The paper is devoted to the analysis of reducing friction losses in rotary vane machines. Three options for cylinder lubrication are considered: lubrication with water, oil and friction in the absence of lubricant. As a result of experimental studies, the dependence of the friction power and the coefficient of friction on the rotor speed in the range of 950÷4700 rpm was revealed. It is found out that the lowest friction losses are provided by the lubrication of the cylinder with water, while the values of the friction coefficient obtained during the processing of the results indicate the presence of a hydrodynamic lubrication mode. Unexpectedly large values of power losses on friction were obtained in the case of using oil as a lubricant, the level of which is comparable to the conditions of dry friction of the vanes against the cylinder wall. The analysis of the values of friction power and friction coefficient during oil lubrication has shown that a significant part of power losses is resulted from hydro-mechanical losses, which, according to preliminary estimates can reach 70%, which indicates the need to reasonably choose the type of oil and its quantity supplied to the working chamber of the rotary vane machine.
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