Study on Hypersonic Flow for Astrobiology around Icy Entry Object Based on High Temperature Gas Dynamics of Atmospheric Entry Vehicle

基于进入大气层飞行器高温气体动力学的冰入天体周围高超声速流研究

• 批准号: 21360413
• 负责人: SUZUKI Kojiro
• 金额: $ 11.65万
• 依托单位: The University of Tokyo
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 2009
• 资助国家: 日本
• 起止时间: 2009 至 2011
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-21360413/
• 关键词: 大気圏突入; 極超音速流; 熱化学非平衡流; アブレーション; 氷天体; アストロバイオロジー; 風洞実験; 数値流体力学; 極超音速; 高エンタルピー流体

On the early earth, the atmospheric entry of an extraterrestrial icy object is thought to occur frequently. In this study, the hypersonic and high temperature flow around such an entry object has been investigated. The hypersonic wind tunnel experiment using a spherical ice piece reveals the phenomenon that the melted ice due to the aerodynamic heating is re-frozen in the shoulder region to form a brim-like icy structure around the body. The numerical analysis of the chemically reacting high temperature flow indicates that in the high temperature flow behind the shock wave, hydrogen cyanide, which is one of the important prebiotic materials, is produced from the ablation gas of ice and the early earth's atmosphere composed of carbon dioxide and nitrogen molecule. The hydrogen cyanide produced around the entry object is distributed into the atmosphere behind it.

在早期地球上，外星冰质物体进入大气层被认为经常发生。在这项研究中，研究了此类进入物体周围的高超音速和高温流动。使用球形冰块的高超声速风洞实验揭示了由于气动加热而融化的冰在肩部区域重新冻结，在身体周围形成边缘状冰结构的现象。对高温流化学反应的数值分析表明，在激波后的高温流中，冰的烧蚀气体和由碳组成的早期地球大气产生了氰化氢，这是重要的生命起源物质之一。二氧化氮和氮分子。进入物体周围产生的氰化氢分布到其后面的大气中。

项目成果

Hypersonic Aerothermodynamics on Atmospheric Entry of Icy Body and Its Potential Contribution to Astrobiology

冰体进入大气层的高超声速空气热动力学及其对天体生物学的潜在贡献

• 发表时间: 2010
• 作者: K. Suzuki;O. Imamura
• 通讯作者: O. Imamura

Hypersonic Aerothermodynamics on Atmospheric Entry of Icy Body and Its Potential Contribution to Astrobiology

冰体进入大气层的高超声速空气热动力学及其对天体生物学的潜在贡献

• 发表时间: 2010
• 作者: 鈴木宏二郎; 今村宰
• 通讯作者: 今村宰

Visualization of Ablation and Spallation of Icy Object in Hypersonic Flow at Mach Number 7

7 马赫高超音速流中冰物体烧蚀和散裂的可视化

• 发表时间: 2012
• 作者: K.Suzuki; O.Imamura; T.Okunuki
• 通讯作者: T.Okunuki

A Study on Ablation Behavior of Spherical Ice Piece in Hypersonic Flow

高超声速流中球形冰块烧蚀行为研究

• 发表时间: 2010
• 作者: Imamura; O.; Okunuki; T.; Suzuki; K.
• 通讯作者: K.

Thermochemical Nonequilibrium Flow Analysis for Atmospheric Entry of Icy Objects

冰物体进入大气的热化学非平衡流动分析

• 发表时间: 2011
• 作者: Kojiro Suzuki