Parametarska analiza osnovnih veličina turboventilatorskog mlaznog motora

undergraduate thesis

• Title (english): Parametric analysis of the basic variables of a turbofan jet engine
• Author: Lara Klojčnik
• Mentor: Tessa Uroić (mentor)
• Granter: University of Zagreb; Faculty of Mechanical Engineering and Naval Architecture; Zagreb
• Defense date and country: 2025-02-25, Croatia
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Aviation, Rocket and Space Technology

Abstract

Najčešće korišteni motor u komercijalnom zrakoplovstvu je turboventilatorski mlazni motor
budući da predstavlja optimalni kompromis u pogledu ostvarivanja dovoljnog potiska uz
zadovoljavajuću iskoristivost motora, a što se postiže povećanjem masenog protoka
dodavanjem ventilatora. Veliku ulogu u dimenzioniranju motora i ostvarivanju željenih
performansi imaju dva omjera: omjer tlakova ventilatora (fan pressure ratio), fpr, koji određuje
brzinu mlaza i promjer motora uz zadani potisak i omjer sekundarne i primarne struje zraka,
tzv. bypass omjer, bpr. U okviru ovog rada opisane su konstrukcijske specifičnosti
turboventilatorskog motora naspram turbomlaznog motora, analiziran je utjecaj fpr-a na
termodinamičku učinkovitost turboventilatorskog motora, opisan je utjecaj omjera brzina
strujanja hladne struje na izlazu iz zaobilaznog voda i tople struje na izlazu iz mlaznice na
specifičnu potrošnju goriva i potisak te je provedena analiza utjecaja omjera primarnog i
sekundarnog zraka na potisak, njegovu iskoristivost i brzinu smjese primarnog i sekundarnog
zraka.

Abstract (english)

Most common used engine in commercial aircraft is the turbofan engine because it is the best
compromise in terms of achieving enough thrust with satisfactory efficiency of the engine what
is achieved by increasing mass flow by adding a fan. Huge part in engine sizing and achieving
desired performances have two ratios: fan pressure ratio, fpr, which determines jet velocity and
diameter of the engine for a given thrust and bypass ratio, bpr. Within the scope of this paper
design specifics of turbofan engine in opposition to turbojet engine are described, the impact of
fpr on thermodynamic efficiency of turbofan engine is analysed, the impact of the flow rate
ratio of the cold stream on the exit of the bypass duct and the warm stream at the nozzle outlet
on specific fuel consumption and thrust is analysed and the analysis of the impact of primary
and secondary air on thrust, its efficiency and velocity of the mixture of primary and secondary
air was carried out.

• Keywords: turboventilatorski motor; omjer tlakova ventilatora; bypass omjer; omjer brzina hladne i tople struje
• Keywords (english): turbofan engine; fan pressure ratio; bypass ratio; the ratio of the cold and warm stream velocities
• Language: croatian
• URN:NBN: urn:nbn:hr:235:160199
• Study programme: Title: Aeronautical Engineering; Study programme type: university; Study level: undergraduate; Academic / professional title: sveučilišni/a prvostupnik/ prvostupnica (baccalaureus/baccalaurea) inženjer/inženjerka zrakoplovnog inženjerstva (sveučilišni/a prvostupnik/ prvostupnica (baccalaureus/baccalaurea) inženjer/inženjerka zrakoplovnog inženjerstva)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Open access
• Created on: 2025-02-21 15:37:57