Detailed validation of the new atomization concept derived from drop tower experiments--Aimed at developing a turbulent atomization simulator (ATOMIZATION) - 07.29.14

Overview | Description | Applications | Operations | Results | Publications | Imagery
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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.
 

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This content was provided by Akira Umemura, and is maintained in a database by the ISS Program Science Office.
Information provided courtesy of the Japan Aerospace and Exploration Agency (JAXA).

Experiment Details

OpNom

Principal Investigator(s)

  • Akira Umemura, Department of Aerospece Engineering Graduate School of Engineering Nagoya University, Nagoya, Japan

  • Co-Investigator(s)/Collaborator(s)
  • Takehiro Himeno, University of Tokyo, Japan
  • Junji Shinjo, Japan
  • Jun Osaka, Nagoya University, Japan
  • Masao Kikuchi, Japan

  • Developer(s)
    Information Pending
    Sponsoring Space Agency
    Japan Aerospace Exploration Agency (JAXA)

    Sponsoring Organization
    Information Pending

    Research Benefits
    Information Pending

    ISS Expedition Duration
    March 2014 - September 2014

    Expeditions Assigned
    39/40

    Previous ISS Missions
    Information Pending

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    Experiment Description

    Research Overview

    • 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.

    Description

    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.

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    Applications

    Space Applications

    The results from the ATOMIZATION experiment provides key information to maximize efficiency of the rocket engines used in the space program.
     

    Earth Applications

    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.
     

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    Operations

    Operational Requirements

    Crew support for adjustment of camera focus, High speed observation of liquid waters atomization process to reveal the atomization process.

    Operational Protocols

    ATOMIZATION is launched aboard ORB3. ATOMIZATION as well as its tests are unstowed from CTB and mounted in the MSPR/WV. Crew sets up a water syringe and adjusts focusing of high speed camera. After that, ground operators carry out experiments. Water is injected from the nozzle. Injected flow is subjected to the atomization process. These 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. Crew member is requested to replace the syringe and the water collector. Crew time for the experiment is estimated as 12 hours.

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    Results/More Information

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    Related Websites
    Nagoya University Aerospace Engineering

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    Imagery