First, small fans are widely used in aviation, instrumentation and computers. In order to verify whether the aerodynamic performance of the new product meets the design requirements, check whether the performance of the factory ventilator meets the sample data requirements, check whether the ventilator after the transformation can reach the performance index and determine the performance of the ventilator without the signage, etc. Test to obtain its performance curve. By testing the performance of the fan at different flow rates, recording the data obtained, and then processing the data, the fan performance curve can be fitted. The traditional manual measurement method uses manual adjustment of working conditions, manual reading of data, manual data processing and mapping analysis. The workload is large, the adjustment of working conditions is slow, and data maintenance and analysis are difficult. In this paper, the industrial computer is used as the operation station and the upper computer, and a PCL-812 card is used to form the control system. The automatic control mode is adopted, the working condition is adjusted by the computer, the computer collects data for processing and graph analysis, and the automation capability and data management capability are enhanced, and the test efficiency is improved. This paper also gives a new test method and control strategy based on the characteristics of wind turbine performance test. This system implements the GB/T1236-2000 standard and the ISO5801 standard.
Second, the system composition and the various parts of the test system shown in Figure 1, the device includes a computer, PCL-812 card and two intelligent power meter, signal conversion circuit part, test device body part and sensor and other parts. The test device body is mainly composed of a wind chamber, an adjustment damper, an auxiliary fan, a frequency converter and a fan to be tested. The sensor consists of a room temperature and humidity sensor, an atmospheric pressure sensor, a nozzle differential pressure transmitter, a static pressure transmitter and a plenum temperature sensor. The auxiliary fan can be ventilated outwards, controlled by the inverter, and can be set to a certain speed to help simulate the limit of the air resistance of the fan under test. The damper is used to regulate the air flow and obtain the required flow point for testing. The PCL-812 card is a 12-bit A/D and D/A card. The various current and voltage signals of the sensor are processed by the signal conversion circuit and sent to the computer via the PCL-812 card. The control signal from the computer is also sent to the signal conversion circuit by the PCL-812 card, and then output to the regulating damper and the inverter. The smart power meter is responsible for measuring the power of the motor that powers the fan under test. The RS232 serial communication interface is provided on the smart meter, which can directly communicate with the computer for data communication or as a display instrument. The computer is primarily responsible for operating the PCL-812 card and serial communication with the smart meter and processing, analyzing and storing the resulting data. This part of the software functions are implemented by software written in Delphi 5.0 under the Windows 98 operating system.
Third, the test method and control strategy In the traditional manual test, generally after the measured fan and inverter are connected to the power, the inverter is set to a certain frequency, start the auxiliary fan, and then the throttle is closed. The position starts to increase the opening degree to a suitable value, and after stabilization, a set of data is collected. Then increase the opening and measure another point until the required number of points is measured. This test method uses the opening degree of the damper as the basis for adjustment, and collects various data of the fan at different opening degrees of the damper, but the relationship between the flow rate and the opening degree of the damper is nonlinear, so this method is used to determine each It is also difficult to open the damper at the working point. The flow points obtained by this method are relatively random, their distribution is uneven, and sometimes the problem may not be reflected.
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