Flow characteristics of high speed water jet and effective nozzle shape for machining

高速水射流的流动特性及有效加工喷嘴形状

• 批准号: 16560160
• 负责人: YAMAMOTO Katsuhiro
• 金额: $ 2.11万
• 依托单位: Waseda University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2004
• 资助国家: 日本
• 起止时间: 2004 至 2006
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-16560160/
• 关键词: Water Jet; Cavitation Jet; Mass Loss Curve; CIP Method; Impulse Water Jet; Impact Pressure; Flow Characeristics; Effective Nozzle Shape; ウォータージェット; 単発形超音速水噴流; キャビテーションモデル; HSMAC法; パルス形ウォータージェット

Two types of high speed water jets are examined by experimental method and numerical analysis to find effective nozzle shape. One is submerged water jet with constant delivery pressure of 50-200MPa, and nozzle diameter of 0.155 mm, the other is impulse water jet issuing from a taper nozzle into the atmosphere with velocity of 500m/s and nozzle diameter of 2mm.The main results are summarized as follows.(1) The finite difference method of CIP is effective for the numerical analysis of gas-liquid two phase flows which include discontinuous interface in the flow field.(2) In case of machining with high speed submerged water jet, the stand off distance of material from a nozzle should be taken as possible as short for piercing, drilling or cutting, because the momentum of jet plays an important role in removing material. On the other hand, the stand off distance depends on the delivery pressure for polishing or peening, because cavitation plays a main part the surface treatment. In both cases, outlet length of nozzle cap should be taken short and the diameter small.(3) On the impulse water jet which is produced by piston impact, collision and break up of the jet with complicated shock waves are observed by colored Schlielen method and high speed video camera. The computational results show the same characteristics of the jet flow as observed one qualitatively. The effect of the nozzle shape, the initial position of water column in the nozzle and stand off distance on the impact pressure on a solid material can be examined by CIP difference method.

通过实验和数值分析，研究了两种高速水射流的有效喷嘴形状。一种是淹没水射流，输出压力为50- 200 MPa，喷嘴直径为0.155 mm;另一种是脉冲水射流，从锥形喷嘴向大气喷射，速度为500 m/s，喷嘴直径为2 mm。主要结果总结如下。(1)CIP有限差分法是求解含间断界面气液两相流数值分析的有效方法。(2)在高速淹没水射流加工中，由于射流动量对材料的去除起着重要作用，因此在穿孔、钻孔或切割时，材料离喷嘴的距离应尽可能短。另一方面，间距取决于抛光或喷丸的输送压力，因为气穴在表面处理中发挥着主要作用。在这两种情况下，喷嘴帽的出口长度应取短，直径应取小。(3)本文用彩色Schlielen方法和高速摄像机对活塞冲击产生的脉冲水射流进行了观测，观察到了射流与复杂激波的碰撞和破碎。计算结果定性地显示了射流的特性。用CIP差分法研究了喷嘴形状、水柱初始位置和喷距对固体材料冲击压力的影响。

项目成果

Numerical Analysis of High-Speed puls Water Jets in the Atmosphere by CIP Method,

采用 CIP 方法对大气中高速脉冲水射流进行数值分析，

• 发表时间: 2005
• 期刊: Proc. of the Annual meetings for Water Jet Technology Water Jet Technology Society of Japan
• 作者: S.K.Stefanov;R.W.Barber;M.Ota;D.R.Emerson;ターボ機械協会編 分担執筆者(太田正廣);Taro NOGUTI et al.;Naoaki TAKAICHI et al.;山本 勝弘 他2名;Naoaki TAKAICHI et al.;Katsuhiro YAMAMOTO
• 通讯作者: Katsuhiro YAMAMOTO

Supersonic Impulse Jet of Water Issuing from Yaper Nozzle into Atmosphere,

超音速脉冲水射流从 Yaper 喷嘴喷入大气，

• 发表时间: 2007
• 期刊: Journal of the Visualization Society of Japan Vol.27 Suppl.No.1
• 作者: S.K.Stefanov;R.W.Barber;M.Ota;D.R.Emerson;ターボ機械協会編 分担執筆者(太田正廣);Taro NOGUTI et al.
• 通讯作者: Taro NOGUTI et al.

Behavior of High-Speed Pulse Water Jets in the Atmosphere,

大气中高速脉冲水射流的行为，

• 发表时间: 2005
• 期刊: Proc. of Int. Conf. on Jets, Wakes and Separated Flows, ICJWSF-2005 : JSME No.05-201
• 作者: S.K.Stefanov;R.W.Barber;M.Ota;D.R.Emerson;ターボ機械協会編 分担執筆者(太田正廣);Taro NOGUTI et al.;Naoaki TAKAICHI et al.;山本 勝弘 他2名;Naoaki TAKAICHI et al.
• 通讯作者: Naoaki TAKAICHI et al.

Behavior of High-Speed Pulse Water Jets in the Atmosphere

大气中高速脉冲水射流的行为

• 发表时间: 2005
• 期刊: Proc. of Int. Conf. on Jets, Wakes and Separated Flows,2005;JSME No.05-201
• 作者: S.K.Stefanov;R.W.Barber;M.Ota;D.R.Emerson;ターボ機械協会編 分担執筆者(太田正廣);Taro NOGUTI et al.;Naoaki TAKAICHI et al.
• 通讯作者: Naoaki TAKAICHI et al.

CIP法による大気中高速パルス水噴流の数値解析

CIP法对大气中高速脉冲水射流的数值分析

• 发表时间: 2005
• 期刊: 2005年度ウオータージェット技術年次報告会講演論文集(日本ウオータージェット学会)
• 作者: S.K.Stefanov;R.W.Barber;M.Ota;D.R.Emerson;ターボ機械協会編 分担執筆者(太田正廣);Taro NOGUTI et al.;Naoaki TAKAICHI et al.;山本 勝弘 他2名
• 通讯作者: 山本 勝弘 他2名