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				  Working liquid compressibility may considerably change the values and proportions of  coefficients of the volumetric and mechanical energy losses in the displacement pump used  in a hydrostatic drive system. This effect can be particularly seen in the operation under  high pressure and also in the system, where aeration of the working liquid can occur. In  the Part II the mathematical model is presented of the torque of mechanical losses in the  pump and its laboratory verification. Conclusions are drawn regarding the effect of working  liquid compressibility on the mechanical and volumetric losses in the pump. 				

polish maritime research

Effect of the working liquid compressibility on the picture of volumetric and mechanical losses in a high pressure displacement pump used in a hydrostatic drive part ii mechanical losses in a pump