Mašiny i Ustanovki: Proektirovanie, Razrabotka i Èkspluataciâ (Feb 2023)
Verification of the mathematical model of the dynamics of the liquid in the flow part of the hydrobrake
Abstract
Introduction. The creation of hydraulic retarders for use in transport equipment (hydrodynamic retarders) is associated with the implementation of the specified mechanical characteristics with the minimum overall dimensions of the product, limited by the cramped layout of the machine. This circumstance requires a wide range of studies on the influence of hydraulic brake parameters, for example, the number and angle of inclination of the blades, the shape of the flow path and the physical and mechanical properties of the working fluid on the implemented mechanical characteristic of the assembly in order to optimize the latter in terms of weight and size parameters.Objective. Verification of the mathematical model of the dynamics of the working fluid in the fluid part of the hydraulic brake, to confirm the calculated data obtained with its help.Methodology and methods. Verification of the developed model was carried out by performing a series of experimental studies using a serial hydrodynamic retarder. To ensure the possibility of a correct comparison, the solid model of the impellers of the hydraulic brake, with the help of which the finite volume model of the flow part of the retarder was created, was obtained using a coordinate measuring machine. During the experiment, a number of stationary operating modes were implemented with different rotor speeds and pressure difference between the inlet and outlet lines of the hydraulic brake. Then the obtained modes were reproduced using the developed mathematical model. The comparison was carried out according to the realized braking torque.Results and scientific novelty. In the course of the studies performed, it was proved that the results obtained using the developed mathematical model of fluid dynamics in the flow part of the hydraulic retarder and in the framework of a full-scale experiment are close. The presented result allows us to consider the developed mathematical model verified and reasonably use it in the study of the influence of various hydraulic brake parameters on its mechanical characteristics.Practical significance. A mathematical model of fluid dynamics in the flow part of a hydrodynamic retarder has been created and verified. The data obtained make it possible to use it in the design of the blade part of the hydraulic retarder to implement the specified mechanical characteristics of the assembly.
