论文标题
使用高分辨率背景的Schlieren技术，在微管中对水下冲击波的无接触式压力测量
Contactless pressure measurement of an underwater shock wave in a microtube using a high-resolution background-oriented schlieren technique
论文作者
论文摘要
提出了一种使用高分辨率摄像头和微型背景模式的高分辨率背景的Schlieren（BOS）技术，并用于测量微管中水下冲击波的压力场。冲击波的传播随后到达了微管中设置的凹水空气界面，从而导致聚焦的微射流弹出。这种高空间分辨率的BOS技术可以测量仅宽度仅为101μm的宽度的冲击锋的压力场，其峰值压力较大，峰值压力较大，距离近3 MPa，这比以前的研究分别更窄且大[1]。这一重大突破使冲击锋的压力冲动和微射线尖端的速度同时测量了。结果，我们在实验上观察了微夹尖端的速度与冲击阵线的压力冲动之间的线性关系，而液体散装中没有次级空化的情况。这种关系在理论上/数值上是由彼得斯预测的[2]。这项研究证明了拟议的高分辨率BOS技术作为水下冲击波以及潜在的其他微荧光液的微观无接触式压力测量工具的能力。
A high-resolution background-oriented schlieren (BOS) technique, which utilizes a high-resolution camera and a microdot background pattern, is proposed and used to measure the pressure field of an underwater shock wave in a microtube. The propagation of the shock wave subsequently reaches a concave water-air interface set in the microtube resulting in the ejection of a focused microjet. This high spatial-resolution BOS technique can measure the pressure field of a shock front with a width as narrow as the order of only 101 μm with a peak pressure as large as almost 3 MPa, which is significantly narrower and larger, respectively, than a previous study [1]. This significant breakthrough has enabled the simultaneous measurement of the pressure impulse of the shock front and the velocity of the microjet tip. As a result, we have experimentally observed the linear relation between the velocity of the microjet tip and the pressure impulse of the shock front for the cases without secondary cavitation in the liquid bulk. Such relation was theorectically/numerically predicted by Peters [2]. This study demonstrated the capability of the proposed high-resolution BOS technique as a microscale contactless pressure measurement tool for underwater shock waves and potentially other micro- and nano-fluids.
