Gas exchange tuning in a single-cylinder research engine model

Examensarbete för masterexamen

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Type: Examensarbete för masterexamen
Title: Gas exchange tuning in a single-cylinder research engine model
Authors: Edholm, Oskar
Tagesson, Filip
Abstract: The development of new engines is a complex, multi-year endeavor and the process is lined with numerous steps of testing and verification. One of these steps is the use of single-cylinder research engines, which are used to limit variables and enable fast changes of components, methods and strategies when in the early stages of engine development. When the single-cylinder testing is done, the concepts from the single-cylinder are applied in the multi-cylinder engine, this introduces errors, as the pressure dynamics in the intake and exhaust are different in the two engine types due to the number of cylinders and manifold structures. To lessen the impact of this disparity the pressure dynamics in the single-cylinder engine should operate more like the multi-cylinder engine it is trying to replicate. In this report a GT-Suite model of a single-cylinder engine is created, optimized and ver ified to closely replicate an existing research engine. The pressure pulses in the intake and exhaust manifold are measured and compared to the ones of a multi-cylinder engine that the single-cylinder is replicating. Thereafter, concepts to modify the pressure pulses are introduced, modelled and tested. The concepts are optimized to modify the pressure pulses in a way that makes them match the multi-cylinder pulses as close as possible. Lastly the effect of altering the cylinder volume of the single-cylinder engine model is assessed. All proposed designs showed improvement towards replicating the multi-cylinder pressure dynamics and both intake and exhaust utilize the same concept topologically but vastly different in dimensions. This is not unexpected as the pressures on the intake and exhaust behave very differently. This result was verified for multiple engine operating conditions and showed beneficial in all cases. If the cylinder volume of the engine is altered but all else in kept identical only very minor changes in pressures are observed when compared to the original cylinder volume engine. This is also true when applying the suggested topology modification.
Keywords: Gas exchange, Engine modelling, Optimization, GT-Power, Simulation, Single-cylinder research engine, Multi-cylinder engine
Issue Date: 2021
Publisher: Chalmers tekniska högskola / Institutionen för mekanik och maritima vetenskaper
Collection:Examensarbeten för masterexamen // Master Theses

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