Abstract
The article presents the findings of theoretical and experimental research on hydraulic processes occurring in the hydraulic drives of transport machines. The paper analyses the influence of hydrodynamic processes on the flow characteristics of fluid considering different hydraulic fitting connections. The performed analysis is based on numerical simulations using Navier–Stokes equations for the velocity field. The dynamics of fluid flow in the hydraulic system has been investigated taking into account the main parameters like system flow rate in the range of 5 to 100 L/min, the diameter of the pipeline making 1/2” and fitting standards DKOL, ORFS, BSP and JIS. As a result, pressure drop, power losses, resistance and flow coefficients at different fitting connections have been obtained. The article compares the provided results with the findings given employing the calculation method for the standard of equivalent length fitting. To simulate fluid flow, a mesh independence study and turbulence calculations have been performed. Simulation results have been examined conducting physical experiments on measuring pressure losses. Each experimental research includes three measurements of connections bearing in mind each fitting standard.
Highlights
A hydraulic system of any modern heavy machinery includes a variety of different assemblies and is considered and simulated as a complex dynamic system while applying multi-criteria methods
The dynamics of fluid flow in the hydraulic system has been investigated taking into account the main parameters like system flow rate in the range of 5 to 100 L/min, the diameter of the pipeline making 1/2” and fitting standards DKOL, ORFS, British standard pipes (BSP) and JIS
With reference to theoretical research on simulating the hydrodynamic processes of different standards of fitting connections and straight pipeline, the obtained results showed that due to changes in the size and configuration of the cross-section area, flow velocity, the separation of transit flow from the walls of the channel and the formation of vortex occur at fitting connections
Summary
A hydraulic system of any modern heavy machinery includes a variety of different assemblies and is considered and simulated as a complex dynamic system while applying multi-criteria methods. The coefficient describes fitting connections the relationship between pressure drop across an orifice, The analysis of fluid flow in hydraulic systems indicates some parameters used for quantifying the efficiency of elements. According to De Moraes et al (2017), a number of methods estimate pressure drop, for example, the method of equivalent lengths, the K or new crane method and the 2Ks method These techniques are based on the premise that pressure drop resulting from each of the fittings is constant depending only on the diameter of that section without taking into account changes in fluid flow. Taking into account time cost and resource simulation, the standard k–ε model is acand compression As for this method, we lack information cepted for investigating a full turbulence flow rate through whether it has had a vortex of fluid inside the HPH-fitting fitting connections. According to Liu et al (2020) investigation into the applied equipment and the cost of five different types of the electro-hydraulic power unit, the smaller pressure drop occurs in the system, the lower is the power cost of hydraulic units
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