Abstract: The capillary performance of porous structure is one of the main factors that determine whether the liquid propellant can be obtained stably in the storage tank under microgravity. The multilayer stainless porous array structure whose microcolumn distance ranges from 50μm to 110μm was prepared through 3D printing. The internal structure and surface morphology of the porous array structure are observed with the X-ray microscope and scanning electron microscope.The capillary rising process in the porous array structure is investigated with the infrared camera by using HFE7500， ethanol， and ethylene glycol as the working fluids. The capillary performance parameters are obtained through the capillary rising curves. The results show that the porosity of the porous array structure increases as the microcolumn distance increases. Besides， a larger microcolumn distance leads to a faster rising velocity and a larger rising height. The maximum rising height of a porous array structure with a microcolumn distance of 110μm is 2.34 times that of a porous array structure with a microcolumn distance of 50μm. For the same porous array structure， the rising velocity with the ethanol is the highest， followed by HFE7500 and ethylene glycol， respectively. Moreover， the capillary performance factor increases as the microcolumn distance increases， indicating that the porous array structure with a microcolumn distance of 110μm has the best comprehensive capillary performance. The results provide a reference for the design of porous structure liquid acquisition device.

Key words: liquid management, porous array structure, porosity, microcolumn distance, capillary rise