Simulation of piston acceleration in a single-stage combustion light gas gun

Bykov, N. V.; Shestakov, I. E.

doi:10.1063/5.0035726

Cited by 2 publications

(1 citation statement)

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“…It was found that the flow characteristics of the agent were significantly affected by the rupture surface area and the pipeline diameter mainly due to the change of the flow resistance. Using FLUENT software, Bykov et al [18] performed the simulation of piston acceleration process in the combustion light-gas gun and validated the simulation models based on experimental data. It is shown that the developed models could provide adequate accuracy for determining the system's intraballistic characteristics.…”

Section: Introductionmentioning

confidence: 99%

Numerical Study on Effects of Pipeline Geometric Parameters on Release Characteristics of Gas Extinguishing Agent

Li²,

Chen

et al. 2021

Symmetry

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In order to guide the optimization design of the pipeline network of the aircraft-fixed gas fire extinguishing system and improve its fire extinguishing performance, FLUENT software was used to simulate the influence of pipeline parameters such as diameter, length, and roughness on the release characteristics of the fire extinguishing agent. It can be found that the extinguishing agent can be divided into liquid and vapor extinguishing agents in the fire extinguishing pipeline system during the release. The spatial distribution and proportion of the liquid and vapor extinguishing agents are asymmetric. Results show that the peak value of the pressure drop rate (dPmax) has a good quadratic function relationship with the pipeline diameter (D) and the functional relationship is dPmax=−22.224+2.782D+0.089D2, which means that the peak value increased significantly with the increase in the pipeline diameter. Moreover, when the pipeline diameter is 25 mm, the average pressure drop rate of the vessel is about 35.02 MPa/s, which is 5.97 times the value of the average pressure drop rate when the pipeline diameter is 10 mm. With the increase in the pipeline diameter, the release time decreases significantly, the mass flow rate increases obviously, while the gasification ratio decreases rapidly at first and then increases slightly. The pipeline length also has a significant influence on the release characteristics of the extinguishing agent. With the increase in the pipeline length, the release time and the gasification ratio increase linearly, while the mass flow rate decreases linearly. Compared with the pipeline diameter and pipeline length, the influence of the pipeline roughness on the release characteristics of the extinguishing agent is weak. With the increase in the pipeline roughness, the release time and the gasification ratio of the extinguishing agent increases slowly, while the mass flow rate decreases slowly.

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Section: Introductionmentioning

confidence: 99%