In order to explore the effectiveness of the fractal interpolation algorithm applied to the five-hole probe flow field test

two kinds of five-hole probe calibration for gas turbine flow field test are completed through the standard wind tunnel test

and the angle calibration coefficients

total pressure and static pressure calibration coefficients are obtained. The fractal interpolation algorithm is proposed to order the calibration data

and the results are compared with those of the polynomial fitting interpolation. Most of the original angle-calibration coefficient curves of two probes are convex quadrilateral

and there is obvious symmetry with respect to 0° yaw angle and 0° pitch angle

which proves that the probe design and machining quality are satisfactory. The interpolated values of angle calibration coefficient

total pressure and static pressure coefficient of the established 3D interpolation model are almost identical with those of the original sample

which verifies the validity of the 3D interpolation model. The interpolated values of the 2D polynomial fitting interpolation method at individual edge points and internal nonlinear feature points show large deviations from the original measurements

and there is almost no difference at most points

indicating that the polynomial fitting interpolation method is only valid within the calibrated angle range and is unsuitable for extrapolation beyond it.. Compared with the 2D polynomial fitting interpolation method

the interpolated value of fractal interpolation method is closer to the original data

which can avoid the Runge phenomenon inherent in polynomial fitting interpolation at boundary and internal nonlinear characteristic points

and verify the effectiveness of the fractal interpolation method applied to five-hole probe calibration.