Abstract
A gas wave ejector (GWE) is an efficient energy conversion technology. This study innovatively proposes a new type of curved diverging channel (Sp-ch channel) and performs a relevant comparative fluid and thermodynamic analysis. The flow losses of the incident high-pressure gas and the medium-pressure gas in the pressure port can be significantly reduced by the bending angles of the Sp-ch channel. The structure of the Sp-ch channel allows the medium-pressure gas to complete a certain degree of dynamic-static pressure conversion in the channels, improving the static pressure ratio of the gas discharged from the rotor. Compared to the traditional rotor, the Sp-ch rotor exhibits a minimum increase of 57% in ejection rate and 5% in efficiency under the comparative conditions in this study. This study established a GWE testing platform in a coalbed methane well site and conducted its first application test, which preliminarily shows the application advantages of a GWE. Under the testing conditions in this study, the maximum ejection rate of GWE reaches to 35.1%, allowing for a maximum recovery production of approximately 8832 Nm3/d from the discontinued low-pressure wells. Moreover, except for overcoming mechanical friction, the GWE operates with almost no power consumption.
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