Proper orthogonal decomposition for energy convergence of shock waves under severe knock

Han Xu, Anren Yao, Chunde Yao and Jian Gao

Energy, 2017, vol. 128, issue C, 813-829

Abstract: Under severe knocks of internal combustion engines, parts like pistons and spark plugs are vulnerable to be damaged by energy convergence of shock waves. Furthermore, the damaged positions and failure modes have a significant regularity. In order to reveal the mechanism and avoid such damage, numerical simulations combined with detonation bomb experiments were conducted to explore the energy convergence phenomenon. Proper orthogonal decomposition was developed to extract the main pressure distributions so that the positions where energy converges can be found and the convergence modes can be recognized. Results show that energy convergence could occur in combustion chambers when severe knocks occurred. The spark plug, central region and edge region of a piston are in typical positions where energy converges. In addition, the position and intensity of such convergence are varied with the chamber shapes. The damaged samples further prove that the engine parts failure is caused by the energy convergence of shock waves. It's shown that the proper orthogonal decomposition is a simple and efficient method to identify the convergence modes and find the convergence positions. This research can provide a theoretical basis for the chamber design to avoid energy convergence as well as the destruction under severe knock.

Keywords: Proper orthogonal decomposition; Energy convergence; Shock wave focusing; Severe knock; Destruction (search for similar items in EconPapers)
Date: 2017
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (6)

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Persistent link: https://EconPapers.repec.org/RePEc:eee:energy:v:128:y:2017:i:c:p:813-829

DOI: 10.1016/j.energy.2017.04.019

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