Open AccessInitial Moving Mechanism of Densely-Packed Particles Driven by a Planar Shock Wave
Author(s) -
Hua Lv,
Zhongqi Wang,
Yunming Zhang,
Jian Ping Li
Publication year - 2021
Publication title -
shock and vibration
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.418
H-Index - 45
eISSN - 1875-9203
pISSN - 1070-9622
DOI - 10.1155/2021/8867615
Subject(s) - shock wave , mechanics , drag , particle (ecology) , planar , mechanism (biology) , reflection (computer programming) , shock (circulatory) , physics , materials science , classical mechanics , geology , medicine , oceanography , computer graphics (images) , quantum mechanics , computer science , programming language
The initial moving mechanism of densely packed particles driven by shock waves is unclear but vital for the next accurate calculation of the problem. Here, the initial motion details are investigated experimentally and numerically. We found that before particles show notable motion, shock waves complete reflection and transmission, and stress waves propagate downstream on particle skeleton. Due to the particle stress wave, particles successively accelerate and obtain an axial velocity of 6–8 m/s. Then, the blocked gas pushes the upstream particles integrally to move downstream, while the gas flow in the pores drags the downstream particles to separate dramatically and accelerate to the velocity of 60–70 m/s. This gas push-drag dual mechanism transforms densely packed particles into a dense gas-particle cloud, which behaves as the expansion phenomena of the dense particles.