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Observation of vertically ejected plume generated by impact of hollow projectiles

Research Project

Project/Area Number 23K03483
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 17010:Space and planetary sciences-related
Research InstitutionUniversity of Occupational and Environmental Health, Japan

Principal Investigator

門野 敏彦  産業医科大学, 医学部, 教授 (60359198)

Project Period (FY) 2023-04-01 – 2026-03-31
Project Status Granted (Fiscal Year 2023)
Budget Amount *help
¥4,550,000 (Direct Cost: ¥3,500,000、Indirect Cost: ¥1,050,000)
Fiscal Year 2025: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2024: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000)
Fiscal Year 2023: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Keywordsimpact / hollow projectile / ejecta pattern / planetary exploration / sampling method / 衝突 / 小惑星探査 / 放出物
Outline of Research at the Start

「中空」(殻状または内部に空隙を含む構造を持つ)の衝突体を使った室内実験では,従来のクレーター形成実験では見られない標的表面に対して垂直に飛び出す放出物が観測されている.本研究では,中空衝突体を使ってクレーター形成実験を行い,衝突体の形状と衝突速度,衝突角度,標的を構成する粒子のサイズなどをパラメータとして垂直に飛び出す放出物の速度と質量を求め,中空(殻状の構造を持つ)衝突体によって特異な放出物分布が形成されるメカニズムの解明を目指す.

Outline of Annual Research Achievements

Impact experiments in space have been conducted in planetary exploration, using hollow or internally structured projectiles. In laboratory experiments using hollow projectiles conducted to investigate the differences in crater and ejecta from the case of solid projectiles, a plume perpendicular to the target surface has been observed, which has not in conventional cratering experiments using solid projectiles. We conducted crater formation experiments using hollow resin projectiles to understand the mechanism through which vertical plumes form in the case of hollow projectiles. We examined the generation of a vertical plume as a function of the impact velocity, vimp. We found that (i) no vertical plume occurs at vimp < 200 m/s, (ii) the cases with or without a vertical plume are mixed at 200 < vimp < 350 m/s, (iii) no vertical plume occurs at 350 < vimp < 800 m/s, and (iv) a vertical plume occurs at 2 < vimp < 3 km/s. We qualitatively discussed the generation mechanism of the vertical plume using the results of recovered projectiles. Depending on vimp, an empty hole in which there is no projectile materials can be opened along the central axis, resulting in the generation of a vertical plume.

Current Status of Research Progress
Current Status of Research Progress

2: Research has progressed on the whole more than it was originally planned.

Reason

初年度は,応募者の所属機関が所有する高頻度で実験可能な口径10 mmの加速装置(ガス銃)を用い,市販の外径10 mm内径9 mmのポリスチレン球を中空衝突体として衝突速度100 m/sから500m/sまでの範囲で衝突実験を行うことができた.所属機関に既存の高速カメラを使った計測を行い,垂直プリュームの有無を確認して,その速度も解析することができた.垂直プリュームが発生する衝突速度範囲と回収衝突体の破片の様子から,垂直プリュームの発生過程についての理解が進んだ.
このように,まず中空衝突体を使った実験で垂直プリュームの発生過程についての知見が得られたことから,おおむね順調に進展していると言うことができる.

Strategy for Future Research Activity

これまでに中空球を使った衝突実験から垂直プリュームの発生過程についての知見が得られた.これをふまえ,今後は加工された中空球や別の形状の衝突体を用いて検証を行う.
現在の衝突実験装置では球と円柱以外の任意の形状の衝突体を加速することができない.このためにはサボを使う方法(衝突体をサボに装着し,サボを加速,衝突前にサボを分離し衝突体のみ標的に衝突させる)が一般的であるが現有の真空チャンバーではサボを使うことができない.今後はサボ使用可能な真空チャンバーによる多様な形状の衝突体を使った衝突実験を行うことを考えている.
また,実験では垂直プリュームの質量の計測ができていない.この点を補うため数値計算の導入も検討したい.様々な形状の衝突体に対する放出物のパターンを調べ,垂直プリュームが発生する条件の精度を上げ垂直プリュームの質量を求める.
実験と数値計算での放出物パターンの比較から,より効率よく標的物質を放出させる形状や衝突条件を見いだし,惑星探査でのサンプラー開発仁応用することを目指す.

Report

(1 results)
  • 2023 Research-status Report
  • Research Products

    (6 results)

All 2024 2023

All Journal Article (3 results) (of which Peer Reviewed: 3 results,  Open Access: 2 results) Presentation (3 results) (of which Int'l Joint Research: 2 results)

  • [Journal Article] Sticking of Fine Particles in High-velocity Impact: Application to Size Distribution of Dust Grains in a Debris Disk2024

    • Author(s)
      Toshihiko Kadono, Hiroshi Kobayashi, and Mitsuru Yokoyama
    • Journal Title

      The Astrophysical Journal

      Volume: 960 Issue: 1 Pages: 38-38

    • DOI

      10.3847/1538-4357/acfee6

    • Related Report
      2023 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Experimental investigation of impact close to the edge of boulders2023

    • Author(s)
      Kadono Toshihiko、Nakamura Akiko M.、Suetsugu Ryo、Chang Daehyo、Shiramizu Seiya、Takatsu Issei、Ogawa Koki、Nomura Keita、Nagaashi Yuuya、Murakami Yuichi、Yamasaki Yutaro、Shiomoto Junpei、Okamoto Takaya、Tanaka Shigeru、Kawai Nobuaki
    • Journal Title

      Planetary and Space Science

      Volume: 236 Pages: 105763-105763

    • DOI

      10.1016/j.pss.2023.105763

    • Related Report
      2023 Research-status Report
    • Peer Reviewed
  • [Journal Article] Observation of Vertically Ejected Plumes Generated by the Impact of Hollow Projectiles at Various Velocities2023

    • Author(s)
      Kadono Toshihiko、Suzuki Ayako I.、Suetsugu Ryo、Maeda Ryusei、Watanabe Tatsuya、Miyaji Nina、Murayama Ayaka、Yoshida Fumi、Higuchi Arika、Shimaki Yuri、Hasegawa Sunao
    • Journal Title

      The Planetary Science Journal

      Volume: 4 Issue: 5 Pages: 82-82

    • DOI

      10.3847/psj/accbbb

    • Related Report
      2023 Research-status Report
    • Peer Reviewed / Open Access
  • [Presentation] Pattern in ejecta curtain generated by the impact into granular targets of various sized particles2023

    • Author(s)
      T. Kadono
    • Organizer
      Japan Geoscience Union Meeting 2023
    • Related Report
      2023 Research-status Report
    • Int'l Joint Research
  • [Presentation] エジェクタカーテン中のパターンと 標的粒子のサイズ分布2023

    • Author(s)
      T. Kadono
    • Organizer
      日本惑星科学会秋季講演会
    • Related Report
      2023 Research-status Report
  • [Presentation] Sticking of microparticles in high-velocity impact and implication for disk evolution2023

    • Author(s)
      T. Kadono, H. Kobayashi
    • Organizer
      Protostars and planets VII
    • Related Report
      2023 Research-status Report
    • Int'l Joint Research

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Published: 2023-04-13   Modified: 2024-12-25  

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