Optimiranje zmogljivosti motorja za tekmovanje v seriji Formula Student

Verdev, Luka (author), Katrašnik, Tomaž (mentor)

V magistrski nalogi je predstavljena metodologija optimizacije zmogljivosti 3-valjnega motorja z notranjim zgorevanjem, ki se uporablja za tekmovanja Formula Študent. Na podlagi izvedenih meritev delovnih parametrov motorja v najpomembnejših delovnih točkah je predstavljen postopek in pomen validacije numeričnega modela motorja, ki predstavlja osnovo za določanje uspešnosti variacije geometrijskih parametrov sesalnega in izpušnega sistema. Na podlagi analiz rezultatov smo prišli do naslednjih glavnih ugotovitev: - Geometrija primarne sesalne cevi najbolj vpliva na učinkovitost izmenjave delovnega medija. - Na uspešnost izmenjave delovnega medija bolj vpliva geometrija sesalnega sistema kot geometrija izpušnega sistema. - Pri optimizaciji geometrije se da izboljšati karakteristiko moči motorja in hkrati povečati najvišjo moč motorja. - Restrikcija pretoka zraka drastično zmanjša volumetrični izkoristek valjev v območju vrtilnih frekvenc nad 10000 min-1.

• Language: Slovenian
• Keywords: Motorji z notranjim zgorevanjem Optimizacija zmogljivosti motorja Optimizacija geometrije sesalnega sistema Optimizacija geometrije izpušnega sistema Valovna dinamika Lastne akustične frekvence Helmholtz resonator Volumetrični izkoristek
• Work type: Master's thesis/paper
• Organization: FS - Faculty of Mechanical Engineering
• Year: 2018
• PID: 20.500.12556/RUL-99582
• Publication date in RUL: 06.02.2018

Secondary language

• Language: English
• Title: Engine performance optimization for Formula Student competition series

Abstract

In this thesis the methodology for performance optimization of a three cylinder internal combustion engine is presented. The engine is meant to be used in the Formula Student competition series. The optimization is based on numerical analysis of intake and exhaust system geometry variation. The numerical model of the whole engine is first validated with the data measured in the most relevant specific operating points, which presents the basis for estimating the improvement of engine performance due to variation of the intake and exhaust system geometry. Results reveal the following main conclusions: - The primary intake pipe geometry has the largest impact on the scavenging efficiency. - Whole intake system geometry generally has a greater influence on cylinder scavenging than the exhaust system geometry. - With geometry optimization, it is possible to improve the engine`s performance characteristics and increase the engine`s maximum power all in one. - Intake air restrictor drastically decreases volumetric efficiency of the cylinders at crankshaft speeds above 10000 min-1.

• Keywords: Internal combustion engines Engine performance optimization Intake system geometry optimization Exhaust system geometry optimization Wave dynamics Resonant acoustic frequency Volumetric efficiency Helmholtz resonator