System identification of thermodynamic process for the air chamber of hydraulic ram pump
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Abstract:
Based on the ex per iments conducted on the independently innov ativ e hydraulic ram pump, t he impacts of cer tain key facto rs, such as thermodynamic pr ocess and water level fluctuatio n of the air chamber, on t he hydraulic ram pump wer e studied. The sy stem identificat ion method of the thermodynamic pro cess for the air chamber was pro po sed. With the sy stem ident ifica2 tion of the measur ed r esult s, the variation o f po ly tro pic ex po nent k w as analyzed. T he r esults show ed that t he polytr opic ex po2 nent k of the t hermodynamic pr ocess is betw een 1. 0, indicating the isot hermal pr ocess, and 1. 4, indicating the adiabat ic pro cess, and is usually less than 1. 2, which decreases w ith the increasing of the delivery head.When t he deliver y valve is closed, water in the air chamber can flow back into the pump body to lower the deliv ery flow . Thr ough the impr ovement of the o pen2close char2 acter istics of the deliver y v alv e, the backflow can be reduced and the hy dr aulic perfo rmance of the hydraulic ram pump can be pr omot ed.
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