共形转塔气动光学效应时空特性研究

研究了相同马赫数、相近雷诺数、不同口径(400 mm和2 000 mm)共形转塔的气动光学效应, 系统地给出了发射方向不同时气动光学效应导致的光束倾斜角和光束质量因子的时间变化特性、统计特性以及时间相关特性。发现多数场景下气动光学效应中平均流场效应占主要部分, 平均流场效应的特征频率由绕流流场的特征频率决定。尺寸效应的研究表明，缩比实验可以有效模拟实际飞行状态下气动光学效应的统计特性, 但无法准确模拟其时间相关特性。开展了前向发射时发射方向的优化选择, 指出发射方向在中轴线上天顶角约为40°时, 气动光学效应导致的波前畸变统计值和涨落值最小, 并且发射光束半径增加会导致平均流场效应快速增加, 但湍流效应基本不变。

Space-time characteristics of aero-optical effect around conformal turrets

This study simulated the aero-optical effect of beams with different projection directions around conformal turrets with different radii(400 mm and 2 000 mm). The Mach number was fixed, and the Reynolds number remained similar in all cases. The space-time characteristic of beam quality factor and beam tilt angle caused by the aero-optical effect was comprehensively studied. The aero-optical effect was mainly determined based on the mean flow effect, and the characteristic frequency of the mean flow effect was determined based on that of the flow around the turret. The spatial characteristic of the aero-optical effect was accurately reproduced in the reduced-scale experiments; however, the temporal characteristic was poorly simulated. It is pointed out that the wavefront distortion statistics and fluctuation values caused by aero-optical effect aero-optical effect appear to be minimized at a projection direction of 40° zenith in the forward direction, and the increase of projection radius can result in fast increaseing of the mean flow effect while maintaining the turbulent effect almost constant.