A combustion chamber simulator with complex channels was manufactured by selective laser melting tech-nique.Convex cubic residues with different sizes were prefabricated in the channels,and a set of standard size metal wires were placed to simulate linear residues.Computed radiology(CR)and microscopic computed tomography(CT)were utilized to investigate the detection capability of X-ray imaging method for residues in the internal channels of addi-tive parts,and the wall thickness of channel was analyzed and evaluated by micro-CT.The results indicate that CR can detect the convex cubic residues with a minimum size of 0.15 mm and linear residues with a minimum diameter of 0.1 mm,while micro-CT can detect the convex cubic residues with a minimum size of 0.08 mm and linear residues with a minimum diameter of 0.1 mm.The measurement sizes of linear residues are consistent with standard size,while that of convex cubic residues are generally larger than the designed sizes with the maximum absolute error less than 50 μm.Moreover,the wide-section channels exhibit desirable uniformity by micro-CT.
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