Damage mechanism of detonation wave to piston in combustion chamber with cone-type roof

Yao Chun-de; Xu Han; Yao An-ren; Tang Chao

doi:10.11883/1001-1455(2015)01-0057-08

Volume 35 Issue 1

Feb. 2015

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Yao Chun-de, Xu Han, Yao An-ren, Tang Chao. Damage mechanism of detonation wave to piston in combustion chamber with cone-type roof[J]. Explosion And Shock Waves, 2015, 35(1): 57-64. doi: 10.11883/1001-1455(2015)01-0057-08

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Damage mechanism of detonation wave to piston in combustion chamber with cone-type roof

doi: 10.11883/1001-1455(2015)01-0057-08

1.
State Key Laboratory of Engines, Tianjin University, Tianjin 300072, China
2.
School of Materials Science and Engineering, Tianjin University, Tianjin 300072, China

Received Date: 2013-05-28
Rev Recd Date: 2013-09-05
Publish Date: 2015-01-25

Abstract

Abstract

For the internal-combustion engine, super knock produced by new combustion system may cause detonation in combustion chamber, which may damage the piston. 2D numerical simulation which is conducted by Ansys Fluent is used to investigate the propagation and reflection of detonation wave produced in combustion chamber with cone type roof. The overpressure distribution on top piston surface is obtained. Numerical simulation showed that the detonation wave could converge in special zone because of the shape of combustion chamber, which made the overpressure there much higher than that in the other zones. The numerical results were compared with the experimental damaged pistons, and it's found that the converging of the detonation wave found in numerical simulation could be the reason that causes the piston local region damaged under super knock. The results obtained in the study provided an important reference to the shape design of combustion chamber in order to avoid piston from being damaged by the detonation wave.
- mechanics of explosion,
- damaged piston,
- shock wave,
- combustion chamber shape,
- convergence

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References(21)

References

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