Pil'gunov

pp. 12-36

pp. 13-32

pp.9--28

pp. 31-57

pp. 1-23

pp. 1-19

During the research of cavitation processes in the mineral oil flow inside a transparent model of an orifice restrictor steady light emission in the blue range of the visible colour spectrum was revealed. Intensity of light emission grew as the flow velocity increased. Upon reaching the threshold value of the flow velocity, light emission became pulsatile; and when velocity continued to grow, emission stopped. Experiments revealed the presence of mineral oil of intensive electrical processes in the cavitating flow. The created experimental setup allowed to make a quantitative assessment of electric processes and to record the dynamics of light emission. Hypothesis that explains the physics of discovered effects was proposed along with assumptions about possible influence on the working liquid for hydraulic drives and wall materials of narrow channels of hydro automatic equipment elements and devices.  

The aim is to develop a design procedure, creation and study of characteristics of a high-precision wide-range airflow meter - a meter of small linear and angular movements which is built on the basis of an adjustable “flapper-nozzle” orifice. For reading service-differential and power characteristics of the flowmeter a compressor-batcher was used, it provided a stable and deterministic mass flow rate of compressed air. The prototype was a wide-range flowmeter, its experimental characteristics were received. The method of calculation and the experimental data can be used to make pneumatic automation devices.

 The aim of this work is to research bursting strength of mineral-based oil designed to be used as a working liquid for hydraulic drives. Experimental setup on the basis of the mechanism consisting of a pneumatic-drive (pneumatic cylinder) and a vacuum pump (hydraulic cylinder) united by a common arm was created. The author proposes methods of hydrodynamic and burst vacuum extraction for removal of dissolved and undissolved air from the liquid. Quantitative estimation of bursting strength of mineral oil and the influence of degassing depth on it was given.