The Research Of Characteristic Of The Direction Jet Ventilation Of High Way Tunnel

With the rapid development of national economy, the construction of highway has got quite great progress. With highway increasing, more and more tunnel be in construction, especially the tunnel of the length above the three kilometers. The cost of the tunnel ventilation regarded highly, and the power consumption of the system is so much. According to Hunan YanMenJie vehicular tunnels (3785 m), carried out the research of technology for direction jet ventilation technology of highway tunnel, and have designed experiment platform and experiment content.This dissertation surveys the current situation of research on airflow, airflow management and the jet longitudinal ventilation of tunnel system at home and abroad. According to design of YanMenJie vehicular tunnel, carries out research on the aerodynamic characteristic of jet both the fan and the tunnel by theoretical analysis and numerical simulation.By using the fluid dynamic and aerodynamic principle, derivates the basic formula of the jet longitudinal ventilation for the tunnel, provided the theory basis for actual engineering design. Builds the mathematical and physical model of the jet longitudinal ventilation of tunnel system, based on carries out research on theory studies that characteristic of direction jet ventilation.By using technology of CFD numerical simulation that the three-dimensional simulation of the single fan and the tunnel, the dissertation analyzes the aerodynamic characteristic of the jet and velocity and pressure field in the tunnel. This dissertation discusses the confined flow field of oblique impinging jet in a circular tunnel, analyzes the flow characteristic of jet longitudinal ventilation system by theoretic analysis and numerical simulation. And Based on the ventilation design of YanMenJie vehicular tunnel, brought forward the optimization scheme for energy conservation principle.Finally, this research adopts the principle to design the test platform of model, and suggest that tests method and content of the direction jet tunnel ventilation similarity model.