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本文提出一种用于调节低速风洞流速的测量及控制系统。该系统以微计算机为核心,不断采集风洞实验段的流速数据,并根据测量结果与指定值的比较去调节和控制风洞的电机转速,使风洞能准确地按指定风速运行或按予定的程序升速或降速,实现了低速风洞的闭环自动调速。本文给出了该系统的构成原理和性能实验结果。测试结果表明,本系统的超调量小于5％,稳态误差小于0.3％,调节时间小于50秒。
This paper presents a measurement and control system for regulating the velocity of low velocity wind tunnel. The system uses microcomputers as the core and continuously collects the flow velocity data of the wind tunnel experiment section and adjusts and controls the motor speed of the wind tunnel according to the comparison between the measured result and the specified value so that the wind tunnel can accurately operate according to the specified wind speed or according to the predetermined wind speed Speed up or down the program to achieve a low-speed wind tunnel closed-loop automatic speed control. In this paper, the composition of the system principle and performance experimental results. The test results show that the system overshoot less than 5%, steady-state error of less than 0.3%, the adjustment time of less than 50 seconds.