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为了解决单光程纹影系统在高马赫数、低静压流场显示中灵敏度低的问题,研制了国内首套最大口径为Φ900 mm的双光程纹影系统。与单光程纹影系统相比,双光程纹影系统具有更高的灵敏度,能提供更多的流场细节,能拓宽纹影技术的应用范围。通过用LED四色光源代替常规的彩色刀口、增加补偿透镜、优化照相物镜和精细调节LED四色光源,较好地消除了试验流场重影。通过增加入射光阑,有效减弱了试验流场中出现的光源光斑。对单光程纹影流场图与双光程纹影流场图进行了比较。在马赫数Ma=10、试验总压为2.0MPa、试验总温为1100K、攻角为0°~15°试验条件下,通过双光程纹影系统,获得了大钝头模型清晰的试验流场图像。最后分析了双光程纹影技术的优缺点及改进方向。
In order to solve the problem of low sensitivity in the single Mach-Zehnder system with high Mach number and low hydrostatic pressure, a dual-path lithography system with the largest diameter of Φ900 mm was developed. Compared with the single-light-stripe system, the dual-light-stripe system has higher sensitivity, provides more details of the flow field and broadens the range of applications of the striation technology. By replacing the conventional color blade with the four-color LED light source, adding the compensation lens, optimizing the photographic objective lens and finely adjusting the four-color LED light source, the ghost of the experimental flow field is well eliminated. By adding an incident stop, the light spot appearing in the test flow field is effectively reduced. The single-light-path flow pattern and the double-light-path flow pattern were compared. The clear experimental flow of large blunt nose model was obtained by using Mach-Zehnder number of Ma = 10, total test pressure of 2.0 MPa, total test temperature of 1100 K, and angle of attack of 0 ° -15 °. Field image. Finally, the advantages and disadvantages of the double optical path stripe technique and the improvement direction are analyzed.