An Analysis of Mechanical and Thermal Stresses, Temperature and Displacement within the Transparent Cylinder and Piston Top of a Small Direct-Injection Spark-Ignition Optical Engine

Ravi Velugula, Balasubramanian Thiruvallur Loganathan, Lakshminarasimhan Varadhaiyengar, Ramesh Asvathanarayanan and Mayank Mittal ()
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Ravi Velugula: Indian Institute of Technology Madras, Chennai 600036, India
Balasubramanian Thiruvallur Loganathan: TVS Motor Co., Ltd., Hosur 635109, India
Lakshminarasimhan Varadhaiyengar: TVS Motor Co., Ltd., Hosur 635109, India
Ramesh Asvathanarayanan: Indian Institute of Technology Madras, Chennai 600036, India
Mayank Mittal: Indian Institute of Technology Madras, Chennai 600036, India

Energies, 2023, vol. 16, issue 21, 1-25

Abstract: Two- and three-wheeled vehicles account for a significant portion of the automobile market in several countries worldwide. In order to advance the capabilities of these vehicles, the integration of direct-injection (DI) technology is essential, given its potential benefits such as high thermal efficiency and low engine-out emissions. Direct injection in small-bore engines, however, further complicates the challenges involved (of DI technology) like fuel impingement and mixture inhomogeneity inside the engine cylinder, driving the need for an in-depth exploration of in-cylinder processes. Consequently, the necessity arises to develop a small-bore direct-injection spark-ignition (DISI) optical engine that incorporates a transparent cylinder and piston top. In this scenario, these transparent components are required to endure a combination of intricate loads and boundary conditions, hence the potential to result in failures. This work aims to assess numerically the effects of these loads and boundary conditions on the transparent components and optimize their thicknesses. For this purpose, a computer-aided design model of a small-bore DISI optical engine (displacement volume of 200 cm 3 ) is developed. The mechanical and thermal loads are extracted from the experimental data and validated computational fluid dynamics model of the same engine configuration. A coupled temperature-displacement finite element analysis methodology is developed in ABAQUS/CAE, and simulations are performed under both steady and transient conditions. Temperature and combined stress distributions within the transparent cylinder and piston top are obtained and analyzed to find their optimum thicknesses. Knowing thermal gradients, combined stresses and displacements under actual conditions helped design the small optical engine with an improved factor of safety.

Keywords: small-bore DISI optical engine; quartz cylinder; coupled finite element analysis; steady-state and transient analyses; temperature distributions; combined stress distributions (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2023
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