Explosion-Suppression Characteristics of Nonmetallic Spherical Spacers on Propane-Air Mixtures in Confined Space
The explosion-suppression effects of NSSs on overpressures, flame propagation and flame tip velocities were explored under the initial pressures of 0.2 MPa, 0.3 MPa and 0.4 MPa. All experiments tested in a constant volume combustion bomb (CVCB). Explosion reaction of premixed propane–air gas in a ne...
| Main Authors: | , , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2021-10-01
|
| Series: | Applied Sciences |
| Subjects: | |
| Online Access: | https://www.mdpi.com/2076-3417/11/19/9238 |
| _version_ | 1797516776423030784 |
|---|---|
| author | Yangyang Yu Lehai Liu Junhong Zhang Jun Wang Xiangde Meng Dan Wang |
| author_facet | Yangyang Yu Lehai Liu Junhong Zhang Jun Wang Xiangde Meng Dan Wang |
| author_sort | Yangyang Yu |
| collection | DOAJ |
| description | The explosion-suppression effects of NSSs on overpressures, flame propagation and flame tip velocities were explored under the initial pressures of 0.2 MPa, 0.3 MPa and 0.4 MPa. All experiments tested in a constant volume combustion bomb (CVCB). Explosion reaction of premixed propane–air gas in a new designed CVCB filled with nonmetallic spherical spacers (NSSs) was analyzed. The results showed that overpressures decreased under the different initial pressures. With the increase of filling density, the overpressure decreased, the time to reach explosion overpressure decreased, and the decay rate of explosion overpressure increased. It was also found that the explosion-suppression effects of NSSs on pressures. Flame front could be captured by high-speed schlieren photography. Combustion phenomena were captured including flame propagation, corrugated laminar flame, jet flame, corrugated turbulent flame as well as tulip flame under different initial pressures. Flame tip velocities also were captured. The results demonstrate that flame tip velocities decreased with the increase of filling densities. However, compared with unfilled CVCB, flame tip velocities increased after filling NSSs in CVCB under different initial pressures. NSSs suppressed the explosion overpressure in the cylinder, and promoted the flame propagation. In both cases, NSSs played a dual role. The suppression effect of NSSs was affected by both its suppression and promotion effect on the explosion. This work provides a scientific basis for the effective prevention of explosion accidents with propane–air premixtures and the development of explosion-suppression products. |
| first_indexed | 2024-03-10T07:05:37Z |
| format | Article |
| id | doaj.art-43caa5c8e96f47c390080f52ddd59a5d |
| institution | Directory Open Access Journal |
| issn | 2076-3417 |
| language | English |
| last_indexed | 2024-03-10T07:05:37Z |
| publishDate | 2021-10-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Applied Sciences |
| spelling | doaj.art-43caa5c8e96f47c390080f52ddd59a5d2023-11-22T15:49:47ZengMDPI AGApplied Sciences2076-34172021-10-011119923810.3390/app11199238Explosion-Suppression Characteristics of Nonmetallic Spherical Spacers on Propane-Air Mixtures in Confined SpaceYangyang Yu0Lehai Liu1Junhong Zhang2Jun Wang3Xiangde Meng4Dan Wang5State Key Laboratory of Engine, Tianjin University, Tianjin 300072, ChinaState Key Laboratory of Engine, Tianjin University, Tianjin 300072, ChinaState Key Laboratory of Engine, Tianjin University, Tianjin 300072, ChinaState Key Laboratory of Engine, Tianjin University, Tianjin 300072, ChinaRenai College, Tianjin University, Tianjin 301636, ChinaRenai College, Tianjin University, Tianjin 301636, ChinaThe explosion-suppression effects of NSSs on overpressures, flame propagation and flame tip velocities were explored under the initial pressures of 0.2 MPa, 0.3 MPa and 0.4 MPa. All experiments tested in a constant volume combustion bomb (CVCB). Explosion reaction of premixed propane–air gas in a new designed CVCB filled with nonmetallic spherical spacers (NSSs) was analyzed. The results showed that overpressures decreased under the different initial pressures. With the increase of filling density, the overpressure decreased, the time to reach explosion overpressure decreased, and the decay rate of explosion overpressure increased. It was also found that the explosion-suppression effects of NSSs on pressures. Flame front could be captured by high-speed schlieren photography. Combustion phenomena were captured including flame propagation, corrugated laminar flame, jet flame, corrugated turbulent flame as well as tulip flame under different initial pressures. Flame tip velocities also were captured. The results demonstrate that flame tip velocities decreased with the increase of filling densities. However, compared with unfilled CVCB, flame tip velocities increased after filling NSSs in CVCB under different initial pressures. NSSs suppressed the explosion overpressure in the cylinder, and promoted the flame propagation. In both cases, NSSs played a dual role. The suppression effect of NSSs was affected by both its suppression and promotion effect on the explosion. This work provides a scientific basis for the effective prevention of explosion accidents with propane–air premixtures and the development of explosion-suppression products.https://www.mdpi.com/2076-3417/11/19/9238explosion-suppressionnonmetallic spherical spacersconstant volume combustion bomboverpressureflame propagation |
| spellingShingle | Yangyang Yu Lehai Liu Junhong Zhang Jun Wang Xiangde Meng Dan Wang Explosion-Suppression Characteristics of Nonmetallic Spherical Spacers on Propane-Air Mixtures in Confined Space Applied Sciences explosion-suppression nonmetallic spherical spacers constant volume combustion bomb overpressure flame propagation |
| title | Explosion-Suppression Characteristics of Nonmetallic Spherical Spacers on Propane-Air Mixtures in Confined Space |
| title_full | Explosion-Suppression Characteristics of Nonmetallic Spherical Spacers on Propane-Air Mixtures in Confined Space |
| title_fullStr | Explosion-Suppression Characteristics of Nonmetallic Spherical Spacers on Propane-Air Mixtures in Confined Space |
| title_full_unstemmed | Explosion-Suppression Characteristics of Nonmetallic Spherical Spacers on Propane-Air Mixtures in Confined Space |
| title_short | Explosion-Suppression Characteristics of Nonmetallic Spherical Spacers on Propane-Air Mixtures in Confined Space |
| title_sort | explosion suppression characteristics of nonmetallic spherical spacers on propane air mixtures in confined space |
| topic | explosion-suppression nonmetallic spherical spacers constant volume combustion bomb overpressure flame propagation |
| url | https://www.mdpi.com/2076-3417/11/19/9238 |
| work_keys_str_mv | AT yangyangyu explosionsuppressioncharacteristicsofnonmetallicsphericalspacersonpropaneairmixturesinconfinedspace AT lehailiu explosionsuppressioncharacteristicsofnonmetallicsphericalspacersonpropaneairmixturesinconfinedspace AT junhongzhang explosionsuppressioncharacteristicsofnonmetallicsphericalspacersonpropaneairmixturesinconfinedspace AT junwang explosionsuppressioncharacteristicsofnonmetallicsphericalspacersonpropaneairmixturesinconfinedspace AT xiangdemeng explosionsuppressioncharacteristicsofnonmetallicsphericalspacersonpropaneairmixturesinconfinedspace AT danwang explosionsuppressioncharacteristicsofnonmetallicsphericalspacersonpropaneairmixturesinconfinedspace |