STUDY ON AIR FLOW BIFURCATIONS AND KEY INFLUENCING FACTORS IN ROOMS WITH MECHANICAL VENTILATION SYSTEM
机械通风房间气流分岔及主要影响参数的研究

Air flow bifurcations often occur in a room with mechanical ventilation system, and will change the velocity and temperature fields in the room. The main influencing factors of air flow bifurcations in rooms with mechanical ventilation system are studied in this paper. First, with the jet theory and the results of computer simulation, the paper explains why bifurcation occurs with plane jet but not with centralized jet by analyzing Coanda effect. It is shown that Coanda effect is the main mechanism of bifurcation. Second, the key parameters affecting bifurcations are analyzed using the theory of orthogonal test and variance analysis. The relations between bifurcation intensity and the key factors are obtained.