A Dynamic Model Method and Its Application for Measuring the Air Resistance Coefficient of High-Speed Train Tunnels
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A technology of tunnel air and drag coefficient, which is used in aerodynamic tests, measuring devices, and testing of machine/structural components. Simple operation and high measurement accuracy
Active Publication Date: 2016-08-17
中氢(湖南)氢能装备有限公司
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However, because it cannot simulate the relative motion between the train, air, ground and tunnel, it is impossible to simulate the process of the train passing through the tunnel in the wind tunnel experiment, and it is impossible to use the wind tunnel to measure the drag coefficient of the train passing through the tunnel.
[0005] Therefore, at present, at home and abroad, there is still no effective experimental means to measure and evaluate the resistance coefficient of trains passing through tunnels at the design stage
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Embodiment 1
[0079] On the high-speed train dynamic model test platform, test the air resistance coefficient of the intercity EMU model, the specific steps are as follows:
[0080] a, the EMU model is the model of the 1:16.8 intercity EMU with 3 sections, and the quality is 23 kilograms. The EMU model is placed on the rail of the dynamic model test bench with tunnel, and connected with the acceleration mechanism;
[0081] b. The tunnel of the dynamic model test bench with tunnel is 50 meters long, and a light reflection belt with a length of 73 meters and a width of 2cm is set between the two tracks; the length of the light reflection belt is 20 meters before the tunnel entrance, and the tunnel 3 meters behind the exit; the light reflection belt is composed of a group of black line segments with a length of 10cm and a group of white line segments with a length of 10cm alternately connected in black and white; the black segment is required to be darker in color, with a rough surface, and try...
Embodiment 2
[0101] It is basically the same as Embodiment 1, except that a real vehicle is used.
[0102] The calculation method for calculating the air resistance coefficient of the tunnel is as follows:
[0103] Substitute the mass, velocity and acceleration of the tested train into Newton's second law formula and Davis empirical formula:
[0104] Newton's second law formula: the total resistance of the tested train = the mass of the tested train × acceleration
[0105] Davis empirical formula: the total resistance of the tested train = tunnel air resistance + wheel-rail friction resistance + resistance caused by ventilation such as air conditioning; among them,
[0106] Tunnel air resistance = 0.5 × air density × square of speed × cross-sectional area of the tested train × tunnel air resistance coefficient;
[0107] Wheel-rail frictional resistance: proportional to the mass of the actual vehicle;
[0108] The resistance caused by the ventilation of the air conditioner: it is direc...
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Abstract
The invention discloses a dynamic model method for measuring a tunnel air resistance coefficient of a high speed train and application of the dynamic model method. The dynamic model method comprises the steps of preparing site equipment, collecting data, drawing a speed curve, drawing an acceleration curve and computing the tunnel air resistant coefficient. The main steps are as follows: placing a motor train unit model on a dynamic model experiment platform and enabling the motor train unit model to be connected with an accelerating mechanism; setting a light reflection zone; installing a photoelectric detector; installing a data collecting device; connecting a computer when the motor train unit model is in a stop state; when the motor train unit model runs to a set distance in front of a tunnel entrance at a set primary speed, enabling the motor train unit model to begin to slide freely and pass through the tunnel until the motor train unit model stops; emitting visible light to the light reflection zone and receiving and storing reflection light signals by the photoelectric detector; and drawing the speed curve and the acceleration curve and computing the tunnel air resistance coefficient by placing the quality of the motor train unit model, the speed of the motor train unit model and the acceleration of the motor train unit model into the newton second law formula and the Davis empirical formula.
Description
technical field [0001] The invention relates to a dynamic model method for measuring the air resistance coefficient of a high-speed train tunnel and its application. Background technique [0002] As the speed of the train increases, the resistance of the train continues to increase, and the proportion of air resistance is increasing. Since the train air resistance is proportional to the square of the train speed, when the train speed reaches 200km / h, the train air resistance accounts for about 70% of the total train resistance; when the train speed exceeds 300km / h, it accounts for more than 85%. Therefore, it is a key technical issue in the construction of high-speed railways to improve the aerodynamic performance of trains and achieve drag reduction and energy saving by streamlining the car body. [0003] In the process of developing high-speed railways and developing high-speed trains at home and abroad, a lot of research has been done on the methods of measuring train ai...
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