Drag Reduction of Blunt Body in a Supersonic Flow with Laser Energy Depositions
Drag Reduction of Blunt Body in a Supersonic Flow with Laser Energy Depositions
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DOI：
10.2514/6.2009-1533
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发表时间：
2009-01
期刊：
影响因子：
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通讯作者：
A. Sasoh;Y. Sekiya;T. Sakai;Jae Hyung Kim;A. Matsuda
中科院分区：
文献类型：
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作者：
A. Sasoh;Y. Sekiya;T. Sakai;Jae Hyung Kim;A. Matsuda
在马赫-2风洞中，测量了具有重复激光脉冲照射的平头圆柱的阻力。利用圆柱体头部的平凸透镜聚焦激光脉冲，重复频率高达10 kHz，最大有效功率为70W。阻力是用低摩擦活塞测量的，活塞由腔内的称重传感器在受控压力下支撑。测量非常精细，需要仔细实施才能准确确定减阻量。获得了约1.4N的减阻效果，相当于1400%以上的能量沉积效率。术语A=气缸体投影面积D=气缸直径F=力f=激光脉冲重复频率L=气缸盖与激光焦点的距离P=压力P0=大气压PSUB=分室压力t=时间W=时均激光功率α=拟合常数
Measurements of the drag over a flat-nosed cylinder with repetitive laser pulse irradiations ahead of it were conducted in a Mach-2, in-draft wind tunnel. Laser pulses were focused using a plane-convex lens fabricated on the nose of the cylinder at a repetition frequency of up to 10 kHz and an effective power of 70 W at a maximum. The drag was measured using a low-friction piston which was backed by a load cell in a cavity at a controlled pressure. The measurement was so delicate that careful implementation was necessary to accurately determine the amount of drag reduction. A drag reduction about 1.4 N which corresponds to an efficiency of energy deposition over 1400 % was obtained. Nomenclature A = projection area of cylinder body D = cylinder diameter F = force f = laser pulse repetition frequency L = distance between cylinder head and laser focus P = pressure P0 = atmospheric pressure Psub = pressure in sub-chamber t = time W = time-averaged laser power α = fitting constant