Increased demands for improved fuel economy of passenger cars raise the significance of low-end and part-load performance of automotive turbochargers. In an automotive drive cycle, systems most efficient at low rotational speeds and low blade speed ratios prove particularly advantageous. Notwithstanding the optimum fuel consumption requirement, system responsiveness may not be compromised. Consequently, turbine development faces a target conflict between best (part load) efficiency and minimum rotor inertia. IHI Charging Systems International (ICSI) has, for several years, been working on Mixed-flow Turbine technology, which allows tailor-made turbine solutions to optimally address this conflict. Appropriate compromising between turbine inertia and efficiency is thus possible, leading to best turbocharger and, therefore, engine performance. Whereas the relationship between component efficiency and achievable engine torque under steady-state conditions is obvious, best engine performance under transient load requires deeper investigation. Different transient engine load cases are investigated to illustrate the relationship between inertia and efficiency. This compromise can vary significantly, depending on what engine requirement is the customer focus. Several design parameters are discussed and their influence on transient engine performance is presented. A state-of-the-art turbocharged SI engine with conventional single-stage turbocharging is modeled for engine simulation with ITES (IHI Turbocharged Engine Simulation), ICSI's multipurpose, in-house OD simulation tool, which offers extraordinary modeling flexibility at minimum computational expense.
Tailor-Made Mixed Flow Turbocharger Turbines for best Steady-State and Transient Engine Performance
2013
19 Seiten, Bilder, Tabellen, 20 Quellen
Conference paper
English
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