Moving model tests on transient pressure and micro-pressure wave distribution induced by train passing through tunnel. Issue 191 (August 2019)

• Record Type: Journal Article
• Authors: Zhang, Lei; Yang, Ming-zhi; Niu, Ji-qiang; Liang, Xi-feng; Zhang, Jian
• Is Part Of: Journal of wind engineering and industrial aerodynamics. Issue 191(2019)
• Page Start: 1
• Page End: 21
• Publication Date: 2019-08
• Subjects: Moving model test -- High-speed train -- Transient pressure -- Micro-pressure wave -- Pressure distribution; Wind-pressure -- Periodicals; Buildings -- Aerodynamics -- Periodicals; Pression du vent -- Périodiques; Constructions -- Aérodynamique -- Périodiques; Buildings -- Aerodynamics; Wind-pressure; Periodicals
• DOI: 10.1016/j.jweia.2019.05.006
• Languages: English
• ISSNs: 0167-6105

Abstract

Abstract: Using a 1:20 scale moving model device, pressure distributions on train and tunnel surfaces, and the distribution of micro-pressure waves within 50 m of tunnel exits were investigated. In addition, the effects of train speeds on the transient pressures and micro-pressure waves were analyzed. The results revealed that the effect of the train speed on P min values was more significant than that on P max values, on the train surface. Significant differences between symmetrical measurement points located on the same cross section of the tunnel with double tracks could be observed. Moreover, similar differences between symmetrical points located on the same cross section in the streamlined zone of the model train were observed and analyzed. The pressure changes in the measurement points located on the same cross section of the train body, other than the streamlined zone, were approximately coincident. The differences between the P min values of measurement points located on different cross sections of the tunnel determined the differences between the ΔP values of these measurement points. The micro-pressure waves were approximately equal for measurement points located on the same cross section. Moreover, linearity decreased when the distance between the measurement points and the tunnel exit increased. Highlights: Pressure distribution on streamlined zone and the body of train model was measured and analyzed. Pressure distribution on tunnel was measured and analyzed. Distribution of the micro-pressure wave outside tunnel exit was measured and analyzed. Effects of train speed on ΔP values of train and tunnel, and the pressure gradients were analyzed. Effects of train speed on maximum values of micro-pressure wave were measured and analyzed.