航空燃油喷嘴组件流道尺寸的控制对于航空器的可靠性和安全性具有至关重要的意义，传统方法是通过间接的流量试验来进行筛选，该方法不仅成本高而且效率低。提出了一种基于CT检测体数据的喷嘴组件流道偏移量的测量方法，其首先采用RSF （区域可扩展拟合）模型分割喷嘴CT体数据的流道区域，然后提取流道内外轮廓面，接着采用最小二乘拟合方法计算流道内壁和外壁的圆方程，根据内外圆心距离得到流道的偏移量。采用该方法对标准喷嘴试样的CT图像进行测量，结果表明其能够精确提取流道轮廓表面数据，测量的线性误差为0.010 4 mm，具有一定的工程应用价值。

The control of the flow channel size of the jet fuel nozzle assembly is of great significance to the reliability and safety of the aircraft. The traditional method is to screen through indirect flow test, which is not only cost-effective but also inefficient. This paper presents a measurement method of flow channel offset of nozzle assembly based on CT volume data. Firstly, RSF (Region-Scalable Fitting) model was used to segment the flow channel area of nozzle CT volume data, and then the inner and outer contour surfaces of the flow channel wereextracted. Then, the circular equations of the inner and outer walls of the flow channel werecalculated by the least square fitting method, and the flow channel offset wasobtained according to the inner and outer center distances. The CT image of the standard nozzle sample wasmeasured. The results showed that the method can accurately extract the contour surface of the flow channel, and the uncertainty of measurement was 0. 010 4 mm. It hada certain engineering application value.