大型结冰风洞热流场符合性验证

The compliance verification of thermodynamic flowfield in the large icing wind tunnel

大型结冰风洞热流场符合性是大型结冰风洞适航应用的前提条件。为验证中国空气动力研究与发展中心3 m×2 m结冰风洞热流场符合性,建立了结冰风洞热流场符合性验证方法;针对主试验段构型,开展了热流场符合性验证试验,考察了试验段气流总温、试验段气流速度和喷嘴干空气射流对热流场空间均匀性和时间稳定性的影响,获得了试验段气流总温修正关系,形成了3 m×2 m结冰风洞主试验段热流场控制包线。结果表明:基于目前制冷系统性能,降低气流总温和提高气流速度会减弱试验段热流场空间均匀性,但对气流总温时间稳定性并无显著影响;喷嘴干空气射流会提高试验段气流总温,但对试验段模型区内热流场品质并无显著影响;在主要试验条件下,3 m×2 m结冰风洞热流场品质基本满足SAE ARP 5905-2003要求。

The compliance of thermodynamic flowfield in the large icing wind tunnel is the precondition for the airworthiness application of the large icing wind tunnel.In order to verify the compliance of the thermodynamic flowfield in the CARDC icing wind tunnel,a verification method is established firstly,and then a verification test is conducted for the main test section.The influences of the test section total temperature,velocity and the nozzle dry air jet flow on the spatial uniformity and temporal stability of thermodynamic flowfield are examined,and the correction relationship of the test section total temperature is obtained.Finally,the thermodynamic flowfield operating envelop is built.Results show that decreased test section total temperature and increased test section velocity could reduce the spatial uniformity of the thermodynamic flowfield in the test section for the actual refrigeration system of the CARDC icing wind tunnel,but have no obvious effects on the temporal stability of the thermodynamic flowfield.The nozzle dry air jet flow could increase the test section total temperature,while it has no significant influence on the spatial uniformity and temporal stability of the thermodynamic flowfield.The quality of the thermodynamic flowfield of the CARDC icing wind tunnel in the main test section almost meets the requirement of SAE ARP 5905-2003 under the main test condition.