[Oral Presentation]爆炸驱动的颗粒环膨胀不稳定性

Organized By

Hohai University

Monash University

Co-organized by

Southeast University

Jiangxi University of Science and Technology

Northeast University

DUT-BSU Scientific Research and Innovation Center

Suzhou University of Science and Technology

State Key Laboratory of Structural Analysis, Optimization and CAE Software for Industrial Equipment

Sponsoring agency

KELI SDEM Software (Dalian) Co., Ltd.

Sugon Smart Computing Information Technology Co., Ltd.

Beijing Paratera Technology Co., Ltd.

Simpop Information Technology Co., Ltd.

Important Dates

Conference Announcement

December 2023, release First Round Announcement
Abstract Submission Deadline
March 31^th, 2024
Paper Submission Deadline
April 30^th, 2024
Registration
From January 1^st, 2024
Conference Schedule
May 31^st (Friday), 2024 On-Site Registration
June 1^st to 3^rd, 2024 Conference

爆炸驱动的颗粒环膨胀不稳定性

ID：293 Submission ID：282 View Protection：ATTENDEE Updated Time：2024-05-01 11:45:05 Hits：529 Oral Presentation

Start Time：Pending （Asia/Shanghai）

Duration：Pending

Session：[No Session] » [No Session Block]

No files

Abstract

本文研究了径向发散的柱面冲击波作用下颗粒环外界面类Richtmyer-Meshkov（RM）不稳定性的演化规律。冲击载荷下颗粒环外界面演化产生类RM不稳定性的“尖钉”、“气泡”结构。冲击波作用于颗粒环使其产生初始的横向颗粒流动，颗粒间相互碰撞并不断向外运动直至颗粒环外界面，随后稀疏波开始驱动外界面膨胀运动，界面反相，扰动振幅线性增长后逐渐分散。由于压力梯度分布的非均匀性及爆轰管内波系震荡，大当量比条件下的颗粒环膨胀缓慢，无法脱离中心流场作用域，负压影响强烈，颗粒环经过复杂的运动后出现明显内缩最终形成类“六棱柱状雪花”。而小当量比条件下由于颗粒环内压力梯度分布较为均匀，颗粒环不断膨胀分散。研究发现，局部颗粒流动的作用维持了扰动振幅持续增长，并驱动颗粒环界面失稳后产生相应的形态变化。

Keywords

颗粒介质，多相流不稳定性，冲击载荷

Speaker

林敏

北京理工大学

Submission Author

林敏北京理工大学

薛琨北京理工大学

Sponsored By

Hohai University

Panel of Computational Mechanics on Granular Materials, Working Party of Computational Mechanics, Chinese Society of Theoretical and Applied Mechanics

Jiangsu Society of Theoretical and Applied Mechanics