基于高分辨率数据重构的固体燃料冲压发动机燃料平均燃速测试

采用一种非接触主动式扫描和结构光栅投影定位技术,对以高密度聚乙烯(HDPE)为推进剂的固体燃料冲压发动机地面实验后药柱内孔燃烧形貌进行了三维点云数据重构,获得了固体燃料内表面当地平均燃速的三维分布云图。研究发现:①通过该方法计算所得药柱燃烧去除质量与实验后实际质量变化量误差在0.1%内,精度满足用于固体燃料燃速的评估要求;②构建的数据重构燃速测试方法能真实反映燃料药柱结构变化,且具有一定的适用性;③通过该方法得到了当地平均燃速与总平均燃速的关系并通过线性拟合的方法得到了燃速与来流空气质量通量关系。通过对该方法的验证分析,认为所提出的燃速测试方法对深入研究固体燃料冲压发动机燃速具有一定的参考价值。 

Measurement and analysis of fuel average regression rate of solid fuel ramjet based on high-resolution data reconstruction

A non-contact active scanning and structural grating projection positioning technique was used to reconstruct the three-dimensional point cloud data of combustion morphology of solid fuel ramjet grain after ground test using high density polyethylene (HDPE) as propellant. The three-dimensional distribution cloud map of mean local regression rate on the inner surface of solid fuel was obtained. The results showed that: (1) the error between the burning removal quality of the grain calculated by this method and the actual mass change after experiment was within 0.1%. The accuracy met the requirement of regression rate evaluation for solid fuel. (2) The reconstructed regression rate test method can truly reflect the change of fuel grain structure with certain applicability. (3) The relationship between mean local regression rate and total average regression rate was obtained by this method, and the relationship between regression rate and inflow air mass flux was obtained by linear fitting method. Through the validation and analysis of this method, it is concluded that the regression rate test method has a certain reference value for the further study of solid fuel ramjet gressionrate.