Effect of Compression Ratio on the Performance of a Constant Speed Spark Ignition Engine Operating on Raw Biogas

Abstract

In the present investigation, experiments were conducted in a 4.4 kW, single cylinder, water cooled, constant speed, spark ignition (SI) engine fuelled with raw biogas. The engine was operated at four different compression ratios (10.52, 11.94, 13.96 and 15.29) and within a load range of 6 to 77%. The effect of load level on the performance and emission characteristic of the engine at different compression ratios are analysed and presented in this paper. The brake power producing capability of the engine corresponds to CR 15.29 was maximum and found to be 2.93 kW with 76.27% of brake load. With increasing CR the engine becomes more stable and operates with an appreciable deviation in speed. Irrespective of engine loading condition, the minimum HC and CO emissions were noticed at CR 15.29 and found to very between 23-144 ppm and 0.016-0.091 %, respectively. The maximum NOx emission was detected at CR 15.29 and was found to very between 27-240 ppm.

Effect of vertical location of the spark plug on the performance of a raw biogas-fueled variable compression ratio spark ignition engine

“…It consists of approximately 50–70% of methane (CH 4 ), 25–50% of carbon dioxide (CO 2 ), 1–5% of hydrogen (H 2 ), 0.3–3% of nitrogen (N 2 ), and traces of other impurities, especially hydrogen sulfide (H 2 S). 5 With some modifications, it is possible to accomodate it in all types of IC engines using petroleum fuels. In such situation there are no major requirements of structural alterations of the engines, such as stroke length, bore diameter, clearance volume (CV), etc.…”

Biodujomis veikiančio kibirkštinio uždegimo variklio ekologinių ir energinių rodiklių gerinimas

“…NOx emisija padidėja apie tris kartus padidinus suslėgimo laipsnį nuo 10,5 iki 15,3. Anglies monoksido ir angliavandenilių emisija sumažėja apie tris kartus dėl efektyvesnio degimo proceso (Hotta et al, 2018) Biodujos pasižymi lėtu degimo greičiu ir mažu žemutiniu degalų šilumingumu, todėl bandoma rasti priedus, kurie leistų naudoti biodujas ir pagerinti variklio energinius parametrus (Hoseini et al, 2020;Soudagar et al, 2020). Atlikta tyrimų, kurių metu VDV, veikiančiam biodujomis, papildomai tiekiamos titano dioksido nanodalelės.…”