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-  2016 

冲锤处流体阻力对高能射流式液动锤性能影响
Effects of Fluid Resistance on External Surface of Hammer of Liquid-Jet Hammer with High Blow Energy

DOI: 10.16450/j.cnki.issn.1004-6801.2016.05.028

Keywords: 计算流体动力学,射流式液动锤,冲锤,流体阻力,冲击频率
computaitional fluid dynamics(CFD)
, liquid-jet hammer, hammer, fluid resistance, blow frequency

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Abstract:

应用计算流体动力学(computational fluid dynamics,简称CFD)动态分析技术,对SC 86H型高能射流式液动锤试验样机流场特性进行了研究,计算得出了相关性能参数,并通过实验装置对液动锤不同输入流量下的冲击频率进行了测试。将液动锤冲击频率的模拟计算结果与实测结果进行了对比,结果表明:若不考虑冲锤处流体阻力的影响,液动锤冲击频率计算值与实测值相比明显偏大,最小相对误差达18.9%;而将冲锤处流体阻力的作用考虑在内,冲击频率的计算值与实测值比较接近,最大相对误差为8.0%,大幅提高了数值计算结果与实测值之间的吻合程度。这说明冲锤高速运动产生的轴向流体阻力不容忽略,设法减小冲锤处流体阻力的大小,有望成为提高高能射流式液动锤冲击功和能量利用率的重要途径。
The flow field characteristics and performance parameters of the prototype of a SC-86H liquid-jet hammer with high blow energy were calculated using CFD dynamic analysis. The blow frequency of the liquid-jet hammer was measured using specially designed testing equipment. In addition, the simulated results of the blow frequency of the liquid-jet hammer were compared with those measured results. If the fluid resistance on the external surface of the hammer was ignored, then the simulated results of the blow frequency were larger than the measured results, with a minimum relative error between them of 18.9%. If the fluid resistance at the hammer was taken into account, then the simulated results agreed with the measured results and showed a maximum relative error of 8.0%, which indicated great improvement of the simulation methods that has great agreement with experimental measurement. Therefore, taking measures to eliminate the axial fluid resistance caused by hammer movement will increase the liquid-jet hammer′s blow energy and energy efficiency.

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