Imaging and Numerical Simulation of Unsteady Spray

非定常喷雾的成像与数值模拟

基本信息

批准号：
18560213
负责人：
FUJIMOTO Hajime
金额：
$ 2.42万
依托单位：
Doshisha University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2006
资助国家：
日本
起止时间：
2006 至 2007
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-18560213/
关键词：
Unsteady spray Refraction type telescope Numerical simulation DDM LES LIC Sauter mean diameter Hairpin type vortex 非蒸発噴霧 Large Eddy Simulation 渦構造

项目摘要

An unsteady spray is composed of ten millions of droplets. Their minute behavior affects the combustion process of the spray. Consequently, it is very useful for understanding the process to capture their spatial distribution. However, the spatial resolution of photographs taken by CCD camera is very low and it is difficult to recognize the individual droplet when the whole spray is taken on a photograph and only the local information is captured by the enlarged photography. The unsteady spray itself has the three dimensional structure, nevertheless, there is very little research to find this kind of structure. This project proposed the new technique of the super enlarged photography and calculated the two and three dimensional structures of an unsteady spray by the numerical simulation.The system of the super enlarged photography was composed of the lens system like a telescope of refraction type and a laser with low coherency and a large sized film (8[m] x 10[in]). It was able to cat … More ch the droplets information out of the region near the spray axis where the droplets density is too much through this optics and to obtain the two dimensional structure of the unsteady spray applying PIV technique to a photograph. Before about 35 years ago the head investigator found the droplets information in the range of about only 2[mm] from the spray envelope which was taken on a 35[mm] film by use of enlarging photography with a telescope.The numerical simulation was carried out by applying DDM for droplets and LES for the gaseous turbulence under the reference of KIVA code. It was capable of simulating the two dimensional structure of the spray by increase in the number of numerical mesh, by decrease in the numerical viscosity through the application of CIP technique and by optimization of breakup model And it is possible to calculate the two dimensional structure of vortex by LIC and the three dimensional structure of vortex by velocity gradient tensor.The main conclusions are as follows :1. It is able to capture the droplets information in the range from about 3[mm] from the spray axis to the spray envelope by use of new optics proposed.2. The Sauter mean diameter of droplets is ranged about from 10[μm] to 20[μm]. It decreases as the injection pressure increases.3. The droplets with small and medium size follow the movement of vortex with large scale generates at the spray tip region and those with large size appear at the outside of the vortex. The two dimensional arrangement of vortices is alternately and the three dimensional one is the multiplex of the vortices like hairpin. Less

不稳定的喷雾由100万滴。他们的微小行为会影响喷雾的组合过程。因此，这对于理解捕获其空间分布的过程非常有用。但是，CCD摄像机拍摄的照片的空间分辨率非常低，当在照片上拍摄整个喷雾时，很难识别单个液滴，并且仅由放大的摄影捕获了本地信息。不稳定的喷雾本身具有三维结构，但是，发现这种结构的研究很少。该项目提出了超级增强摄影的新技术，并通过数值模拟计算了不稳定喷雾剂的两维结构。它能够猫……通过这种光学元件，液滴密度过多的液滴信息更多，并获得了不稳定喷雾剂的二维结构，将PIV技术应用于照片。大约35年前，首席调查员在大约2 [mm]的范围内发现了液滴的信息，该信息是通过使用望远镜的放大摄影来拍摄的35毫米胶片，该液滴的信息是通过望远镜进行的。通过将DDM用于液滴和LES在KIVA的参考下，将DDM用于液滴和LES。它能够通过增加数值网格的数量来模拟喷雾的两维结构，通过使用CIP技术的应用和优化分手模型的数值粘度来减少数值粘度，并且可以通过货物和三维结构来计算涡流结构的涡流渐变的三维结构。它能够通过提出的新光学器件2捕获大约3 [mm]的液滴信息。2。液滴的空事平均直径范围从10 [μm]到20 [μm]。随着注入压力的增加而降低3。中等大小的液滴跟随涡流的运动，并在喷雾尖端区域生成大规模的涡流，以及在涡流外面外观大的涡流。涡流的二维排列是替代的，三维是涡流的多重形式，例如发夹。较少的

项目成果

期刊论文数量（0）

专著数量（0）

科研奖励数量（0）

会议论文数量（0）

专利数量（0）

Large Eddy Simulation of Diesel Spray Structure in Constant Volume Vessel by Use of KIVALES

利用KVALES对定容容器内柴油喷雾结构进行大涡模拟

DOI：
发表时间：
2006
期刊：
Proc. Int. Conference on Liquid Atomization and Spray Systems No.204
影响因子：
0
作者：
Hori;T.;Senda;J.;Fujimoto;H.et al.
通讯作者：
H.et al.

Large Eddy Simulation of Diesel Spray Combustion with Eddy-Dissipation Model and CIP Method

涡耗散模型和CIP方法对柴油机喷雾燃烧的大涡模拟

DOI：
发表时间：
2007
期刊：
Paper of Society of Automotive Engineers International No.2007-01-0247
影响因子：
0
作者：
Hori;T.;Senda;J.;Fujimoto;H.;et al.
通讯作者：
et al.

Novel Photographic Imaging Method for Diesel Spray Structure with New Lens and Lens and Large Sized Film System

新型镜头和镜头及大尺寸胶片系统柴油喷雾结构摄影成像新方法

DOI：
发表时间：
2006
期刊：
10th Int.Conference on Liquid Atomization and Spray Systems(CD-ROM) F1-02-119
影响因子：
0
作者：
Nakagawa;H.;Senda;J.;H.;Fujimoto;H.;他3名
通讯作者：
他3名

Large Eddy Simulation of Diesel Spray Structure in Constant Volume

定容柴油喷雾结构的大涡模拟