Experimental Integral Regulating Parameters of a Bladder-Type Hydraulic Accumulator

Abstract

Main factors influencing the regulating parameters of gas-charged hydraulic accumulators are thermodynamic processes occurring during the gas compression and expansion. Method of experimental determination of the polytropic index of gas processes in the hydraulic accumulator is improved. An experimental setup was installed for the investigation of integral regulating parameters of the bladder-type hydraulic accumulator. The parameters of non-stationary expansion of the air in the accumulator's shell during its operation with a simple short pipeline are experimentally investigated and analyzed. Polytropic index was regularly decreasing in the cycles #1 to #4 from 2.07 to 1.95. Storage volume of hydraulic accumulator, at the same time, increased on 6.0 % while discharge time decreased on 3.6 %. Obtained experimental trends are explained by the transient thermodynamic processes in the gas inside the hydraulic accumulator before the dynamic equilibrium with the external environment is established.

Experimental Regulating Parameters of Bladder-Type Hydraulic Accumulator

“…Using hydraulic accumulators is useful due to the shortage of the number of pump switches, thus providing the increasing of its service life. Hydraulic accumulators are widely used in engineering: in water supply and other fluid pressure systems (Shi et al [1]; Zhuk et al [2]), in the power engineering (Morozov et al [3]), in hydro-drives (Bravo et al [4]; Kumar et al [5]; Puddu and Paderi, [6]; Wu et al [7]), etc. Parameters of transitional gas processes have a significant impact on the efficiency of the relevant engineering systems (Juhala et al [8]; Mamčic and Bogdevičius, [9]).…”

“…Zhang et al [15] demonstrated the applicability of the Soave-Redlich-Kwong adiabatic equation for gas-charged hydraulic accumulators. Zhuk et al [2], performed a theoretical analysis of gas processes inside the bladder-type water supply hydraulic accumulators widely used in automated pumping stations. A comparison of dimensionless storage volumes of the hydraulic accumulator, obtained for isothermal and adiabatic conditions, as well as for polytropic process with index .…”