Evolution Law of Hydrogen Detonation Cellular Structure under the Effect of Rigid and Flexible Porous Materials
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摘要: 多孔材料作为高效吸波耗能介质，广泛应用于爆轰衰减研究中。为进一步揭示多孔材料的抑爆机理，系统研究了柔性（海绵）和刚性（金属丝网）2种典型多孔材料对氢氧爆轰胞格结构的影响，以及海绵和金属丝网厚度、孔隙率对爆轰胞格结构、尺寸等参数的影响。采用烟熏板技术记录爆轰波的胞格图案，并计算得到爆轰胞格尺寸；采用压力传感器记录爆轰波到达时间，进而计算得到爆轰波的平均传播速度。结果表明，爆轰胞格结构与海绵和金属丝网的厚度、孔隙率密切相关，此外研究发现了多个爆轰传播阶段，包括爆轰失效、加速和再起爆。爆轰胞格尺寸也与海绵和金属丝网的厚度、孔隙率密切相关，增大多孔材料厚度和减小孔隙率均能显著增大爆轰胞格尺寸。通过对比分析海绵与金属丝网对爆轰胞格尺寸的影响发现，在相同条件下，刚性多孔材料对爆轰的抑制作用更强，但这种差距会随着多孔材料厚度的增加而减小。最后，通过引入无量纲参数DH/λ量化分析爆轰传播极限。对于柔性和刚性多孔材料而言，其爆轰传播极限可分别近似量化为DH/λ≈3.0和DH/λ≈3.1。Abstract: As highly efficient absorbing and dissipating materials, porous materials were widely used in the study of detonation wave attenuation. In order to further explore the mechanism of explosion suppression by porous materials, the effects of typical flexible (sponge) and rigid (wire mesh) porous materials on the detonation cellular structure for hydrogen and oxygen mixture were investigated systematically. The effects of thickness and porosity of sponge and wire mesh on the structure and size of detonation cell were discussed in detail. The cellular pattern of detonation wave was recorded by using smoke plate technology, and the cell size was calculated. The pressure sensors were used to record the arrival time of the detonation wave, and the average propagation velocity of detonation wave was obtained. The results show that the detonation cellular structure closely depends on the thickness and porosity of sponge and wire mesh, and three phases of the propagation can be observed in the tube, including detonation failure, acceleration and re-initiation. In addition, size of the detonation cell is also closely related to the thickness and porosity of sponge and wire mesh. Increasing the thickness of porous materials and decreasing the porosity both can increase the size of the detonation cell. By comparing the effects of sponge and wire mesh on the detonation cellular structure, it can be found that at the same initial condition, the rigid porous material has a stronger inhibition effect on detonation. But the difference will be gradually decreased with the increase of the thickness of the porous materials. Finally, the limit of the detonation propagation is analyzed quantitatively by introducing the dimensionless parameter DH/λ. For flexible and rigid porous materials, the detonation limit can be nearly quantified as DH/λ≈3.0 and DH/λ≈3.1.
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图 3 不同初始压力下光滑管道内的爆轰胞格结构（单位：mm）
Figure 3. Structures of detonation cell in smooth tube under different initial pressure (Unit: mm)
图 4 光滑管道内爆轰胞格尺寸与初始压力的关系
Figure 4. Relationships between detonation cell size and initial pressure in smooth tube
图 5 p0=20 kPa时不同海绵厚度及PPI孔隙率下的爆轰胞格结构（单位：mm）
Figure 5. Detonation cellular structures for different thickness of sponge and PPI porosity at p0=20 kPa (Unit: mm)
图 6 p0=20 kPa时海绵厚度对爆轰胞格尺寸的影响
Figure 6. Effect of sponge thickness on detonation cell size at p0=20 kPa
图 7 p0=20 kPa时海绵孔隙率对爆轰胞格尺寸的影响
Figure 7. Effect of sponge porosity on detonation cell size at p0=20 kPa
图 8 p0=20 kPa、hs=30 mm时不同孔隙率下的爆轰胞格结构（单位：mm）
Figure 8. Structures of the detonation cell under different sponge porosity conditions at p0=20 kPa and hs=30 mm (Unit: mm)
图 9 海绵厚度为30 mm时爆轰波的平均传播速度与氢气摩尔分数的关系
Figure 9. Relationships between the average velocity of detonation wave and hydrogen mole fraction at 30 mm sponge thickness
图 10 p0=20 kPa、nw=20PPI时不同金属网厚度下的爆轰胞格结构（单位：mm）
Figure 10. Structures of the detonation cell under different wire mesh thickness conditions at p0=20 kPa and nw=20PPI (Unit: mm)
图 11 nw=20PPI时金属网厚度对爆轰胞格尺寸的影响
Figure 11. Effect of wire mesh thickness on detonation cell size at nw=20PPI
图 12 p0=20 kPa、hw=10 mm时不同孔隙率下的爆轰胞格结构（单位：mm）
Figure 12. Structures of the detonation cell under different wire mesh porosity conditions at p0=20 kPa and hw=10 mm (Unit: mm)
图 13 p0=20 kPa、hw=10 mm时金属网孔隙率对爆轰胞格尺寸的影响
Figure 13. Effect of wire mesh porosity on detonationcell size at p0=20 kPa and hw=10 mm
图 14 p0=20 kPa时金属网和海绵厚度对爆轰胞格尺寸的影响
Figure 14. Effect of metal mesh and sponge thickness on detonation cell size at p0=20 kPa
表 1 多孔材料的阻塞比
Table 1. Blockage ratio of porous material
No. Thickness of porous materials/mm Internal diameter of pipe/mm Blockage ratio 1 10 60 0.167 2 20 60 0.333 3 30 60 0.500 
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