Particle Acceleration in a High Enthalpy Nozzle Flow with a Modified Detonation Gun
Particle Acceleration in a High Enthalpy Nozzle Flow with a Modified Detonation Gun
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使用改进的爆轰枪在高焓喷嘴流中进行粒子加速
DOI：
10.1007/s11666-014-0062-9
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发表时间：
2014
影响因子：
3.1
通讯作者：
H. Olivier
中科院分区：
文献类型：
--
作者：
C. Henkes;H. Olivier
热喷涂涂层的质量取决于许多因素，这些因素已经被研究并且仍然是科学焦点。大多数情况下，涂层材料作为固体粉末插入喷涂装置中。喷涂过程中的颗粒状态对涂层质量有很大影响。在某些情况下，更高的颗粒冲击能量导致涂层质量的改善。因此，一个计算机控制的爆轰枪为基础的喷涂装置已被设计和测试，以获得超过1200米/秒的粒子速度。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。在另一种模式下，带有喷嘴的延伸将爆震枪过程转变为间歇式激波风洞过程，其中颗粒在具有高储存器条件的高焓喷嘴流中加速。提出的是实验结果的操作与喷嘴中，该设备产生非常高的粒子速度高达5赫兹的频率。可变颗粒喷射系统允许在沿喷嘴轴线的任何点沿着喷射粉末，以控制颗粒温度和速度。在实验中使用氢/氧混合物。操作性能和喷嘴流出的特点是时间分辨压力测量。用准一维高阶WENO程序计算了喷管内和喷管出口平面内的颗粒状态。对于实验，颗粒速度是由粒子图像测速仪，和颗粒浓度定性确定的激光消光法。所用粉末为WC-Co（88/12）、NiCr（80/20）、Al 2 O3和Cu。不同的基体/粉末组合不同的粒子注入位置进行了研究，通过光学显微镜和显微硬度的测量。
The quality of thermal sprayed coatings depends on many factors which have been investigated and are still in scientific focus. Mostly, the coating material is inserted into the spray device as solid powder. The particle condition during the spray process has a strong effect on coating quality. In some cases, higher particle impact energy leads to improved coating quality. Therefore, 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 with a nozzle transforms the detonation gun process into an intermittent shock tunnel process in which the particles are accelerated in a high enthalpy nozzle flow with high reservoir conditions. Presented are experimental results of the operation with nozzle in which the device generates very high particle velocities up to a frequency of 5 Hz. A variable particle injection system allows injection of the powder at any point along the nozzle axis to control particle temperature and velocity. A hydrogen/oxygen mixture is used in the experiments. Operation performance and nozzle outflow are characterized by time resolved pressure measurements. The particle conditions inside the nozzle and in the nozzle exit plane are calculated with a quasi-one-dimensional WENO-code of high order. For the experiments, particle velocity is obtained by particle image velocimetry, and particle concentration is qualitatively determined by a laser extinction method. The powders used are WC-Co(88/12), NiCr(80/20), Al2O3, and Cu. Different substrate/powder combinations for varying particle injection positions have been investigated by light microscopy and measurements of microhardness.
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DOI：
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DOI：
--
发表时间：
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期刊：
影响因子：
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作者：
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影响因子：
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作者：
C. Henkes;H. Olivier
通讯作者：
H. Olivier