Abstract
Current commercial and heavy-duty powertrains are geared towards emissions reduction. Energy recovery from exhaust gases has great potential, considering the mechanical work to be transferred back to the engine. For this purpose, an additional turbine can be implemented behind a turbocharger; this solution is called turbocompounding (TC). This paper considers the adaptation of turbine wheels and gearboxes of small turboshaft and turbojet engines into a two-stage TC system for a six-cylinder opposed-piston engine that is currently under development. The initial conditions are presented in the first section, while a comparison between small turboshaft and turbojet engines and their components for TC is presented in the second section. Based on the comparative study, a total number of 7 turbojet and 8 turboshaft engines were considered for the TC unit.
Highlights
High-temperature exhaust gases from internal combustion engines (ICE) offer the potential for heat recovery systems
Mechanical turbocompounding or electric turbocompounding systems have been used in heavy-duty diesel (HDD) engines
A 2-stage mechanical TC system will be implemented in the 6-cylinder opposed-piston engine that is under development at Warsaw University of Technology
Summary
High-temperature exhaust gases from internal combustion engines (ICE) offer the potential for heat recovery systems. The first configuration showed good results for the engine at low loads, at high loads the advantages were minor compared to the fixed geometry turbine Both systems displayed potential for power recovery of about 2% ÷ 2.5%. In low-speed, high-load conditions, the post-catalyst turbine position proved to be the best, with a reduction in the BSFC of 2.38% and an increase in the brake mean effective pressure (BMEP) of 2.4%. The higher mass of the ICE was compensated by the lower fuel consumption compared to the turboshaft engine He and Xie [9] investigated three modes of TC, namely electric TC, series TC, and parallel TC, on a 6-cylinder HDD engine. The recovered waste heat will be returned to the crankshaft by means of the gearbox
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