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综述了弹道靶道测量技术所采用的各种正文光路,着重介绍我国自行研制的第一条中间弹道靶道所采用的菲涅尔透镜间接阴影系统的正交光路设计,以及采用该光路建成的IB-12中间弹道靶道,在首次试验中获得的高速脱壳穿甲弹炮口区飞行姿态和脱壳全过程的照片.同时对该光路设计中存在的问题也做了分析。 相似文献
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Experiments were conducted to study the atomization phenomena of kerosene jet in supersonic flow. The kerosene jet was driven
by compressed nitrogen. Meanwhile, the shadowgraph and planar laser-induced fluorescence (PLIF) were used to visualize the
flow field in the case of different total pressure and jet pressure. The results imply the followings: The combination of
shadowgraph and PLIF is a reasonable method to study the atomization phenomena in supersonic flow. PLIF can detect the distribution
of kerosene droplets accurately. Shadowgraph can visualize the wave structure. Higher jet-to-freestream dynamic pressure initiates
higher penetration height and the jet column will be easier to breakup and atomize, but it also induces stronger shock waves
and aggravate total pressure lost. Three-dimensional, unsteady surface wave plays an important role in making the jet break
up and atomize. Higher jet-to-freestream dynamic pressure will accelerate the development of surface wave and enlarge the
amplitude of surface wave, while lower jet-to-freestream ratio will inhibit the development of surface wave.
Supported by the Fund for the Application of the Combination of Plif and Schlieren Methods in the Study of Mixing Enhancement
by Newtype Cavity in Supersonic Combastion Field (Grant No. 10402040) 相似文献
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中国民间皮影艺术人物造型分析 总被引:2,自引:0,他引:2
通过对各个地域的皮影人物造型进行了分析研究,得出皮影人物造型具有平面化,戏曲化以及地域化的艺术特征。运用比较的手法,从材料、质地、使用场景等角度将民间皮影人物造型与中国传统剪纸艺术中的人物造型进行对比分析,得出两者的相似以及不同点,阐述了皮影艺术具有粗、俗、野的民俗特点。 相似文献
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介绍了一种以氮分子激光器作光源的CCD相机阴影照相系统,该系统能可靠地对高速运动目标和瞬变现象进行阴影照相电子成像,并提出了基于该系统的阴影照相电子成像测速法.该系统具有一些独到的优点:作为系统光源的氮分子激光器的脉宽为纳秒量级(火花光源的脉宽为微秒或亚微秒量级),适用于高速摄影;对环境无特殊要求,能在一般室内环境下正常工作;电子成像技术的采用,使得该系统无需显、定影及判读等操作,直接由计算机进行图像处理和输出. 相似文献
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开展弹头在膛口流场运动特性的研究,在准确理解膛口气流对弹头作用以及提高武器射击精度方面都具有重要意义。以某发5.8 mm口径步枪弹为例,提出了结合高速摄影与阴影照相法,对弹头在膛口流场运动特性进行了试验研究。以试验测试膛压数据为依据,运用耦合内弹道的计算流体力学方法研究弹头在膛口流场中的受力和运动规律。试验结果表明,采用所设计的试验方案可以捕捉到后效期清晰的流场变化和弹头运动。数值计算研究发现:弹头在膛口流场中的运动并非全程加速,冠状气团和火药核心射流的作用是弹头速度变化的主要原因;在轴向力转变时刻,弹头底部仍存在弹底激波。 相似文献
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Tests of hypervelocity projectile impacts to a double-wall structure made of LY12 aluminum were performed using a two-stage light gas gun. In the bumper plate hole analysis, empirical equations that relate hole dimensions to impact parameters such as velocity, angle of obliquity and bumper plate thickness are obtained. The laser shadowgraphs in order to get the expansion of debris clouds were taken and the characteristic parameters obtained. The damage effects of the back wall varying with impact parameters were studied. The expansion of debris clouds was determined. 相似文献