Energy convergence of shock waves and its destruction mechanism in cone-roof combustion chambers

Han, Xu; Yao, Anren; Yao, Chunde; Gao, Jian

doi:10.1016/j.enconman.2016.09.034

Cited by 14 publications

(2 citation statements)

References 22 publications

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“…Converging shocks are used in technology (SW ignition of fusion [2] and concave detonation-driven shocks [3] ) basic science (converging SW triggered star formation, supernova explosions and void collapses [4] and pressure amplification setups [5] ) and medicine (extracorporeal SW lithotripsy [6] , drug delivery by SW focusing [7] , SW mediated cell transfection [8] and high-intensity focused ultrasound (HIFU) [9] ). Detrimental effects of SW focusing are found in aeronautics (superbooms caused by a turning maneuver of a supersonic aircraft [10] ) automotive industry (damage of combustion chambers [11] ) and also medicine (possible collateral tissue damage following laser-based ophthalmic procedures [12] , [13] ).…”

Section: Introductionmentioning

confidence: 99%

Laser-induced cavitation bubbles and shock waves in water near a concave surface

Požar

Agrež

Petkovšek

2021

Ultrasonics Sonochemistry

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Section: Introductionmentioning

confidence: 99%

Laser-induced cavitation bubbles and shock waves in water near a concave surface

Požar

Agrež

Petkovšek

2021

Ultrasonics Sonochemistry

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“…With the continuous improvement of power density, there is an occasional and destructive knock named superknock in the low speed and heavy load conditions [3,4]. Super-knock with a high level of destructiveness is an important obstacle to the development of high power density and thermal efficiency engines [5,6].…”

Section: Introductionmentioning

confidence: 99%

Investigation into the Relationship between Super-Knock and Misfires in an SI GDI Engine

et al. 2021

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The super-knock poses new challenges for further increasing the power density of spark ignition (SI) engines. The critical factors and mechanism connecting regarding the occurrence of super-knock are still unclear. Misfire is a common phenomenon in SI engines that the mixture in cylinder is not ignited normally, which is often caused by spark plug failure. However, the effect of misfire on engine combustion has not been paid enough attention to, particularly regarding connection to super-knock. The paper presents the results of experimental investigation into the relationship between super-knock and misfires at low speed and full load conditions. In this work, a boosted gasoline direct injection (GDI) engine with an exhaust manifold integrated in the cylinder head was employed. Four piezoelectric pressure transducers were used to acquire the data of a pressure trace in cylinder. The spark plugs of four cylinders were controlled manually, of which the ignition system could be cut off as demanded. In particular, a piezoelectric pressure transducer was installed at the exhaust pipe before the turbocharger to capture the pressure traces in the exhaust pipe. The results illustrated that misfires in one cylinder would cause super-knock in the other cylinders as well as the cylinder of itself. After one cylinder misfired, the unburned mixture would burn in the exhaust pipe to produce oscillating waves. The abnormal pressure fluctuation in the exhaust pipe was strongly correlated with the occurrence of super-knock. The sharper the pressure fluctuation, the greater the intensity of knock in the power cylinder. The cylinder whose exhaust valve overlapped with the exhaust valve of the misfired cylinder was prone to super-knock.

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Investigate the shock focusing under a single vortex disturbance using 2D Saint-Venant equations with a shock-capturing scheme

Zhao

2018

Acta Astronautica

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Energy convergence of shock waves and its destruction mechanism in cone-roof combustion chambers

Cited by 14 publications

References 22 publications

Laser-induced cavitation bubbles and shock waves in water near a concave surface

Laser-induced cavitation bubbles and shock waves in water near a concave surface

Investigation into the Relationship between Super-Knock and Misfires in an SI GDI Engine

Investigate the shock focusing under a single vortex disturbance using 2D Saint-Venant equations with a shock-capturing scheme

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