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喷水织机上喷水参数对水射流速度的影响 被引量:1
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作者 李克让 麻巍伟 陈明 《丝绸》 CAS 北大核心 2002年第9期9-11,共3页
采用激光多普勒法及正交试验法 ,测试了不同条件下喷水织机的喷射水流速度在梭口轴线上的分布 ,指出喷嘴是影响速度分布的主要因素 ,同时也决定喷射水流的发散程度 ,喷水压力和水流量则分别影响喷射水流的速度峰值大小及峰值点离开喷嘴... 采用激光多普勒法及正交试验法 ,测试了不同条件下喷水织机的喷射水流速度在梭口轴线上的分布 ,指出喷嘴是影响速度分布的主要因素 ,同时也决定喷射水流的发散程度 ,喷水压力和水流量则分别影响喷射水流的速度峰值大小及峰值点离开喷嘴口的距离 。 展开更多
关键词 喷水织机 水射流速度 喷水速度 测试 喷嘴
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水刀水射流速度计算方法 被引量:3
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作者 温赞江 《机械工程师》 2011年第3期50-51,共2页
应用伯努利方程,分析了水刀高压管内水流体的能量变化,简化了水射流速度的计算方法,使实际应用中能了解到水射流速度与增压缸输出压力变化的相互关系。
关键词 水刀 水射流速度 伯努利方程
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水射流引导激光制造Inconel 718合金沟槽结构的研究
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作者 赵闯 赵玉刚 +6 位作者 赵丹丹 孟硕 于翰林 李智豪 曹辰 张海云 孟建兵 《中国机械工程》 EI CAS CSCD 北大核心 2023年第20期2403-2410,共8页
为了探究水射流引导激光(WJGL)技术在Inconel 718合金上制造沟槽结构的规律特征,在自行研发的水导激光设备上设计并进行了多组单因素实验,分析了水射流速度和激光能量密度对沟槽结构的深度、宽度以及毛刺尺寸的影响规律。实验结果表明,... 为了探究水射流引导激光(WJGL)技术在Inconel 718合金上制造沟槽结构的规律特征,在自行研发的水导激光设备上设计并进行了多组单因素实验,分析了水射流速度和激光能量密度对沟槽结构的深度、宽度以及毛刺尺寸的影响规律。实验结果表明,激光能量密度对沟槽结构尺寸的影响程度要高于水射流速度,在喷嘴孔径固定不变的条件下,激光能量密度和水射流速度对沟槽结构宽度的影响很小。采用孔径为0.5 mm的喷嘴,当水射流速度固定为60 m/s,激光功率密度为40 J/cm~2时,获得最大沟槽平均深度为523μm;当激光能量密度为10 J/cm~2时,获得最窄沟槽平均宽度为403μm;当激光能量密度为40 J/cm~2时,获得最小毛刺平均尺寸为54μm。根据理论分析得出,水导激光技术去除Inconel 718合金的机制是通过激光烧蚀并熔化材料,水射流将熔融物冲刷去除。 展开更多
关键词 水射流引导激光 Inconel 718合金 沟槽结构 激光能量密度 水射流速度
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高压水射流消除残余应力的喷嘴流场分析 被引量:3
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作者 郑红祥 蒋文春 +5 位作者 张玉福 苏厚德 陈韶范 任林昌 李圣军 边增鑫 《化工机械》 CAS 2019年第5期541-545,共5页
介绍了射流机理,给出了控制方程。建立了喷嘴流场计算模型,研究了5种喷嘴结构对速度分布和靶件冲击压力的影响规律。结果表明:圆锥直线型喷嘴的水射流冲击压力和轴心速度虽然略小于圆锥型(13°)喷嘴,但其水射流的集束性和稳定性均... 介绍了射流机理,给出了控制方程。建立了喷嘴流场计算模型,研究了5种喷嘴结构对速度分布和靶件冲击压力的影响规律。结果表明:圆锥直线型喷嘴的水射流冲击压力和轴心速度虽然略小于圆锥型(13°)喷嘴,但其水射流的集束性和稳定性均优于其他4种类型的喷嘴,因此圆锥直线型喷嘴最适宜作为高压水射流消除焊接残余应力的配套喷嘴。 展开更多
关键词 喷嘴 高压水射流 水射流速度 冲击压力 消除残余应力
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高压水射流对白云鄂博矿单体解离度的影响 被引量:1
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作者 高一博 白春华 +2 位作者 王建英 吴旭 雷霄 《过程工程学报》 CAS CSCD 北大核心 2021年第3期298-304,共7页
矿物的单体解离是其能被高效选别的关键因素之一,粉碎方法对矿物单体解离度有很大的影响。白云鄂博稀土矿含十几种稀土矿物,矿物共生密切,嵌布类型复杂,其中稀土主要富集在氟碳铈矿与独居石矿中。分析表明矿物因相互包裹穿插和交代而形... 矿物的单体解离是其能被高效选别的关键因素之一,粉碎方法对矿物单体解离度有很大的影响。白云鄂博稀土矿含十几种稀土矿物,矿物共生密切,嵌布类型复杂,其中稀土主要富集在氟碳铈矿与独居石矿中。分析表明矿物因相互包裹穿插和交代而形成毗连、网脉、溶蚀和环状嵌布。为提高矿物的单体解离度,通过自主研发水射流矿物解离装置,探究了水射流速度对白云鄂博矿稀土单体解离度的影响。在同等粒度分布下,对高压水射流粉碎与常规球磨(铁介质)实验结果进行了对比,分析了两种粉碎方式对稀土矿物解离状态及颗粒界面的影响。激光共聚焦显微镜、矿物特征自动定量分析系统(AMICS)分析表明,高压水射流粉碎白云鄂博稀土矿物单体解离度优于球磨,具有解离度高、粒度相对均匀等特点;矿物颗粒天然界面保持较好、表面较光洁,稀土矿物集中在0.038 mm以下颗粒中,有益于稀土的浮选分离,对白云鄂博矿的矿石粉碎具有一定的指导意义。 展开更多
关键词 白云鄂博矿 矿物解离度 水射流粉碎 水射流速度 颗粒界面
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如何减少水刀切割产品的毛刺问题 被引量:2
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作者 潘清云 晏辉 《石材》 2013年第7期14-18,共5页
水刀切割技术是石材加工中的一种新型的加工技术,可以加工任意曲线,任何几何形状的产品。但是由于受水刀机压力、水射流速度、切割速度、切割磨料等因素的影响,加工出来的产品存在不同程度的毛刺,本文对毛刺产生的原因进行了分析,提出... 水刀切割技术是石材加工中的一种新型的加工技术,可以加工任意曲线,任何几何形状的产品。但是由于受水刀机压力、水射流速度、切割速度、切割磨料等因素的影响,加工出来的产品存在不同程度的毛刺,本文对毛刺产生的原因进行了分析,提出了处理的工艺方法。 展开更多
关键词 高压水射流 水射流速度 水射流 毛刺 工作压力 切割速度 水刀机
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Impingement capability of high-pressure submerged water jet: Numerical prediction and experimental verification 被引量:3
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作者 刘海霞 邵启明 +1 位作者 康灿 龚辰 《Journal of Central South University》 SCIE EI CAS CSCD 2015年第10期3712-3721,共10页
At jet pressures ranging from 80 to 120 MPa, submerged water jets are investigated by numerical simulation and experiment. Numerical simulation enables a systematic analysis of major flow parameters such as jet veloci... At jet pressures ranging from 80 to 120 MPa, submerged water jets are investigated by numerical simulation and experiment. Numerical simulation enables a systematic analysis of major flow parameters such as jet velocity, turbulent kinetic energy as well as void fraction of cavitation. Experiments facilitate an objective assessment of surface morphology, micro hardness and surface roughness of the impinged samples. A comparison is implemented between submerged and non-submerged water jets. The results show that submerged water jet is characterized by low velocity magnitudes relative to non-submerged water jet at the same jet pressure. Shear effect serves as a key factor underlying the inception of cavitation in submerged water jet stream. Predicted annular shape of cavity zone is substantiated by local height distributions associated with experimentally obtained footprints. As jet pressure increases, joint contribution of jet kinetic energy and cavitation is demonstrated. While for non-submerged water jet, impingement force stems exclusively from flow velocity. 展开更多
关键词 submerged water jet CAVITATION shear effect impingement test micro hardness surface morphology
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In situ experimental study on TBM excavation with high-pressure water-jet-assisted rock breaking 被引量:9
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作者 ZHANG Jin-liang YANG Feng-wei +2 位作者 CAO Zhi-guo XIA Yi-min LI Yong-chang 《Journal of Central South University》 SCIE EI CAS CSCD 2022年第12期4066-4077,共12页
China’s first high-pressure hydraulically coupled rock-breaking tunnel boring machine(TBM) was designed to overcome the rock breaking problems of TBM in super-hard rock geology, where high-pressure water jet system i... China’s first high-pressure hydraulically coupled rock-breaking tunnel boring machine(TBM) was designed to overcome the rock breaking problems of TBM in super-hard rock geology, where high-pressure water jet system is configured, including high-flow pump sets, high-pressure rotary joint and high-pressure water jet injection device. In order to investigate the rock breaking performance of high-pressure water-jet-assisted TBM, in situ excavation tests were carried out at the Wan’anxi Water Diversion Project in Longyan, Fujian Province, China, under different water jet pressure and rotational speed. The rock-breaking performance of TBM was analyzed including penetration, cutterhead load, advance rate and field penetration index. The test results show that the adoption of high-pressure water-jet-assisted rock breaking technology can improve the boreability of rock mass, where the TBM penetration increases by 64% under the water jet pressure of 270 MPa. In addition, with the increase of the water jet pressure, the TBM penetration increases and the field penetration index decreases. The auxiliary rock-breaking effect of high-pressure water jet decreases with the increase of cutterhead rotational speed. In the case of the in situ tunneling test parameters of this study, the advance rate is the maximum when the pressure of the high-pressure water jet is 270 MPa and the cutterhead rotational speed is 6 r/min. The technical superiority of high-pressure water-jet-assisted rock breaking technology is highlighted and it provides guidance for the excavation parameter selection of high-pressure hydraulically coupled rock-breaking TBM. 展开更多
关键词 tunnel boring machine high-pressure water jet PENETRATION advance rate field penetration index
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Pressure Variation in the Fluid inside a Tesla Turbine
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作者 D. Bastos-Netto, S. Cardoso H.S. Couto 《Journal of Energy and Power Engineering》 2011年第6期525-527,共3页
The recent technological developments being applied to Tesla like turbines for converting fluid energy into mechanical (axis) energy often lead to non-frequently used models. Given a disk shaped machine rotating aro... The recent technological developments being applied to Tesla like turbines for converting fluid energy into mechanical (axis) energy often lead to non-frequently used models. Given a disk shaped machine rotating around its own symmetry axis, part of the machine energy is transferred to the fluid itself, pushing it to the disk periphery. This way the farther the exhaust orifice is from the disk outside contour, the larger will be the pressure loss experienced by the system. This work studies the overall energy balance and momentum exchange between fluid and machine. Simple calculation shows that for total pressure gradients above two bar the machines become inefficient for having tangential velocity whose intensity is 50% higher than the intensity of the jet velocity prior to the interaction. For values of the pressure gradient above 5.7 bar, the machine peripheral velocity is equal to the incident jet velocity. In this case it is not possible to deliver power under permanent regime. Finally it is shown that when the feeding pressure of an impulse turbine is enough for more than one stage, then one should use this option to obtain thermal efficiencies similar to those of reaction machines. The jet of fluid to move a Tesla like turbine should enter the unit as close as possible to the direction tangential to the movement, (i.e., normal to the radius at the considered position). This fluid should leave the machine right after interacting with it. Any permanence of the fluid after transferring its momentum to the machine can be extremely prejudicial to the system behavior. 展开更多
关键词 Tesla turbines momentum balance energy balance.
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