of practical application. The application of internal flow field measurement is summarized and prospected.