This paper presents the development approach, design, and evaluation of three turbocharger compressors with variable geometry for heavy duty engines. The main goal is the improvement of fuel economy without sacrifices regarding any other performance criteria. In a first step, a vaned diffuser parameter study shows that efficiency improvements in the relevant operating areas are possible at the cost of reduced map width. Concluding from the results, three variable geometries with varying complexity based on vaned diffusers are designed. Results from the hot gas test stand and engine test rig show that all systems are capable of increasing compressor efficiency and thus improving fuel economy in the main driving range of heavy duty engines. The most significant differences can be seen regarding the engine brake performance. Only one system meets all engine demands while improving fuel economy.
Variable Geometry Compressors for Heavy Duty Truck Engine Turbochargers
Contributed by the Vehicular and Small Turbomachines Committee of ASME for publication in the JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER. Manuscript received July 24, 2017; final manuscript received August 28, 2017; published online April 20, 2018. Editor: David Wisler.
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Wöhr, M., Müller, M., and Leweux, J. (April 20, 2018). "Variable Geometry Compressors for Heavy Duty Truck Engine Turbochargers." ASME. J. Eng. Gas Turbines Power. July 2018; 140(7): 072701. https://doi.org/10.1115/1.4038323
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