Application of the Numerical Aerodynamic «Blowing» Method to Determine the Required Number of Speed Sensors and the Method of their Placement in Special Ventilation Ducts

This paper is devoted to substantiating the choice of the number and location of velocity sensors based on three-dimensional modeling of air flow in the elements of the ventilation system. The location and number of speed sensors, depending on the geometric parameters of the ducts, are regulated by GOST 12.3.018-79 and GOST 8.361-79, based on empirical models of air flow in channels of various shapes. In real conditions, these requirements may not always be met. The location of the sensors often has to be chosen based on ease of use rather than aerodynamics. Based on these considerations, the location of the velocity sensors in the ventilation system element was chosen based on three-dimensional modeling of the air flow. The purpose of the work is to calculate the number of sensors and their location, and to prove its correctness. The goal is considered achieved if the average values of the flow velocity at the sensor locations differ from the average values of the velocity in the corresponding sections by no more than 10%. The calculations performed made it possible to select the optimal number and location of air velocity sensors. As a result, deviations from the average cross-section value do not exceed 5%. Thus, the validity of the proposed number of sensors for measuring flow velocity and their installation locations in a complex ventilation system is shown.