Off-the-shelf variable flow rate water-propylene glycol hydraulics

摘要

A commercially available axial piston water hydraulic pump (Danfoss PAH 10) was evaluated under a range of pressures, speeds and fluid temperatures. Three candidate fluids were used in this evaluation: filtered tap water (as a baseline), a mixture of tap water and polypropylene glycol-based antifreeze, and finally a mixture of synthetic seawater and polypropylene glycol-based antifreeze. The effect of the fluids and temperatures on the pump efficiency was observed. The evaluation provides the basis for the design of a non- polluting variable flow water-antifreeze hydraulic power source.