Research on Calculation Methods for Internal Pressure in High-speed Trains Using Passive Pressure Control Technology
Existing calculation methods for calculating the internal pressure in high-speed trains using passive technology do not consider the actual working state of pressure protection valves and the influence of duckbill foramens,which hin-ders accurate prediction of the internal pressure during tunnel passage.This approach is detrimental to accurately predic-ting the interior pressure of the train during its tunnel traversal as well as the formulation of technical conditions for con-trolling the opening and closing of pressure protection valves.Based on the impact characteristics of passive pressure pro-tection valve control and the opening and closing of air conditioning duckbill foramen on the airtightness of the train body,this paper established a calculation method for internal pressure of trains passing through tunnels.By using a one-dimensional compressible unsteady non-isentropic flow model and obtaining the external pressure through the Riemann variable characteristic line method,this paper analyzed the opening and closing characteristics of pressure protection valves in the case of a single train passing through short,medium-long,long,and extra-long tunnels,and compared and analyzed the differences between existing methods for calculating internal train pressure and the method proposed in this paper for predicting internal pressure changes in the case of a single train passing through a tunnel.Finally,the pressure comfort index values inside the vehicle were analyzed based on the standard limits of pressure comfort.Research shows that the calculation method in this paper,which is reasonable and feasible,not only accurately reflects the change pat-terns of internal pressure in high-speed trains using passive techniques but also provides a solid aerodynamic basis for the development of pressure protection valve opening and closing control technology.
high speed trainstunnel pressure waveinternal pressurepassive pressure control technologypressure pro-tection valveduckbill foramen
NETL
NSTL
万方数据
