Tomo/SPIV在水力学内流实验中的物像定标技术研究

In order to measure the three dimensional motion of fluids, Tomo/SPIV velocity measurement techniques based on multiple cameras are used more and more widely. When Tomo/SPIV is used in complicated hydrodynamic internal flow experiments, continuous distortions exist in each camera due to the refractive index differences across the air-water interface. The distortions would break the objective-image calibration relation, which is the basis of stereo imaging calculation. Consequently, it would jeopardize the three dimensional velocity reconstruction in SPIV and especially the performances of many important procedures in Tomo-PIV. (e.g. the distortion in objective-image registration would increase the probability of ghost particles significantly and cut down the particle density.) Due to the complexity of the experimental facility, model and flow, the existing schemes of the objective image calibration in Tomo/SPIV, domestic or overseas, are still not qualified enough for the hydrodynamic internal flow. Moreover, the accuracy of the existing Tomo/SPIV systems is also insufficient, the improvement of the experiment scheme and algorithm are needed badly. Thus, this project for the research about the objective image calibration scheme and algorithm of Tomo/SPIV, aims for the model experiments in complicated, closed and narrow hydrodynamic internal flow, in order to enable it to reconstruct the accurate objective-image relation, promote high-accuracy Tomo/SPIV measurements, and finally develop a generalized and convenient Tomo/SPIV experiment scheme for complicated hydrodynamic internal flow.

因流体运动的三维性，基于多相机测速的Tomo/SPIV技术应用日渐广泛。Tomo/SPIV用于水力学复杂内流实验时，因界面内外的折射率差，相机在各自像面上存在连续畸变，破坏了立体成像计算所依赖的物－像定标关系，对SPIV三维速度重构、特别是Tomo-PIV的多项关键性能造成严重影响－物像套准畸变会显著增加鬼影粒子出现概率、降低重构粒子密度。因实验装置、实验模型和流动的的复杂性，国内外已有的Tomo/SPIV技术中的物像定标方案对水力学复杂内流实验迄今仍不完善，且精度无法保证，实验方案和算法讫待改进。 本申请拟研究Tomo/SPIV在复杂、封闭、狭窄的水力学内流模型试验中的物像定标技术方案和算法，使其能够高精度重建真实测试状态下的物－像套准关系、开展Tomo/PIV高精度测量，形成通用化、便捷化的水力学复杂内流Tomo/SPIV实验技术方案。

因流体运动的三维性，基于多相机测速的Tomo/SPIV技术应用日渐广泛。Tomo/SPIV用于水力学复杂内流实验时，因界面内外的折射率差，相机在各自像面上存在连续畸变，破坏了立体成像计算所依赖的物－像标定关系，对SPIV三维速度重构、特别是Tomo-PIV的多项关键性能造成严重影响－物像套准畸变会显著增加鬼影粒子出现概率、降低重构粒子密度。因实验装置、实验模型和流动的的复杂性，国内外已有的Tomo/SPIV技术中的物像定标方案对水力学复杂内流实验迄今仍不完善，且精度无法保证，实验方案和算法讫待改进。本申请拟研究Tomo/SPIV在复杂、封闭、狭窄的水力学内流模型试验中的物像定标技术方案和算法，使其能够高精度重建真实测试状态下的物－像套准关系、开展Tomo/PIV高精度测量，形成通用化、便捷化的水力学复杂内流Tomo/SPIV实验技术方案。