Performance Testing of High-Pressure Axial Flow Fans in Sawdust Conveyance Systems

Performance Testing of High-Pressure Axial Flow Fans in Sawdust Conveyance Systems

The performance of high-pressure axial flow fans affects mechanical performance. This performance is reflected in parameters such as airflow, total pressure, output, and efficiency. When one or more of these parameters are modified, the performance is also altered. The performance of high-pressure axial fans is difficult to determine theoretically, as the theoretical models are incomplete; experimental testing is required to establish their performance. Performance testing involves varying the airflow of the high-pressure axial fan while measuring various performance parameters under constant speed conditions. Today, taking the performance testing of high-pressure axial fans in sawdust conveying systems as an example, the replacement method is generally employed. First, data consisting of three components—on-site data, motor data, and label data—is collected and entered. On-site measurement data primarily includes atmospheric pressure, ambient temperature, dry-bulb temperature, wet-bulb temperature, static pressure, dynamic pressure, and 16 other parameters (including speed and airflow area). The main electrical data shows a voltage of 360 V and a current of 32 A. When measuring standard motor data, the high-pressure axial fan must be connected to the motor via a belt drive. The rated power is 19 kW, the motor has 4 fixed windings, and the motor model is Y170H-3. Based on the above data, the plane pressure can be calculated as the sum of atmospheric pressure and plane static pressure. The plane flow rate is calculated by multiplying the plane velocity by the plane area. The motor load factor is the measured current divided by the rated current, where the measured current is the average value. The power of the high-pressure axial fan is calculated by subtracting the motor’s power from the actual output power. The actual output power is 0.05 times the rated power. According to Figure B-4 in Appendix B, the estimated operating loss is 5%. Through the above steps, converted data can be obtained, including important parameters such as the high-pressure axial fan’s airflow, static pressure, and power. In this way, a single performance test can yield multiple datasets for analysis or reference.