Study On Influence Of Curvature Effect On Air Distribution Of Circular Column Attachment Ventilation

With the development of construction technology and the demand for economic progress,buildings of large space have emerged in the civil and industrial fields.And the indoor environment has always been affecting the quality of production of labor and machine production efficiency in these spaces.Therefore,in order to improve the social production efficiency and create a more comfortable environment,Mixing Ventilation and Displacement Ventilation are used for indoor environmental regulation in large space,which are suitable for different occasions.However,the above ventilation methods still have some disadvantages in ventilation efficiency and space usage in large space.Based on the characteristics of the building structure and the theories of various attached jet flow,a new type of air supply mode known as Wall-Column(cylinder,square)attached ventilation is proposed.This paper focuses on the effect of curvature on Air distribution characteristics of Circular Column Attachment Ventilation systematically.This paper uses full-scale experimental data to verify the applicability of the RSM turbulence model in the study of circular column attachment jets.Afterwards,the width of the air supply slot outlet that can produce effective attachment under different cylindrical radius/ curvature is analyzed by numerical simulation,and a selection chart of the limited attached curvature is given.Then the influence of the installation height of slot outlets and the width of inlets on this new ventilation mode is studied.And under a single cylinder,the influence of the size of the room and the diameter of the column on Circular Column Attachment Ventilation is analyzed.The results show that the average speed in occupied zone gets smaller and smaller with the installation height of the inlet increased.However,the speed mentioned above will increase when the width of the air supply slot outlet is increased.Meanwhile,It is noteworthy that the installation height and width of the slot outlet will not change the axis jet velocity distribution.Finally,the uniform calculation formula of axial velocity,formula of extended thickness and the cross flow distribution is proposed.Although the size of the occupied zone and the radius of the cylinder have less influence on the non-dimensional axis velocity distribution of the jet flow,they can affect the velocity distribution of the occupied zone more.Therefore,it needs to be comprehensively considered in design.This paper has refined the theory of Circular Column Attachment Displacement Ventilation and gave a unified calculation formula combined with various influencing factors.And The influence of room size and column diameter on Circular Column Attachment Ventilation has been also investigated.This paper laid the theoretical foundation for engineering design of the Circular Column Attachment Ventilation.