This paper proposed a novel turbo-compounding system by eliminating the turbocharger of the baseline series turbo-compounding from the system so that the power turbine became the only heat recovery device on the exhaust side of the engine, and operated at a higher expansion ratio. The compressor was separated from the turbine shaft and mechanically connected to the engine via CVT. According to the results, the backpressure of the novel system is significantly reduced comparing with the series turbo-compounding model. The power output at lower engine speed was also promoted. Besides, a novel arrangement which is known as the inverted Brayton cyclethe exhaust was also studied and compared with turbo-compounding in this paper for the higher potential of recovering energy from the exhaust gas. This paper analysed and optimized the parameters (including CVT ratio, turbine and compressor speed and the inlet pressure to the bottoming cycle) that are sensitive to the performance of the small vehicle engine equipped with inverted Brayton cycle and novel turbo-compounding system respectively. The performance evaluation was given in terms of brake power output and specific fuel consumption. Two working conditions, full and partial load (10 and 2 bar BMEP) were investigated. Evaluation of the transient performance was also carried out. Simulation results of these two designs were compared with each other as well as the performance from the corresponding baseline models.
ANALYSIS AND COMPARISON OF THE PERFORMANCE OF AN INVERTED BRAYTON CYCLE AND TURBO-COMPOUNDING WITH DECOUPLED TURBINE AND CVT DRIVEN COMPRESSOR FOR SMALL AUTOMOTIVE ENGINES
2016
Aufsatz (Zeitschrift)
Englisch
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