Technical gazette, Vol. 25 No. 6, 2018.
Original scientific paper
https://doi.org/10.17559/TV-20160211230747
Application of VNT Turbocharger in Spark Ignition Engine with Additional Expansion of Exhaust Gases
Marcin Noga
orcid.org/0000-0002-3738-2220
; Cracow University of Technology, Institute of Automobiles and Internal Combustion Engines, Al. Jana Pawla II 37, 31-864 Krakow, Poland
Abstract
The paper provides an analysis of a VNT-type turbocharger implementation influence on operating parameters of the spark-ignition engine with additional expansion of exhaust gases. Previously, the research of the engine was performed with a charging system composed of a turbocharger with a simple waste-gate valve. The research was done mainly in order to improve the engine's performance for lower rotational speed range. The second reason of the described modification was to obtain lower fuel consumption. The four series of tests with boost pressure rising gradually from 0 to 0.8 bar were conducted for rotational speed of range 2000 - 3200 rpm. The described analysis of the obtained results showed that application of the VNT-type turbocharger caused significantly improved performances of the engine, especially in a lower rotational speed region. Also, decrease in the brake specific fuel consumption of the spark ignition engine with additional expansion of exhaust gases has been achieved for the rotational speed of value 2400 rpm.
Keywords
additional expansion of exhaust; efficiency; five-stroke spark ignition engine; turbocharger; variable nozzle turbine
Hrčak ID:
212807
URI
Publication date:
16.12.2018.
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