Research of fluid dynamics processes in the presense of cavitation in volumetric hydromachines
The article presents the results of calculations of fluid dynamics characteristics of humid air bubbles which are contained in fluids of hydraulic systems and kept under pressure between 0,13 and 0,69 MPa. For the calculations was used mathematical model of the hydroerosive weardescribing «diesel-effect» under adiabatic compression of air bubbles with a corresponding increase in temperature. The analysis of calculated velocities of steam bubbles blows on the working surface of the hydraulic machine indicated that maximum values of the velocities (at a humidity of 80% and content of the air phase is 5% (by volume) are of the order of 370 m/s and the most troublesome pressure under these conditions is 0,25 MPa and above. The characteristics presented in the article may be useful in the design and operation of hydraulic machines.