3 m×2 m结冰风洞热流场品质提高及评估

结冰风洞热流场品质符合性是大型结冰风洞适航应用的基础。为明晰制冷系统性能升级优化对3 m×2 m结冰风洞热流场品质的影响，开展了热流场符合性验证试验，评估了热交换器出口和试验段两位置处热流场品质，给出了气流总温修正关系，形成了热流场控制包线。结果表明:热交换器出口和试验段模型区内热流场品质在主要试验工况下均优于SAE ARP5905指标；与升级优化前（2019年）试验结果对比，优化后试验段模型区内热流场空间均匀性显著增强，尤其在高风速、低总温工况下，模型区内均未出现超标的非均匀峰值点。结冰风洞制冷系统的升级优化显著扩展了3 m×2 m结冰风洞主试验段热流场控制包线，增强了结冰风洞试验模拟能力。

Improvement and evaluation of thermal flow-field quality in CARDC icing wind tunnel

The compliance of the thermal flow field quality of the large icing wind tunnel is the foundation of its airworthiness application. In order to understand the effects of upgrading of the refrigeration system on the thermal flow field quality in the CARDC icing wind tunnel, a comprehensive verification test is carried out for the main test section. Then, the thermal flow field qualities, both at the exit of the heat exchanger and in the test section, are evaluated. Finally, the correction relationship of the airflow total temperature and the thermal flow field operating envelop are achieved. Results show that the thermal flow field qualities, both at the exit of the heat exchanger and in the test section, are better than the quality index given in SAE ARP5905, under the main test conditions. Compared with the test results in 2019, the spatial uniformity in the model area of the test section is greatly enhanced. Particularly, non-uniform temperature peak points exceeding the standard in the model area are eliminated under the conditions of high airspeed and low total temperature. Finally, the upgrading of the refrigeration system in 2020 greatly extends the thermal flow field operating envelop, so that the temperature simulation capability of the CARDC icing wind tunnel is enhanced significantly.