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

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.