Computation Method of Critical Aerodynamic Coefficients in the One-dimensional Flow Model for the Train Tunnel Pressure Wave
Abstract
The one-dimensional flow model is an effective method to study the train tunnel pressure wave problem. Critical aerodynamic coefficients (pressure loss coefficient of the streamlined head, friction coefficient of the train body, pressure loss coefficient of the streamlined tail) are the main factors that affect the computational accuracy of the one-dimensional flow model. In the present paper, the computational formulas of the pressure loss coefficient of the streamlined head, friction coefficient of the train body, pressure loss coefficient of the streamlined tail are derived, which show the relationship among critical aerodynamic coefficients and typical pressure increments. Typical pressure increments are computed by the three-dimensional flow model. Computational results show that, for the high-speed train studied in the present paper, the pressure loss coefficient of the streamlined head is 0.0149, the friction coefficient of the train body is 0.0040, and the pressure loss coefficient of the streamlined tail is 0.0151. The computational difference between the onedimensional flow model and three-dimensional flow model is no more than 5%, which verifies the accuracy of critical aerodynamic coefficients.
DOI
10.12783/dtetr/icia2017/15657
10.12783/dtetr/icia2017/15657
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