Numerical Study on Effects of Pipeline Geometric Parameters on Release Characteristics of Gas Extinguishing Agent
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 chara...
| Main Authors: | , , , , , , |
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| Format: | Article |
| Language: | English |
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MDPI AG
2021-09-01
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| Series: | Symmetry |
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| Online Access: | https://www.mdpi.com/2073-8994/13/10/1766 |
| _version_ | 1797513165677789184 |
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| author | Quanwei Li Zongyu Li Ruiyu Chen Zhaojun Zhang Hui Ge Xia Zhou Renming Pan |
| author_facet | Quanwei Li Zongyu Li Ruiyu Chen Zhaojun Zhang Hui Ge Xia Zhou Renming Pan |
| author_sort | Quanwei Li |
| collection | DOAJ |
| description | 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 (<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mi>d</mi><msub><mi>P</mi><mrow><mi>m</mi><mi>a</mi><mi>x</mi></mrow></msub></mrow></semantics></math></inline-formula>) has a good quadratic function relationship with the pipeline diameter (<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mi>D</mi></semantics></math></inline-formula>) and the functional relationship is <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mi>d</mi><msub><mi>P</mi><mrow><mi>m</mi><mi>a</mi><mi>x</mi></mrow></msub><mo>=</mo><mo>−</mo><mn>22.224</mn><mo>+</mo><mn>2.782</mn><mi>D</mi><mo>+</mo><mn>0.089</mn><msup><mi>D</mi><mn>2</mn></msup><mo>,</mo></mrow></semantics></math></inline-formula> which means that the peak value increased significantly with the increase in the pipeline diameter. Moreover, when the pipeline diameter is 25 <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mi>mm</mi></mrow></semantics></math></inline-formula>, the average pressure drop rate of the vessel is about 35.02 <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mi>MPa</mi><mo>/</mo><mi mathvariant="normal">s</mi></mrow></semantics></math></inline-formula>, which is 5.97 times the value of the average pressure drop rate when the pipeline diameter is 10 <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mi>mm</mi></mrow></semantics></math></inline-formula>. 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. |
| first_indexed | 2024-03-10T06:11:51Z |
| format | Article |
| id | doaj.art-dadcf981ec96466ca1b9fe1c912b08f1 |
| institution | Directory Open Access Journal |
| issn | 2073-8994 |
| language | English |
| last_indexed | 2024-03-10T06:11:51Z |
| publishDate | 2021-09-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Symmetry |
| spelling | doaj.art-dadcf981ec96466ca1b9fe1c912b08f12023-11-22T20:08:47ZengMDPI AGSymmetry2073-89942021-09-011310176610.3390/sym13101766Numerical Study on Effects of Pipeline Geometric Parameters on Release Characteristics of Gas Extinguishing AgentQuanwei Li0Zongyu Li1Ruiyu Chen2Zhaojun Zhang3Hui Ge4Xia Zhou5Renming Pan6School of Chemistry and Chemical Engineering, Nanjing University of Science and Technology, Nanjing 210094, ChinaPoly Orica Management Co., Ltd., Weihai 264200, ChinaSchool of Chemistry and Chemical Engineering, Nanjing University of Science and Technology, Nanjing 210094, ChinaSchool of Chemistry and Chemical Engineering, Nanjing University of Science and Technology, Nanjing 210094, ChinaSchool of Chemistry and Chemical Engineering, Nanjing University of Science and Technology, Nanjing 210094, ChinaSchool of Chemistry and Chemical Engineering, Nanjing University of Science and Technology, Nanjing 210094, ChinaSchool of Chemistry and Chemical Engineering, Nanjing University of Science and Technology, Nanjing 210094, ChinaIn 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 (<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mi>d</mi><msub><mi>P</mi><mrow><mi>m</mi><mi>a</mi><mi>x</mi></mrow></msub></mrow></semantics></math></inline-formula>) has a good quadratic function relationship with the pipeline diameter (<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mi>D</mi></semantics></math></inline-formula>) and the functional relationship is <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mi>d</mi><msub><mi>P</mi><mrow><mi>m</mi><mi>a</mi><mi>x</mi></mrow></msub><mo>=</mo><mo>−</mo><mn>22.224</mn><mo>+</mo><mn>2.782</mn><mi>D</mi><mo>+</mo><mn>0.089</mn><msup><mi>D</mi><mn>2</mn></msup><mo>,</mo></mrow></semantics></math></inline-formula> which means that the peak value increased significantly with the increase in the pipeline diameter. Moreover, when the pipeline diameter is 25 <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mi>mm</mi></mrow></semantics></math></inline-formula>, the average pressure drop rate of the vessel is about 35.02 <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mi>MPa</mi><mo>/</mo><mi mathvariant="normal">s</mi></mrow></semantics></math></inline-formula>, which is 5.97 times the value of the average pressure drop rate when the pipeline diameter is 10 <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mi>mm</mi></mrow></semantics></math></inline-formula>. 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.https://www.mdpi.com/2073-8994/13/10/1766aircraft fire extinguishing systempipeline networkgas–liquid two-phase flowgas extinguishing agentrelease characteristics |
| spellingShingle | Quanwei Li Zongyu Li Ruiyu Chen Zhaojun Zhang Hui Ge Xia Zhou Renming Pan Numerical Study on Effects of Pipeline Geometric Parameters on Release Characteristics of Gas Extinguishing Agent Symmetry aircraft fire extinguishing system pipeline network gas–liquid two-phase flow gas extinguishing agent release characteristics |
| title | Numerical Study on Effects of Pipeline Geometric Parameters on Release Characteristics of Gas Extinguishing Agent |
| title_full | Numerical Study on Effects of Pipeline Geometric Parameters on Release Characteristics of Gas Extinguishing Agent |
| title_fullStr | Numerical Study on Effects of Pipeline Geometric Parameters on Release Characteristics of Gas Extinguishing Agent |
| title_full_unstemmed | Numerical Study on Effects of Pipeline Geometric Parameters on Release Characteristics of Gas Extinguishing Agent |
| title_short | Numerical Study on Effects of Pipeline Geometric Parameters on Release Characteristics of Gas Extinguishing Agent |
| title_sort | numerical study on effects of pipeline geometric parameters on release characteristics of gas extinguishing agent |
| topic | aircraft fire extinguishing system pipeline network gas–liquid two-phase flow gas extinguishing agent release characteristics |
| url | https://www.mdpi.com/2073-8994/13/10/1766 |
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