Optimization Design of Gas-Liquid Conveying Pipe Structure for 20 L Spherical Explosion Experimental Device

The paper takes the gas-liquid conveying pipe section in a 20 L spherical explosive device as the research object. The flow pattern structure and cross-section air voids characteristics of gas-liquid two-phase flow in the gas-liquid conveying pipe were studied by numerical simulation. The curvature radius and horizontal pipe length of the gas-liquid conveying pipe section were optimized and designed based on the simulation. The results show that C₆H₁₄, C₇H₁₆, C₈H₁₈, and C₁₀H₂₂ can form stable annular flow under at pressure of 0.6 MPa. The flow structure of C₆H₁₄ and C₇H₁₆ tends to become unstable with increasing pressure. Under the pressure conditions of 0.6–0.9 MPa, when the curvature radius of the gas-liquid conveying pipeline section is 34 mm and the length of the pipeline section is 200–300 mm, most of the liquid phase forms a film and moves along the pipeline wall, and the distribution of the liquid film is relatively homogeneous. The gas phase located in the center of the pipe section flows at high speed with a good gas core. It forms a more stable annular flow pattern structure. The optimization design of the gas-liquid conveying pipeline section can make the measurement of explosion characteristics more accurate, and provide a reference for the study of combustible liquid fuel explosion problems and engineering design.