Brennstoffzellensysteme im Straßenverkehr als Antriebskonzept für die Mobilität der Zukunft

Menze, Marco; Schödel, Markus; Willers, Ole; Seume, Jörg

doi:10.34647/jmv.nr3.id24

Cited by 1 publication

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“…The investigations of this paper are part of the research project ARIEL (German short form for: Charging of Fuel Cell Systems through Interdisciplinary Developed Electrically Driven Air Compressors) which aimes to optimize an existing electrically driven turbocharger (baseline design) for the cathode air supply of an automotive fuel cell [16]. Firstly, this paper numerically investigates the influence of the diffuser height as a compressor design parameter on the compressor map and efficiency.…”

Section: Introductionmentioning

confidence: 99%

Experimentally Validated Extension of the Operating Range of an Electrically Driven Turbocharger for Fuel Cell Applications

2021

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From an aerodynamic point of view, the electric turbocharger for the air supply of an automotive fuel cell faces difficult requirements: it must not only control the pressure level of the fuel cell, but it also has to operate with very high efficiency over a wide range. This paper explores features for the compressor and the turbine of an existing electric turbocharger, which are intended to meet the specific requirements of a fuel cell in an experimentally validated numerical study. Adjustable diffuser or nozzle vanes in the compressor and turbine achieve wider operating ranges but compromise efficiency, especially because of the necessary gaps between vanes and end walls. For the turbine, there are additional efficiency losses since the pivoting of the nozzle vanes leads to incidence and thus to flow separation at the leading edge of the nozzle vanes and the rotor blades. An increase in the mass flow and a slight efficiency improvement of the turbine with the low solidity nozzle vanes counteracts these losses. For the compressor, a reduction in the diffuser height and its influence over the operating range and power consumption yields an increase in surge margin as well as in maximum efficiency.

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Section: Introductionmentioning

confidence: 99%