Numerical study of the influence of bladed part parameters on the characteristics of a hydrodynamic retarder

Introduction. In the modern world, in order to increase the mobility and traffic safety of vehicles, as well as to increase the service life of brake mechanisms, a wear-resistant brake system is widely used on heavy wheeled vehicles, which makes it possible to provide service deceleration of the vehicle without the use of friction brakes. One of the main units that make up such a deceleration system is a hydrodynamic retarder, the study of the characteristics of which is devoted to this work.

Objective. Providing a given mechanical characteristic of a hydrodynamic retarder by optimizing the blade part.

Methodology and methods. To study the influence of the parameters of the bladed part on the characteristics of the hydrodynamic retarder, CFD methods are used to determine the values of the dynamic/energy characteristics of the flow in the interblade space of the hydraulic brake, considering the influence of the geometric features of the flow path, as well as the physical and mechanical properties of the working fluid. Within the framework of the article, a finitevolume model of the fluid part of the hydraulic brake was created in the Ansys Fluent software package, and the dependence of the characteristics of the hydraulic brake on the internal elements of the blade part was analyzed: the number of blades, the angle of inclination of the blades, the shape of the fluid part.

Results and scientific novelty. The presented approach allows iteratively to carry out the synthesis of hydraulic brake impellers. At the same time, the obtained results of the study on the influence of the angle of inclination, the number and shape of the blades on the torque coefficient of the hydraulic brake make it possible to rationally choose the initial approximation and reduce the number of iterations.

Practical significance. Data on the influence of the parameters of the flow path on the characteristics of the hydraulic brake make it possible at the design stage to evaluate the possibility of creating acceptable designs of hydrodynamic retarders for use on wheeled vehicles.

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