Ground parameters of working standard of reproduction of small speeds of air stream

¹ Institute of Geotechnical Mechanics named by N. Poljakov of National Academy of Sciences of Ukraine, 49005, Dnipro, Simferopolska Str., 2a, Ukraine
² DTEK, 01032, Kyiv, Lva Tolstoho Str., 57, Ukraine

^* Corresponding author: dudnik1963@gmail.com

Abstract

As a working standard for research in the area the lowest air velocity can be used a rotary stand. In Ukraine it was not standard measuring instruments of low speeds of air flow. Used Ukrmetrteststandart the Pito-Prandl model pressure tube has a precision class of 0.5, but the range of measurements start only with 5 m/s. In the Institute of Geotechnical Mechanics named by N. Poljakov of National Academy of Sciences of Ukraine was developed, created and perfected the standard stand RESVP-1, which allowed the creation of small air velocities. The considered method of aeromechanical measurements at low velocities of air flow provides the possibility of a very accurate setting of the speed of the crowding airflow affecting to the object under study, since in this case it is a linear velocity of movement the object being studied in motionless air. In the crowding flow affecting the object under study, no pulsations and vortices distorting the measurement results. Standard RESVP-1 is certified by standardization bodies Ukraine in the range of values of reproducible speeds from 0.000 to 1.200 m/s with the permissible value absolute error +(0.001 + 0.003V), where V is the reproducible flow velocity, m/s.