Computational Study to Improve Thermal Efficiency of Spark Ignition Engine

Ratnak Sok, Kohei Katori, Jin Kusaka, Yasuhiro Daisho, Kei Yoshimura, Nakama Kenjiro

Research output: Chapter in Book/Report/Conference proceedingConference contribution

3 Citations (Scopus)

Abstract

The objective of this paper is to investigate the potential of lean burn combustion to improve the thermal efficiency of spark ignition engine. Experiments used a single cylinder gasoline spark ignition engine fueled with primary reference fuel of octane number 90, running at 4000 revolution per minute and at wide open throttle. Experiments were conducted at constant fueling rate and in order to lean the mixture, more air is introduced by boosted pressure from stoichiometric mixture to lean limit while maintaining the high output engine torque as possible. Experimental results show that the highest thermal efficiency is obtained at excess air ratio of 1.3 combined with absolute boosted pressure of 117 kPa. Three dimensional computational fluid dynamic simulation with detailed chemical reactions was conducted and compared with results obtained from experiments as based points. The potential to improve further the efficiency, exhaust gas recirculation (EGR), high engine swirl ratio and high research octane number are good candidates for this improvement. In further calculations, we use simulated EGR ratio, high engine swirl ratio, RON95 fuels. To prevent the combustion from knock in the simulations when ignition timing is at maximum brake torque, simulated pressure probes are mounted on each side of intake and exhaust valves to detect knock pressure. By using these methods, spark timing of the engine can be advanced thus improve the thermal efficiency. It is found that, by combining lean-boosted/EGR and high octane-number fuel, higher thermal efficiency of spark ignition engine can be achieved.

Original languageEnglish
Title of host publicationSAE Technical Papers
PublisherSAE International
Volume2015-March
EditionMarch
DOIs
Publication statusPublished - 2015 Mar 10
Event18th Asia Pacific Automotive Engineering Conference, APAC 2015 - Melbourne, Australia
Duration: 2015 Mar 102015 Mar 12

Other

Other18th Asia Pacific Automotive Engineering Conference, APAC 2015
CountryAustralia
CityMelbourne
Period15/3/1015/3/12

Fingerprint

Internal combustion engines
Exhaust gas recirculation
Antiknock rating
Engines
Torque
Combustion knock
Fueling
Experiments
Engine cylinders
Air
Electric sparks
Brakes
Gasoline
Ignition
Chemical reactions
Computational fluid dynamics
Hot Temperature
Computer simulation

ASJC Scopus subject areas

  • Automotive Engineering
  • Safety, Risk, Reliability and Quality
  • Pollution
  • Industrial and Manufacturing Engineering

Cite this

Sok, R., Katori, K., Kusaka, J., Daisho, Y., Yoshimura, K., & Kenjiro, N. (2015). Computational Study to Improve Thermal Efficiency of Spark Ignition Engine. In SAE Technical Papers (March ed., Vol. 2015-March). SAE International. https://doi.org/10.4271/2015-01-0011

Computational Study to Improve Thermal Efficiency of Spark Ignition Engine. / Sok, Ratnak; Katori, Kohei; Kusaka, Jin; Daisho, Yasuhiro; Yoshimura, Kei; Kenjiro, Nakama.

SAE Technical Papers. Vol. 2015-March March. ed. SAE International, 2015.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Sok, R, Katori, K, Kusaka, J, Daisho, Y, Yoshimura, K & Kenjiro, N 2015, Computational Study to Improve Thermal Efficiency of Spark Ignition Engine. in SAE Technical Papers. March edn, vol. 2015-March, SAE International, 18th Asia Pacific Automotive Engineering Conference, APAC 2015, Melbourne, Australia, 15/3/10. https://doi.org/10.4271/2015-01-0011
Sok R, Katori K, Kusaka J, Daisho Y, Yoshimura K, Kenjiro N. Computational Study to Improve Thermal Efficiency of Spark Ignition Engine. In SAE Technical Papers. March ed. Vol. 2015-March. SAE International. 2015 https://doi.org/10.4271/2015-01-0011
Sok, Ratnak ; Katori, Kohei ; Kusaka, Jin ; Daisho, Yasuhiro ; Yoshimura, Kei ; Kenjiro, Nakama. / Computational Study to Improve Thermal Efficiency of Spark Ignition Engine. SAE Technical Papers. Vol. 2015-March March. ed. SAE International, 2015.
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