Cavitation commonly induces performance deterioration and system vibration in many engineering applications. This paper aims to investigate the effects of air injection on cavitation evolution, pressure pulsation and vibration in a centrifugal pump with inducer. In this paper, the high-speed camera is used to capture the gas flow pattern and cavitation evolution process in the inducer. The impacts of air injection on the inlet pressure pulsation and vibration are also investigated. The results show that the cavitation development in the inducer undergoes four patterns: incipient cavitation, sheet cavitation, cloud cavitation and super cavitation. During the development of cavitation, the main frequency of the pressure pulsation shifts to lower frequencies, and the amplitude of the vibration increases. In addition, air injection promotes the incipient cavitation but delays the cavitation development. A small amount of air can effectively decrease amplitudes of pressure pulsation and vibration. But as the air content increases, the fluctuations and amplitudes of pressure pulsation and vibration increase.

在许多工程应用中，气蚀通常会导致性能恶化和系统振动。本文旨在研究注空气对带诱导轮的离心泵空化演化、压力脉动和振动的影响。本文利用高速摄像机捕捉诱导轮内的气体流动模式和空化演化过程。还研究了空气喷射对入口压力脉动和振动的影响。结果表明，诱导轮内的空化发展经历了四种模式：初生空化、片状空化、云状空化和超级空化。在空化发展过程中，压力脉动的主频率向较低频率移动，振动幅度增大。此外，空气喷射促进了初期空化，但延迟了空化的发展。少量的空气可以有效地降低压力脉动和振动的幅度。但随着空气含量的增加，压力脉动和振动的波动和幅度增大。