Railway vehicle air resistance calculation method based on numerical simulation

Abstract

The invention relates to a railway vehicle air resistance calculation method based on numerical simulation. The method comprises the steps that a model needed by numerical simulation is established, and grids are divided; analogue simulation is performed, the air resistance coefficient of the vehicle is corrected according to the air pressure difference resistance and the air friction resistance of the rail vehicle; and according to the corrected vehicle air resistance coefficient, a vehicle air resistance rapid calculation formula is constructed and the vehicle air resistance rapid calculation formula is verified. According to the method, numerical simulation calculation is carried out on the numerical value of the air resistance borne by a common rail vehicle model moving under typical working conditions, calculation of the middle vehicle differential pressure resistance, the tail vehicle differential pressure resistance and the whole vehicle air friction resistance is added, and thevehicle air resistance coefficient is corrected. Defects in an existing air resistance calculation formula are overcome, and the accuracy of the air resistance calculation formula is improved, so that the air resistance calculation formula is suitable for vehicles with large slenderness ratios, such as railway vehicles.

Description

technical field [0001] The invention belongs to the technical field of vehicle air resistance calculation, in particular to a numerical simulation-based calculation method for rail vehicle air resistance. Background technique [0002] The level of traction energy consumption is closely related to the resistance of rail vehicles. When a vehicle is running, one of the resistances to be overcome is air resistance. As the vehicle speed increases, air resistance gradually becomes the most important driving resistance. Appropriate vehicle air resistance calculation methods are very important for analyzing the running conditions and vehicle performance of rail vehicles, as well as the later improvement of rail vehicles. However, in the existing air resistance calculation methods, the wind tunnel test and coasting test have certain limitations. Usually, after the development of the vehicle model is completed, the test is carried out on the existing vehicle model, which cannot guid...

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Problems solved by technology

However, in the existing air resistance calculation methods, the wind tunnel test and coasting test have certain limitations. Usually, after the development of the vehicle model is completed, the test is carried out on the existing vehicle model, which cannot guide the power matching in the early development process of the vehicle model. ; and the existing air resistance calculation formula has a large error, which is generally applicable to long and small vehicles such as cars. The air resistance calculation is only related to air density, windward area, running speed and front shape, and does not reflect important factors such as vehicle length. Therefore, it is impossible to directly calculate the air resistance of rail vehicles

[0003] Therefore, the existing wind tunnel test and coasting test are not suitable for the calculation of the air resistance of rail vehicles. It is necessary to design a calculation method for the air resistance of rail vehicles considering the influence of factors such as vehicle length and vehicle type.

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