Flow Characterization of a Detonation Gun Facility and First Coating Experiments

Flow Characterization of a Detonation Gun Facility and First Coating Experiments
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爆轰枪设施的流动特性和首次涂层实验

DOI:
10.1007/s11666-014-0083-4
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发表时间:
2014
影响因子:
3.1
通讯作者:
H. Olivier
H. Olivier
中科院分区:
材料科学2区
文献类型:
--
作者:
C. Henkes;H. Olivier

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设计了一种计算机控制的爆炸喷枪喷涂装置,并进行了试验,获得了超过1200 m/s的粒子速度。该装置能够基于不同的流动物理原理以两种模式操作。在一种模式中,该装置的功能类似于传统的爆炸枪,其中粉末在冲击波中被加速。在另一种模式中,带有喷嘴的设施的扩展使用引爆气体用于间歇操作的激波风洞过程,其中颗粒被注入具有高储层条件的准稳定高焓喷嘴流中并由其加速。介绍了无喷嘴操作的实验结果,其中该装置以5 Hz的频率在间歇过程中产生中等到高的颗粒速度。在实验中使用氢/氧混合物以及Cu和WC-Co(88/12)粉末。操作性能和管道流出的特点是时间分辨纹影图像和压力测量。用激光多普勒测速仪测量出流中的颗粒速度。不同的基体/粉末组合(Al/Cu,钢/Cu,Al/WC-Co,和钢/WC-Co)进行了研究,通过光学显微镜和显微硬度的测量。
A computer-controlled detonation gun based spraying device has been designed and tested to obtain particle velocities over 1200 m/s. The device is able to be operated in two modes based on different flow-physical principles. In one mode, the device functions like a conventional detonation gun in which the powder is accelerated in a blast wave. In the other mode, an extension of the facility with a nozzle uses the detonated gas for an intermittently operated shock tunnel process in which the particles are injected into and accelerated by a quasi-steady high enthalpy nozzle flow with high reservoir conditions. Presented are experimental results of the operation without nozzle in which the device generates moderate to high particle velocities in an intermittent process with a frequency of 5 Hz. A hydrogen/oxygen mixture and Cu and WC-Co (88/12) powders are used in the experiments. Operation performance and tube outflow are characterized by time-resolved Schlieren images and pressure measurements. The particle velocities in the outflow are obtained by laser Doppler anemometry. Different substrate/powder combinations (Al/Cu, Steel/Cu, Al/WC-Co, and Steel/WC-Co) have been investigated by light microscopy and measurements of microhardness.
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