Numerical investigation of combustion and intake valve timing on the performance of TU5 spark ignition engine

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Azarkhazin Javad; Aliakbari Karim; Sheykhi Mohammad; Delavari Seyyed Mohammad Mahdi

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Journal Paper

Paper Information

Journal: JOURNAL OF SOLID AND FLUID MECHANICS Year:2025 | Volume:14 | Issue:6 Page(s): 19-32

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Title

Numerical investigation of combustion and intake valve timing on the performance of TU5 spark ignition engine

Author(s)

Azarkhazin Javad | Aliakbari Karim | Sheykhi Mohammad | Delavari Seyyed Mohammad Mahdi | Issue Writer Certificate

Keywords

TU5 engine

Spark timing

Intake valve timing

Special fuel consumption

Optimal advance

Abstract

Spark and intake valve timings are key operating parameters of spark ignition engines that determine the initial combustion process and the intake air amount during engine operation. Therefore, determining the appropriate timing for spark initiation and breathing are important factors for improving engine performance and complete combustion. The present work aims to evaluate the effects of spark and intake valve timings and the appropriate selection of compression ratio at different speeds on the TU5 engine performance using a numerical method. To achieve this goal, first, numerical simulation results are compared with experimental results and validated, then the effects of engine technical parameters, including compression ratio, combustion and intake valve timings at different speeds on characteristics of power, torque, average combustion pressure, volumetric efficiency, thermal efficiency, and specific fuel consumption are investigated. The results showed that engine output characteristics at 4000 rpm have the best performance. Also, the optimal advance for maximizing power and torque and the lowest specific fuel consumption is 5 and 10 degrees before the top dead center at 2000 and 4000 rpm, respectively. In addition, by selecting the intake valve advance angle at about 30 degrees before the intake process, volumetric efficiency will reach about 97 percent.

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