一种基于燃烧器的热风洞控制系统设计与验证

目的 研究一种基于燃烧器的热风洞控制系统，重点对其空气流量及温度控制开展研究。方法 对于暂冲式气源，压力持续下降容易导致流量不稳定，而流量对温度控制存在耦合关系，因此提出基于解耦的双回路PID控制策略。针对大流量气路调节阀动态特性差的问题，提出带辅助气路的双路协调控制策略。通过AMESim和MATLAB联合仿真，建立热风洞试验系统的模型，分析热风洞控制系统的动态特性。基于cRIO平台构建控制器，对热风洞开展实际的控制试验。结果 空气流量稳态误差不大于2%，温度波动不大于1%，稳定时间>25 s，达到了热风洞设计和使用要求。结论 空气流量、燃油流量等因素均对出口温度有较大影响，采用空气流量和温度的综合控制策略，能够实现空气流量控制及在不同空气流量下的温度控制，并维持较长时间的稳定状态。

Design and Verification of a Burner-based Hot Wind Tunnel Control System

This paper is to research a burner-based hot wind tunnel control system, focusing on its airflow and temperature control. For transient air source, the continuous drop in pressure tends to lead to flow instability, and there is a coupling relationship of flow to temperature control, so a decoupling-based dual-loop PID control strategy is proposed. Aiming at the problem of poor dynamic characteristics of the large-flow air circuit control valve, a dual-circuit coordinated control strategy with an auxiliary air circuit is proposed. Through the joint simulation of AMESim and MATLAB, the model of the hot wind tunnel test system was established and the dynamic characteristics of the hot wind tunnel control system were analyzed. A controller was built based on the cRIO platform, and practical control experiments were carried out on the hot wind tunnel. The test results show that the steady-state error of airflow is not greater than 2%, the temperature fluctuation is not greater than 1%, and the stabilization time is > 25 s, which meet the design and use requirements of the hot wind tunnel. Factors such as airflow and fuel flow etc. have a large impact on the outlet temperature. The integrated control strategy of airflow and temperature can achieve airflow control and temperature control under different air flows and maintain a stable state for a long period of time.