Experimental Regulating Parameters of Bladder-Type Hydraulic Accumulator

Abstract

Experimental regulating parameters of the non-stationary expansion of air inside a bladder-type hydraulic accumulator, working with the simple short pipeline, are presented in the paper. The technique of continuous online monitoring of changes in time of volume and absolute air pressure inside the hydraulic accumulator during the discharge process has been improved. Three series of experimental studies of transient gas processes inside the accumulator at different values of the average volume flow rate are made. Tendencies of change of the integral parameters of the hydraulic accumulator are obtained and analyzed depending on the serial number of the discharge cycle. A general dependence of dimensionless storage volume Kreg on the polytropic index n in series # 1–3, approximated by single power-law dependence, is obtained. The systematic changes of integral parameters in each subsequent discharge cycle can be explained by the non-stationary transient thermodynamic processes in air inside the accumulator until the thermodynamic equilibrium with the ambient air parameters is reached.

Study on the Effect of Hydraulic Energy Storage on the Performance of Electro-Mechanical-Hydraulic Power-Coupled Electric Vehicles

“…If the number of batteries is increased in order to increase the range of pure electric vehicles, this will not only increase the equipment mass of the vehicle but also further compress the available space inside the vehicle, which does not meet the practical application requirements [5]. A hydraulic power storage system is used for vehicle start-up acceleration or regenerative braking because of advantages such as high-power density and fast energy conversion [6]. This is undoubtedly a good choice, but an increase in hydraulic energy storage, hydraulic power conversion, and other devices will again make the powertrain structure lose.…”