Laboratory Studies of the Structure of Gas Dynamic Flows

Abstract

The article raises the question of the need to address the issues of improving the design and recommendations for installing exhaust ventilation devices. The analysis of recent studies and publications devoted to the consideration of theoretical and practical aspects of the movement of gas-dynamic flows in ventilation systems and covered in the works of both domestic and foreign scientists is carried out. The main requirements for exhaust ventilation devices are presented. Exhaust ventilation methods are considered. The goals and necessity of conducting experiments to study the influence of nozzles on the formation of air movement are formulated. The design of the stand is presented, on which experiments were carried out in the laboratory of the Department of Heat and Gas Supply, Ventilation and Heat Power Engineering of the National University "Poltava Polytechnic named after Yuriy Kondratyuk". The results of bench tests of various ventilation nozzles for aerodynamic and acoustic performance are presented. Experiments, their analysis and comparison were carried out. The most suitable variant of exhaust ventilation has been selected. The main conclusions are made based on the results of laboratory experiments. The necessity and prospects for further research on the issues raised are proved. The presence of "stagnant zones" for some positions (degree of opening) of the A150 brand of VRF of PJSC "Ventilation systems" is visually traced. Ventilation grille MV 150 PFS manufactured by the same company provides a uniform distribution of the suction spectrum of air in all modes of operation of the fan used. Noise characteristics of the A150 VRF anemostat increase with decreasing living cross-sectional area for air passage, and with its significant reduction, even discomfort occurs due to increased noise level.