Вісник № 01. Гідравлічні машини та гідроагрегати
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Документ Physical fundamentals of ultrasonic degassing(Національний технічний університет "Харківський політехнічний інститут", 2021) Stryczek, Jaroslav; Antoniak, Piotr; Banas, Michal; Stryczek, Piotr; Jakhno, Oleg; Luhovskyi, Oleksandr; Gryshko, IgorOne of the key benefits of hydraulic system is its rigidity. It lets the signal to be transmitted from the source to the recipient with no loss. Positioning accuracy of actuators significantly depends on the rigidity. The higher the rigidity, i. e. volumetric elasticity modulus, the more accurate performance of hydraulic actuators. The presence of free and dissolved air in liquid is one of the key properties that affect the rigidity. Means of degassing discussed in the paper show a good potential for the mechanical methods, especially for the cavitation technologies. Based on the physical aspects of degassing, the authors recommend to use high- and low-amplitude ultrasonic oscillators to remove air from reservoirs of hydraulic systems. Experiments with degassing of various liquids: water (density ρ = 1000 kg/m3); hydraulic oil (density ρ= 860 kg/m3); engine oil (density ρ= 844 kg/m3) were mainly focused on the amount of extracted air depending on the duration of oscillations. Comparative analysis of degassing velocities at liquid settling technique and ultrasonic degassing technique proved that the latter one has a better potential. A great deal of attention was paid to the problem of the degassing of hydraulic reservoir, directly at suction line of the pump. The removal of dissolved and free air significantly influences the non-cavitational operational mode of the pump. Which, in turn, prevents the equipment from early failure.