Investigation on Gas-liquid Dissolved-released Flow and Mass Transfer in a Space Micropump
As a cutting-edge technology,On-orbit refueling technology uses space micropumps to transport gas-liquid mixed fluids,and this high-speed rotating machine affects the gas-liquid mass transfer process.Combining Singhal full cavitation model,Henry's law and reported experiments,we innovatively developed a mathematical calculation model for gas-liquid dissolution and release and applied it into space micropumps.The verification result of plug-discharge flow shown that the difference in dissolved oxygen concentration can achieve an accuracy of less than 2.0％;the average error of the performance characteristics of the micropump between the experiments and simulations is less than 8.1％.The results exhibited that,in the impeller,gas accumulation occurs near the suction surface of the long blade,which is related to the gas evolution.The position of released gas is consistent with the position where cavitation occurs in rotating machinery.When the concentration of the solution is high,the gas release phenomenon makes the mass transfer direction change rapidly,which aggravates the unstable fluctuation of the impeller.The current study provides guidance on the gas-liquid mixed delivery status for on-orbit refueling system.
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