Impact of Simulated Biogas Compositions (CH4 and CO2) on Vibration, Sound Pressure and Performance of a Spark Ignition Engine

Abstract

Biogas has increasingly been used as an alternative to fossil fuels in the world due to a number of factors, including the availability of raw materials, extensive resources, relatively cheap production and sufficient energy efficiency in internal combustion engines. Tightening environmental and renewable energy requirements create excellent prospects for biogas (BG) as a fuel. A study was conducted on a 1.6-L spark ignition (SI) engine (HR16DE), testing simulated biogas with different methane and carbon dioxide contents (100CH4, 80CH4_20CO2, 60CH4_40CO2, and 50CH4_50CO2) as fuel. The rate of heat release (ROHR) was calculated for each fuel. Vibration acceleration time, sound pressure and spectrum characteristics were also analyzed. The results of the study revealed which vibration of the engine correlates with combustion intensity, which is directly related to the main measure of engine energy efficiency—break thermal efficiency (BTE). Increasing vibrations have a negative correlation with carbon monoxide (CO) and hydrocarbon (HC) emissions, but a positive correlation with nitrogen oxide (NOx) emissions. Sound pressure also relates to the combustion process, but, in contrast to vibration, had a negative correlation with BTE and NOx, and a positive correlation with emissions of incomplete combustion products (CO, HC).

Biodujomis veikiančio kibirkštinio uždegimo variklio ekologinių ir energinių rodiklių gerinimas

“…Disertacijos tema atspausdinti devyni moksliniai straipsniai: trys -mokslo žurnaluose, įtrauktuose į Clarivate Analytics Web of Science duomenų bazę su citavimo rodikliu (Pukalskas et al, 2021, Kriaučiūnas et al, 2021a, vienas -Clarivate Analytics Web of Science duomenų bazės "Conference Proceedings" leidiniuose (Kriaučiūnas et al, 2018), du -kitų tarptautinių duomenų bazių leidiniuose (Ragauskas et al, 2019, Mieliauskas et al, 2018, tryskituose recenzuojamuose mokslo leidiniuose (Kriaučiūnas & Stravinskas, 2020. Disertacijoje atliktų tyrimų rezultatai paskelbti dviejose tarptautinėse mokslinėse konferencijose Lietuvoje ir užsienyje:…”

“…Nine scientific articles were published on the dissertation topic: three in scientific journals included in the Clarivate Analytics Web of Science database with IF (Pukalskas et al, 2021;Kriaučiūnas et al, 2021;Kriaučiūnas et al, 2021a), one publication in the Clarivate Analytics Web of Science database "Conference Proceedings" (Kriaučiūnas et al, 2018), two publications in other international databases (Ragauskas et al, 2019;Mieliauskas et al, 2018), three in other reviewed scientific journals (Kriaučiūnas, Stravinskas, 2020;Kriaučiūnas et al, 2019;Rimkus et al, 2018). Two reports on the dissertation topic were presented at conferences in Lithuania and Slovakia:…”