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Keskmootoriga ralliauto Tauria restaureerimine - sisselasketrakt

Romanenkov, Karl (2017) Keskmootoriga ralliauto Tauria restaureerimine - sisselasketrakt. [thesis] [en] Restoration of a Mid Engined Rally Car Tauria - Intake System.

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Abstract

Töö käigus projekteeriti uus sisselasketrakt, mis arvestab vaadeldava mootori ja auto eripärasid. Uus sisselasketrakt on oma põhimõttelt jäänud sama nagu algsel lahendusel, kasutusel on individuaalsed drosselid (karburaatori lõõrid) igale silindrile, kuid muutunud on selle parameetrid: pikkus, läbimõõt ja kuju. Enam ei ole kasutusel horisontaalkarburaatorid, vaid torustik keerab ruumi puuduse tõttu 90 kraadi ning eelnevaid asendavad uued vertikaalkarburaatorid Weber IDF 40. Tänu sisselasketraktis tekkivatele rõhulainetele on võimalik rohkem õhku silindrisse mahutada kui sinna normaalrõhul mahuks. Sisselasketraktis tekivad rõhulained kuna õhk ei liigu seal ühtlase joana edasi, vaid pulseerib edasi-tagasi tänu sisselaskeklapi avanemisele ja sulgumisele. Töö alguses seati eesmärk saavutada täiteastet 105%, teoreetiliselt jõuti sellele ka lähedale, Lotus Engine Simulation programmi kasutades saadi parimaks tulemuseks täiteaste 104,2% sisselasketrakti pikkusega 620 mm. Antud töös osutus siiski valituks sisselaske trakt pikkusega 530 mm, mis pakkus küll veidi vähemat ülelaade efekti, kuid andis parima võimsuse näitaja (90,29 kW), ning parima ühtlase jõudluse suurtel mootoripööretel. Eelnevalt leitud pikkuse põhjal projekteeriti ja valmistati antud olukorda sobiv sisselaskekollektor ja trompetid. Sisselaskekollektori materjaliks valiti teras, kuna see on kõige lihtsamini töödeldav, odav ja sobiv antud keskkonda. Trompetid valmistati 3D printimise tehnoloogia abil, kuna nõutud tingimustele vastavaid trompeteid ostutoodete seast ei leitud. Töö käigus sai Tauria omale uue sisselasketrakti, kuid selle mõju võimsusele hinnati ainult teoreetiliselt, sest puudus võimalus dünostendi külastamiseks, kuna töö tegemise hetkel ei olnud auto veel piisavalt komplektne dünostendi viimiseks. Mootori edasiseks võimsuse arendamiseks oleks vaja auto võimsust mõõta reaalselt dünostendis ning teha siis sealt järeldused, milline komponent või parameeter vajaks tulevikus tähelepanu.

Abstract [en]

During the work of this paper, “Restoration of a Mid Engined Rally Car Tauria - Intake System”, a new inlet tract that takes into account the traits of the observable engine and car was engineered. The new inlet tract has, based on its principle, stayed the same as in the original solution, individual throttles (carburettor pipes) are used on every cylinder, but the parameters (length, diameter and shape) have changed. Horizontal carburettors are not used anymore, instead the piping turns 90 degrees because of room deficiency and previous ones are replaced by new vertical carburettors Weber IDF 40. Thanks to the pressure waves in the inlet tract, it is possible to fit more air into a cylinder than it would be possible at normal pressure. Pressure waves appear in the inlet tract because air does not move forward as even spurts in there, instead it pulses back and forth thanks to the opening and closing of the inlet valve. The original aim of this paper was to achieve a volumetric efficiency of 105%. Theoretically, it was almost reached using the Lotus Engine Simulation program, volumetric efficiency of 104,2%, when the length of the inlet tract was 620 mm, was achieved as the best result. In this paper, inlet tract with the length of 530 mm was chosen, because it offered a little less of the supercharge effect, but provided the best power (90,29 kW) and even performance at high engine speed. Based on the previously found length, inlet collector and trumpets best fit for this situation where engineered and built. Steel was chosen as the material for the inlet collector, because it is the easiest to process, it is cheap and fit for the given environment. The trumpets were made by using 3D printing technology, because no buyable trumpets were found that would satisfy the requirements. During the work Tauria got a new inlet tract, but its effect on power was only evaluated theoretically. There was not a possibility to visit a dyno stand, because at that time the car was not ready for that yet. For future improvement of the power of the engine, it is necessary to measure the power of the car in dyno stand and then make conclusions about which component or parameter needs more attention based on that.

Item Type: thesis
Advisor: Aimar Lukk
Subjects: Transport > Automotive engineering > Fundamentals of motor vehicle design
Divisions: Faculty of Transport (until 2017) > Automotive Engineering
Depositing User: Karl Romanenkov
Date Deposited: 07 Jun 2017 06:36
Last Modified: 07 Jun 2017 11:18
URI: http://eprints.tktk.ee/id/eprint/2722

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