Exploitation of Hypervelocity liquid jet generator by using Neumann effect

利用诺伊曼效应超高速液体射流发生器的开发

• 批准号: 08555045
• 负责人: TAKAYAMA Kazuyoshi
• 金额: $ 6.21万
• 依托单位: Tohoku University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (A)
• 财政年份: 1996
• 资助国家: 日本
• 起止时间: 1996 至 1997
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-08555045/
• 关键词: High Speed Jet; Neumann effect; Shock Wave; Numerical Simulation; Powder gun; Two-stage light gas gun; Hypervelocity Impact

High speed liquid jets have been intensively applied to the process of fuel sprays in diesel engines and also water jet cutting technology. However, their peak speed ranges up to 1 km/s. Today neither the method of generating high speed liquid jets nor its underatanding have not yet been technically well developed. Previously the chief investigator of this project has developed atechnology in which by using a single stage gas gun the impact of a flat headed high speed projectile of 1-2 km/s on a liquid container created high speed jets of 3-4 km/s. However, this method required a very elaborately designed non-reusable type nozzle so that it can never be practical. It is well known that in pyro-engineering a reverse cone shaped charge, once detonated, produced a very high speed debris jet along its axis, whose principle is called the von Neumann effect. High speed liquid jets can be readily produced by following the von Neumann effect when a reverse cone shaped water container was impin … More ged by a high speed flat headed piston. This project aims to simulate numerically the generation high speed liquid jets and based upon the numerical result to construct a compact facility which can generate high speed liquid jets as an extension of the von Neumann effect. Results obtained are summarized as following :(1) Numerical simulation revealed that the gain in jet speeds was over 50 % of piston speeds.(2) The apex angle of reverse cone shapes was approximately 22 degree and the resulting jet speed ranged from 3 to 6 km/s.(3) A single stage gas sun of 15 mm bore was manufactured which drove projectiles with muzzle speed of 0.6 to 1.5km/s for the amount of smokeless powder of 0.5 to 1.5 gr.(4) Holographic interferometric observations have been successfully carried out to visualize the formation and fragmentation of liquid jets.(5) The flight and fragmentation of liquid droplets have been clarified and their results revealed that it is technically possible to obtain a high speed water jet exceeding over 6 km/s. Less

高速液体喷气机在柴油发动机中施加了Procel Sprays和水的峰值速度，最多可达1 km/s。 LE级气枪对液体产生的高速弹丸的撞击产生了3-4 km/s的高速喷射永远，永远不要永远不会是beby kno wn，在pyro工程中，反向锥形电荷（一旦引爆，就会沿轴产生非常高的碎屑喷气机，高速液体喷气机可以很容易地由von Neumann Folly生产当反向锥形的水容器被击倒时，效果是通过高速平面活塞进行的。 von neumann效应的ASION。 15毫米孔的制造驱动了弹丸的刺激性速度为0.6至1.5 gr飞行和碎片在技术上可以获得超过6 km/s的高速射流

项目成果

T.Meguro, K.Takayama, O.Onodera: "Three-dimensional Shock Wave Reflection over a Coner of Two Intersecting Wedges" Shock Waves. Vol.7. 107-121 (1997)

T.Meguro、K.Takayama、O.Onodera：“两个相交楔形角上的三维冲击波反射”冲击波。

N.Hirano, K.Takayama, J.Falcovitz: "Study of High Speed Liquid Jet Impingement on Solid Walls" Proc.of the 9th meeting of Inst.Fluid Sci., Tohoku Univ. 167-170 (1997)

N.Hirano、K.Takayama、J.Falcovitz：“固体壁上高速液体射流冲击的研究”东北大学流体科学研究所第 9 次会议论文集。

Z.Jiang, K.Takayama: "Study of Instability of Supersonic Free Jets Their Impinging on Solid Walls" Proc.of JSME Centennial Grand Congress. Vol.2. 949-954 (1997)

Z.Jiang，K.Takayama：“超音速自由射流撞击固体壁的不稳定性研究”JSME百年大会论文集。

K.Koremoto, W.Isbell, K.Takayama: "In-Bore Measurement of a Piston Speed Using a Piston Motion Velocity Interferometer(PMVI)" Proc.of JSME Centeenial Grand Gongress. Vol.2. 359-362 (1997)

K.Koremoto、W.Isbell、K.Takayama：“使用活塞运动速度干涉仪 (PMVI) 进行活塞速度的内孔测量”Proc.of JSME 百年大女学者。

N.Hirano, J.Fapclvitz, N.Nagayasu, K.Takayama: "Study of Characteristics of High Speed Liquid Jets" Proc.of Shock Wave Symp.1997. 529-531 (1997)

N.Hirano、J.Fapclvitz、N.Nagayasu、K.Takayama：“高速液体射流特性研究”Proc.of Shock Wave Symp.1997。