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

发布时间：2018-03-12 19:37

本文选题：计算流体动力学　切入点：高能射流式液动冲击器　出处：《吉林大学学报(地球科学版)》2017年02期 　论文类型：期刊论文

【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。
[Abstract]:Through the analysis and calculation of Fluid Dynamics Laboratory test, the SC-86H type high energy liquid jet actuator piston and cylinder of impact sealing property, analysis of the piston seal length, annular gap size, the reciprocating movement of the piston velocity, angular speed and the piston outer surface of spiral groove pitch and radius of between before and after the jet impactor cavity leakage. The results show that the piston seal length, annular size, angular velocity and spiral groove surface of the piston pitch are less affected on the dynamic property of the impactor liquid jet; velocity of piston and the leakage approximation is proportional; with the increase of the radius of the spiral groove of piston, leakage early will be significantly increased. The stage and the return piston stroke, the piston velocity is smaller, the piston instantaneous leakage of fluid flow into the cavity accounted for the proportion of the piston cylinder before and after large, unable to quickly add When the diameter of piston rod is large, the effect of leakage on piston motion is more obvious, which leads to a sharp decrease in the performance of the impactor and even no work.

【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;
【基金】：国土资源公益性行业科研专项(201311112)~~
【分类号】：TE927

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