| 基于CFD的高能射流式液动冲击器活塞与缸体密封特性研究 |
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| 引用本文： | 张鑫鑫,彭枧明,孙铭泽,吴冬宇.基于CFD的高能射流式液动冲击器活塞与缸体密封特性研究[J].吉林大学学报(地球科学版),2017,47(2). |
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| 作者姓名： | 张鑫鑫 彭枧明 孙铭泽 吴冬宇 |
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| 作者单位： | 吉林大学建设工程学院/国土资源部复杂条件钻进技术开放研究实验室,长春,130026 |
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| 基金项目： | 国土资源公益性行业科研专项(201311112)Supported by Public Science and Technology Research Funds Projects of Ministry of Land and Resources of China |
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| 摘 要： | 通过计算流体动力学分析与实验室测试,对SC-86H型高能射流式液动冲击器活塞与缸体密封特性进行研究,分析了活塞密封段长度、环状间隙尺寸、活塞往复运动速度、角速度以及活塞外表面螺旋槽螺距与半径等参数对射流式冲击器前后腔之间泄漏量的影响。结果表明:活塞密封段长度、环状间隙尺寸、角速度以及活塞表面螺旋槽螺距均对射流式液动冲击器性能影响较小;活塞运动速度与泄漏量近似成正比例关系;随着活塞螺旋槽半径的增大,泄漏量会明显增大。活塞回程与冲程初期阶段,活塞运动速度较小,活塞处瞬时泄漏量占进入缸体前后腔流体流量的比例较大,使活塞无法快速加速运动,尤其是当活塞杆直径较大时,回程阶段泄漏量对活塞运动的影响更显著,导致冲击器工作性能大幅下降,甚至无法工作。
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| 关 键 词： | 计算流体动力学 高能射流式液动冲击器 活塞 缸体 泄漏量 |
Study on the Sealing Characteristics Between the Piston and Cylinder in the High-Energy Liquid-Jet Hammer Based on CFD Method |
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| Zhang Xinxin,Peng Jianming,Sun Mingze,Wu Dongyu.Study on the Sealing Characteristics Between the Piston and Cylinder in the High-Energy Liquid-Jet Hammer Based on CFD Method[J].Journal of Jilin Unviersity:Earth Science Edition,2017,47(2). |
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| Authors: | Zhang Xinxin Peng Jianming Sun Mingze Wu Dongyu |
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| Abstract: | The sealing characteristics of the piston and cylinder in the SC-86 H high-energy liquidjet hammer were studied based on computational fluid dynamics (CFD) analysis and laboratory tests.The effect on the leakage between the front chamber and rear chamber of the liquid-jet hammer were analyzed from the aspects of sealing length,annular gap,reciprocating motion velocity,angular velocity of the piston and the pitch and radius of the spiral groove on the outside surface of the piston.Results showed that little influence on the performance of the liquid-jet hammer was caused by the varying of sealing length,annular gap,angular velocity of the piston and the pitch of the spiral groove on the outside surface of the piston;The leakage between the front chamber and rear chamber is nearly proportional to the reciprocating motion velocity of the piston;While the radius of the spiral groove increased,the leakage increased remarkably;At the beginning of the forward and backward strokes,as the reciprocating velocity of the piston was quite slow,the leakage occupied a large proportion of the total liquid flow into the front chamber and rear chamber,instantaneously,the accelerated motion of the piston was influenced,especially when the diameter of the piston rod was larger to some extent,the piston would not be able to move backward easily,the performance of the liquid-jet hammer will got worse and even was unable to work. |
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| Keywords: | computational fluid dynamics (CFD) high-energy liquid-jet hammer piston cylinder leakage |
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