关键词: 风沙流, 脉动强度, 风洞实验

Abstract: The longitudinal intensity of airflow with sand grain saltation is studied experimentally in a wind tunnel. The experiments were conducted with one test sand and four different stream velocities. The four velocities tested were 8.5, 11.5, 13.5, and 22.5 m·s^-1; measured at the centerline of the test section entrance. The mean grain diameter of the tested sand is 0.35 mm. The measurements show that the longitudinal turbulence intensity of airflow cannot be neglected. The turbulence intensity increase with the rise of stream wind velocity but keep a constant with height. The mean intensity of the turbulence is proportional to the free main velocity. The relative intensity of the turbulence defined as the ratio of turbulence intensity to mean wind velocity decrease with height. For different stream velocities, the relative intensity of the turbulence varies greatly in the near-bed region, and tends to be consistent outside this region.

Key words: air flown, turbulence intensity, wind tunnel experiment