# Visualization System for 3D Structural Analysis of Fuel Spray

Sensors, Energy

Environmental Sciences

Key Phrases: Advances visualization technology, Responds to needs of job site, Transfers technology to a local company

Organizations Involved

○ Masaaki Kawahashi, Professor,

Graduate School of Science and Engineering, Saitama University

O Hironori Matsuoka, President, Nippon-Nozzle Precision Machine Co., Ltd.

Prof. Kawahashi

Pres. Matsuoka

## 【Abstract】

In response to a request by Nippon-Nozzle Precision Machine Co. Ltd. for technical assistance in designing a new nozzle, the Fluid Dynamic Research Group of Saitama University developed a system for analyzing the 3D structure of fuel spray. The system was developed by combining the technology of qualitative visualization with the image processing of laser technology. While the system has been transferred to Nippon-Nozzle, collaborative research with Saitama University continues, and patents for the technology, for which practical uses have been established, are presently being applied for.

## [Summary of the technology transfer]

## Technological Impact

By combining optical and image processing technologies, a diagnostic tool for analyzing the 3D structure of fuel spray has been developed that can simultaneously measure a droplet's diameter and 3D velocity. Since the structure of fuel spray is an important factor in the efficiency of combustion, fuel spray diagnostic technology is important not only for designing more efficient nozzles for internal combustion engines but for analyzing various kinds of sprays. Thus, the diagnostic capabilities of the technology can be applied to various technical uses.

## ●Social Impact

As more people have become concerned with the perilous state of the earth's environment, energy-saving technology has become a crucial element in addressing environmental issues. Since the combustion engine is one of the primary contributors to environmental destruction, emissions control is of paramount importance, and emissions are reduced with engine efficiency. Thus, by improving the efficiency of combustion, fuel spray diagnostic technology also decreases destructive effects on the environment.

## Project Background

Nippon-Nozzle initially consulted Saitama University for technical support in developing an evaluation system that would improve their product's reliability. As a result, a collaborative research project ensued that designed a new fuel spray diagnostic technology.

## Funding History

The university funded the first steps of the technical development before the project received grants from the following sources: 2000-2005 Nippon-Nozzle Precision Machine

Co. Ltd. Research Fund

2002-2004 JSPS Grant

## I ntellectual property protection

Number of patent : 1 (domestic)

Diagnostic method and system for droplet state,

Pat. No. 3875653

Optics for Measurement System

Illuminated by a pulsed laser light-sheet, the scattering light from droplets in fuel spray is captured by a stereoscopic camera system. Image processing then reconstructs the diameter and 3D velocity of the droplets.

Number of application : 1 (domestic)

3D Velocity

Droplet Diameter

Pat. Listed No. 2006-170910

Examples of Results Measured

## Turning point in the Project

OSystematic support for making academic research more relevant to societal needs is crucial for technological innovation.

O Making the university more welcoming and accessible to the local community can increase mutual understanding and collaborative opportunities.

For more information, contact: Seijii Ichikawa, Cooperative Research Center, Saitama University, +81-48-858-3849, s_ichikawa@post.saitama-u.ac.jp