In the paper, the influence of pressure pulsations on an indicator diagram as well as the components of overall volumetric efficiency are discussed. Next, an attempt is made to determine a quantitative increment of power demand for compression when induced by pressure pulsations in an outlet pipeline. A way of calculating is explained and the required dependencies are given to determine this increment. The presented theoretical considerations have been verified experimentally using a laboratory test stand specially prepared for that purpose. The results of experimental investigations confirmed the correctness of the theoretical considerations presented.
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