With the rapid advancement of science and technology nowadays, plug-in centrifugal fans have become commonplace equipment, creating favorable conditions for people’s daily life and work. Accordingly, the safety and dynamic performance of plug-in centrifugal fans must meet specified performance indicators.

In terms of the aerodynamic performance of plug-in centrifugal fans, the torque method and standard test configuration are generally adopted for calculation and measurement. The aerodynamic performance of plug-in centrifugal fans is generally divided into two categories: air intake performance and exhaust performance. This research focuses on the air intake test of plug-in centrifugal fans. For instance, experimental data can be collected under operating conditions of 150 kW power and a rotational speed of 3000 revolutions per minute. Intuitive and accurate measured data can lay a reliable foundation for analytical conclusions.

Numerous known parameters are required for data processing and result analysis in this experiment, including dry-bulb temperature, wet-bulb temperature, relative humidity, collector orifice diameter, arc-type collector flow coefficient, conical collector flow coefficient, inlet pipe diameter, inlet cross-sectional area, outlet cross-sectional area, impeller diameter, mechanical balance power, and other relevant variables. These parameters can be used to pre-calculate the pressure difference of the collector, followed by calculation of the static pressure at the measuring section. Furthermore, as the test is conducted at the same location, time and ambient condition, the atmospheric pressure and ambient temperature remain constant throughout the experiment, resulting in identical saturated vapor pressure of water vapor. The rotational speed and torque of the plug-in centrifugal fan can then be derived accordingly. After processing the experimental data, the air intake performance curve of the plug-in centrifugal fan can be plotted to characterize its air intake performance.