Numerical Simulation Analysis Of Cross-saddle Light Rail Transit Sector Tunnel Jet Ventilation And Fans Installation Parameters Optimization

Along with the question prominent of the worldwide traffic congestion,environmental pollution and energy crisis.Because of the characteristic of security,comfort,rapid,fiducial point,large seating capacity,lower energy consumption and low pollution.Light Rail Transit receives more and more favor.People also begin to pay more attention to the problem of sector tunnel environment quality.So the Paper aims at Carrying on the optimized analysis of the ventilation system of cross-saddle single-track sector tunnel,exploring the parameter of sector tunnel ventilation system of reasonable,scientific,energy-saving and economic.The paper take city cross-saddle single-track sector tunnel as object of study,according to the characteristic and request of tunnel longitudinal jet ventilation,on the basis of theoretical analysis,conducts the numerical simulation research to flow quality of air in the single-track cross-saddle sector tunnel with the application of Computational Fluid Dynamic (CFD)software.Main research content includes following several aspects:â‘ Cross-saddle single-track sector tunnel longitudinal jet ventilation system numerical simulation analysis 1) Three small power fans combination jet ventilation simulation and analysis; 2) Two large power fans combination jet ventilation simulation and analysis; 3) The influence of the distance between fans and tunnel wall makes on air flow quality; 4) The influence of the distance between fans makes on air flow quality;â‘¡Chongqing cross-saddle single-track LRT jiefangbei sector tunnel longitudinal jet ventilation system numerical simulation analysis and fans installation parameter optimization.The research mentality of the Paper:First of all,according to the characteristic of air flow field in the sector tunnel,build the mathematics,physics model suits in solution to aerodynamics characteristics and corresponding numerical calculus method;Apply the mathematics model and numerical calculus method through confirmation in actual project to cross-saddle single-track sector tunnel longitudinal jet ventilation system,calculate jet fans pressure balance under different working conditions in the tunnel,and analyze the pressure field and velocity field in the tunnel.Based on this,study and analyze characteristic of ventilation system under normal operating conditions,select the most reasonable fans installation parameter,make the airflow regulation of jet fans on the air in the tunnel more reasonable.And carries the confirmation and optimization on practical engineering design scheme,Thus,make the ventilation design scheme serve the purpose of energy-saving and reasonable.The paper obtains few small power fans and more large power fans combination respectively influence on airflow quality in the tunnel through theoretical analysis and numerical simulation calculus;relations between airflow quality and distance of jet fans and tunnel wall;relations between airflow quality and upper and lower distance of jet fans.Target-oriented summarize the relations between internal airflow quality of cross-saddle single-track LRT sector tunnel and fans installation parameter.And make numerical simulation analysis on Chongqing cross-saddle single-track LRT jiefangbei sector tunnel longitudinal jet ventilation system,carrie optimization on the ventilation design scheme,give the reasonable fans installation parameter suggestion.Provide the theory basis for later cross-saddle single-track LRT sector tunnel longitudinal jet ventilation system design.