Detailed validation of the new atomization concept derived from drop tower experiments--Aimed at developing a turbulent atomization simulator (ATOMIZATION) - 05.25.16
The ATOMIZATION experiment investigates the liquid spraying process in microgravity, on board the Japanese Experimental Module (JEM), in order to confirm the new atomization concept developed from drop tower experiments on Earth. This new concept can predict correct breakup positions of a liquid stream, or ligament, which provides key information to improve spray combustion processes inside rocket and jet engines.
Science Results for Everyone
Information Pending Experiment Details
Akira Umemura, Department of Aerospece Engineering Graduate School of Engineering Nagoya University, Nagoya, Japan
Takehiro Himeno, University of Tokyo, Japan
Junji Shinjo, Japan
Jun Osaka, Nagoya University, Japan
Masao Kikuchi, Japan
Sponsoring Space Agency
Japan Aerospace Exploration Agency (JAXA)
Japan Aerospace Exploration Agency
ISS Expedition Duration 1
March 2014 - September 2014; March 2015 - March 2016; March 2016 - September 2017
- The authour found the detailed liquid atomization concept from the drop tower experiments. According to the concept, the break-up position of atomization process is affected by cumulative process of self-instability wave propagation along the flow. In order to validate the concept, micro-G experiment is needed.
- The conventional atomization concept developped by the Lord Rayleigh 130 years ago will be modified. We will obtain quantitative understanding of liquids atomization process. It can eventually optimize the spary combustion.
- The study, aims at quantitative understanding of the liquids atomization process, has an impact on Physics. It provides key information for improving effciency of spray combustion engine.
The investigator found the detailed liquid atomization concept from the drop tower experiments. According to the concept, the break-up position of atomization process is affected by cumulative process of self-instability capillary wave propagation along the flow. In order to validate the concept on a flow especially in a low-speed condition, the micro-G experiment is needed. ATOMIZATION facility can create a water jet in micro-G. Since the water jet is subject to the atomization process, it spontaneously split into droplets. These atomization processes are taken by a high-speed camera, video-image is downlinked to the ground. Breakup locations are analyzed. Comparison with various sample conditions reveals how atomization mechanism is affected by cumulative process of self-instability wave propagation along the flow. This study, aims at quantitative understanding of the liquids atomization process, has impact on Physics. The conventional atomization concept developed by the Lord Reighleigh 130 years ago is modified. It provides key information for improving efficiency of engine via construction of a turbulent atomization simulator.
The results from the ATOMIZATION experiment provides key information to maximize efficiency of the rocket engines used in the space program.
An in-depth understanding of the atomization process will improve the design and efficiency of the spray of liquid fuels into combustion chambers in jet engines used in aircraft.
Operational Requirements and Protocols
Decadal Survey Recommendations
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Nagoya University Aerospace Engineering