The axial pump's big flow and low head features make it a popular choice for pumping station installationsThe purpose of this study is to determine how transiently changing flow circumstances affect the relative flow channel between the impeller and the flow field, thereby affecting pulsation. Through the use of physical model testing, the reliability of both experimental and numerical simulations of the device's flow channel was verified. The analysis conducted in the study focused on investigating the flow field and pressure pulsation characteristics of the impeller across different flow rates, while also exploring the impact of blade angle (-3°, 0°, and 3°) under five distinct operational conditions, ranging from optimal to flow conditions at best efficiency point (QBEP) plus value. According to the study, the axial pump's flow stability declined with decreasing flow rate, which resulted in increased pressure pulsations across various flow regions. Additionally, Most flow regions were affected by an increase in flow instability, levels of the pressure pulsation, and frequencies of the dominant rotor-stator interaction when the blade angle was increased from -3° to 3°. As a result of these findings, it may be possible to optimize axial flow pump device designs and enhance their stability. Furthermore, they are helpful for researchers and engineers interested in improving their understanding of pump flow dynamics.