Study on the Effect of Oval Tubes on Airflow Turbulence Characteristics in Wind Tunnel Bo Zhao, Cheng Fu, Haitao Pei, Daxiong Liao and Bo Zhu JNWPU, 38 2 (2020) 303-308 Published online: 17 July 2020 DOI: 10.1051/jnwpu/20203820303