导航

ACTA AERONAUTICAET ASTRONAUTICA SINICA ›› 2020, Vol. 41 ›› Issue (10): 123879-123879.doi: 10.7527/S1000-6893.2020.23879

• Fluid Mechanics and Flight Mechanics • Previous Articles     Next Articles

Airworthiness application compliance verification of cloud flowfield in large icing wind tunnel

GUO Xiangdong, ZHANG Pingtao, ZHAO Zhao, LAI Qingren, GUO Long   

  1. Key Laboratory of Icing and Anti/De-Icing, China Aerodynamics Research and Development Center, Mianyang 621000, China
  • Received:2020-02-18 Revised:2020-03-23 Published:2020-03-20
  • Supported by:
    National Basic Research Program of China (2015CB755800)

Abstract: The compliance of the cloud flowfield of large icing wind tunnels is the foundation of their airworthiness application. To verify the compliance of the cloud flowfield of the 3 m×2 m icing wind tunnel, a verification method based on SAE ARP5905 is firstly developed, followed by a verification test on the main test section, from which the fitting relationships of droplet sizes and liquid water content are obtained. In addition, the effect of the nozzle water pressure, droplet sizes, test section velocity and nozzle number on the test section liquid water content are examined. Finally, the icing cloud operating envelop is built for the main test section. Results show that the distribution of droplet sizes is unimodal and the simulation range is approximately from 10 to 75 μm. Furthermore, the liquid water content in the center of the test section increases as the nozzle water pressure and Median Volume Diameter (MVD) increase, while approximately inversely proportional to the test section velocity and proportional to the nozzle number. Increased nozzle water pressure and nozzle number would enhance the spatial uniformity of the cloud liquid water content in the test section; however, increased test section velocity could reduce the spatial uniformity of the cloud. Moreover, although the icing cloud operating envelop of the 3 m×2 m icing wind tunnel for the main test section could cover most of the icing atmospheric conditions listed in Appendix C, Part 25 of FAR, limitations still exist for simulations under low liquid water content conditions.

Key words: aircraft icing, icing wind tunnel, main test section, cloud flowfield, airworthiness application

CLC Number: