| 摘要 |
<p>A pulsating device 10 has a chamber 18 for receiving liquid entering the device 10 and gas 26 that that occupies an initial volume in the chamber 18. The liquid entering the chamber 18 compresses the gas 26 and decreases the volume that the gas 26 occupies in the chamber 18 and increases the pressure in the chamber 18. A valve 16 of the device 10 opens above a first threshold pressure to begin a pulse and then closes below a second threshold pressure Pc to end the pulse. Also the device 10 has an outlet gate 28 that permits liquid in the chamber 18 to exit the chamber 18 as long as the pressure in the chamber 18 at the outlet gate 28 is above zero.</p> |
