| Citation: | CHEN J C，YANG X，MA Y X，et al. Model-free adaptive cascade control for temperature system of a hot wind tunnel[J]. Journal of Beijing University of Aeronautics and Astronautics，2024，50（5）：1713-1720 （in Chinese） doi: 10.13700/j.bh.1001-5965.2022.0528
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For the dynamic calibration of high-temperature thermocouples, the thermal strength test of aero-engine blades, and other application scenarios, the thermal wind tunnel can offer a well-distributed and stable temperature field. How to control the thermal flow generated by thermal wind tunnel in a wide temperature range is a difficult problem. Therefore, the mathematical models of fuel flow rate and combustor temperature in hot wind tunnel are established. A cascade control method is designed, in which the inner loop is incremental proportional integral derivative （PID） and the outer loop is model-free adaptive control (MFAC). The incremental PID controller controls the fuel flow rate, and the MFAC controller is used to control the combustor temperature, which can effectively control the temperature of the combustor. A comparison test between the classic cascade PID control method and the cascade FuzzyPID-PID control method is conducted, along with numerical simulation and experimental analysis of various target temperatures. The experimental results confirm the feasibility and superiority of the proposed control scheme.
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