In order to explore the influence of the change of the hole area of the static rotor on the performance of the orifice disc hydraulic dynamometer,the internal flow process of the existing orifice disc hydraulic dynamometer under different hole area conditions was analyzed by numerical calculation,the flow field and temperature field inside the hydraulic dynamometer chamber were obtained,and the changes of parameters such as temperature difference,flow rate,torque and absorbed power at the inlet and outlet of the hydraulic dynamometer were compared.The results show that the increase of the static rotor bore area will lead to the increase of the temperature difference between the inlet and outlet of the hydraulic dynamometer,and the relationship is roughly linear,while the change range of the flow rate is small,which is maintained within 20%.The torque and absorbed power increase with the increase of the hole area,the increasing range gradually decreases,and the influence of the change of the hole area is constantly weakened.
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