Journal Article

Moving Model Test of High-Speed Train Aerodynamic Drag Based on Stagnation Pressure Measurements

Li, Zhiwei, Yang, Mingzhi, Du, Juntao, Huang, Sha, Zhou, Dan

2017

Overview

A moving model test method based on stagnation pressure measurements is proposed to measure the train aerodynamic drag coefficient. Because the front tip of a high-speed train has a high pressure area and because a stagnation point occurs in the center of this region, the pressure of the stagnation point is equal to the dynamic pressure of the sensor tube based on the obtained train velocity. The first derivation of the train velocity is taken to calculate the acceleration of the train model ejected by the moving model system without additional power. According to Newton's second law, the aerodynamic drag coefficient can be resolved through many tests at different train speeds selected within a relatively narrow range. Comparisons are conducted with wind tunnel tests and numerical simulations, and good agreement is obtained, with differences of less than 6.1%. Therefore, the moving model test method proposed in this paper is feasible and reliable.

• Publisher: Public Library of Science,Public Library of Science (PLoS)
• Subject: Acceleration / Aerodynamic drag / Aerodynamics / Analysis / Automobiles / Biomechanical Phenomena / Computer simulation / Drag / Drag coefficients / Dynamic pressure / Education / Ejection / Energy consumption / Engineering and Technology / Experiments / Fluid / Fluids / High pressure / High speed / High speed rail / High speed trains / Laboratories / Laws, regulations and rules / Locomotives / Models, Theoretical / Numerical simulations / Physical Sciences / Pressure / Pressure measurement / Pressure measurements / Railroads / Research and Analysis Methods / Stagnation / Stagnation point / Stagnation pressure / Studies / Test methods / Trains / Transportation / Vehicles / Velocity / Wind tunnel models / Wind tunnel testing / Wind tunnels