Research of cavitation reserve value of a gear-type pump when pumping gas-liquid mixtures
Cavitation reserve coefficient depends on such factors as atmospheric pressure, pressure at the pump inlet, pressure loss at the site between pump inlet and working chamber, fluid temperature. When gas-liquid mixtures are used for a gear-type pump the picture of the absorption process becomes more complicated due to the presence of mechanical impurities in the form of non-dissolved gas bubbles and gas release from the liquid flow because of pressure reduction. When conducting experiments to determine the cavitation reserve coefficient of a gear-type pump the atmospheric pressure was within the limits of 750…760 mm Hg and it was assumed equal to 755 mm Hg. The magnitude of pressure loss ∆p <sub>n</sub> was determined during the cavitation testing of a gear-type pump using non-carbonated liquids (without air supply) and it was proved the same in all the experiments.