Performance Sensitivity to Exhaust Valves and Turbine Parameters on a Turbocompound Engine with Divided Exhaust Period
2014 (English)In: SAE International Journal of Engines, Vol. 7, no 4, 1722-1733 p.Article in journal (Refereed) Published
Turbocompound can utilize part of the exhaust energy on internal combustion engines; however, it increases exhaust back pressure, and pumping loss. To avoid such drawbacks, divided exhaust period (DEP) technology is combined with the turbocompound engine. In the DEP concept the exhaust flow is divided between two different exhaust manifolds, blowdown and scavenging, with different valve timings. This leads to lower exhaust back pressure and improves engine performance.
Combining turbocompound engine with DEP has been theoretically investigated previously and shown that this reduces the fuel consumption and there is a compromise between the turbine energy recovery and the pumping work in the engine optimization. However, the sensitivity of the engine performance has not been investigated for all relevant parameters. The main aim of this study is to analyze the sensitivity of this engine architecture in terms of break specific fuel consumption to different parameters concerning the gas exchange such as blowdown valve timing, scavenging valve timing, blowdown valve size, scavenging valve size, discharge coefficients of blowdown and scavenging ports, turbine efficiency, turbine size and power transmission efficiency. This study presents the sensitivity analysis of the turbocompound DEP engine to these parameters and defines a set of important parameters that should be examined in experimental studies.
Place, publisher, year, edition, pages
SAE , 2014. Vol. 7, no 4, 1722-1733 p.
Turbocomopund engine, divided exhaust period, sensitivity, exhaust valves, turbine
Vehicle Engineering Applied Mechanics Energy Engineering
Research subject Machine Design; Vehicle and Maritime Engineering; Energy Technology
IdentifiersURN: urn:nbn:se:kth:diva-149333OAI: oai:DiVA.org:kth-149333DiVA: diva2:739186
SAE 2014 International Powertrains, Fuels and Lubricants Meeting,October 20-23, 2014,Birmingham, United Kingdom
FunderSwedish Energy Agency
The paper is updated from Conference paper to Article in Journal. QC 201411182014-08-202014-08-202014-11-18Bibliographically approved