master's thesis
SPEED AND FLOW OF AIR CURRENTS IN DIFFERENT TYPES OF DISPENSERS

Josip Grigić (2014)
Sveučilište Josipa Jurja Strossmayera u Osijeku
Poljoprivredni fakultet
Zavod za Mehanizaciju
Metadata
TitleBRZINA I PROTOK ZRAČNE STRUJE KOD RAZLIČITIH TIPOVA RASPRŠIVAČA
AuthorJosip Grigić
Mentor(s)Vjekoslav Tadić (thesis advisor)
Abstract
Cilj istraživanja bio je utvrditi vertikalnu raspodjelu brzine zraka pri radu aksijalnog i radijalnog raspršivača s obzirom na dvije razine protoka zraka. Pri radu aksijalnog raspršivača koristi se protok zraka od 10995,75 i 14154,75 m3/h, a pri radu radijalnog raspršivača koristi se protok od 6248,33 i 10265,16 m3/h. Aksijalni raspršivač ostvaruje veće protoke zraka uz manje brzine, dok radijalni raspršivač ostvaruje veće brzine zraka uz manji protok. Vertikalna distribucija brzine zraka ravnomjernija je pri radu radijalnog raspršivača s relativno malom devijacijom i koeficijentom varijacije za razliku od aksijalnog koji ima veća odstupanja (aksijalni raspršivač, vinograd: desna strana stroja s KV od 31,30% te lijeva s 31,04%, nasad jabuke: desna strana stroja s KV od 27,20% te lijeva s 26,68%; radijalni raspršivač, vinograd: desna strana stroja s KV od 2,18% te lijeva s 3,81%, nasad jabuka: desna strana stroja s KV od 5,61% te lijeva s 10,51%). Također se utvrđuje da pri radu aksijalnog raspršivača, lijeva strana stroja ostvaruje znatno veće brzine zraka (u vinogradu: lijeva strana stroja s prosječnom brzinom od 14,96 m/s te desna sa 11,21 m/s; u nasadu jabuke: lijeva strana stroja sa prosječnom brzinom od 19,38 m/s te desna s 15,58 m/s), za razliku od radijalnog raspršivača gdje su razlike minimalne i usmjerene na desnu stranu (u vinogradu: lijeva strana stroja s prosječnom brzinom od 14,95 m/s te desna sa 16,25 m/s; u nasadu jabuke: lijeva strana stroja s prosječnom brzinom od 24,45 m/s te desna sa 26,00 m/s). Zbog gibanja zraka od usmjerivača, dolazi do pojave miješanja i trenja sa okolnim zrakom pa brzina slabi, te se veće smanjenje utvrđuje pri radu radijalnog raspršivača (aksijalni raspršivač, u vinogradu: desna strana stroja sa smanjenjem od 35,10% te lijeva s 32,55%, u nasadu januke: desna strana stroja sa smanjenjem od 44,58% te lijeva s 37,61%; radijalni raspršivač, u vinogradu: desna strana stroja sa smanjenjem od 55,69% te lijeva s 55,11%, u nasadu jabuke: desna strana stroja sa smanjenjem od 45,97% te lijeva s 46,42%). Radijalni raspršivač ostvaruje ujednačenije rezultate vertikalne raspodjele brzine zraka, za razliku od aksijalnog, te se sa savitljivo prilagodljivim vodovima lako prilagođava različitim uzgojnim oblicima trajnih nasada.
Keywordsaxial mistblower radial mistblower air velocity air flow fan
Parallel title (English)SPEED AND FLOW OF AIR CURRENTS IN DIFFERENT TYPES OF DISPENSERS
Committee MembersĐuro Banaj
Ivan Plaščak
GranterSveučilište Josipa Jurja Strossmayera u Osijeku
Poljoprivredni fakultet
Lower level organizational unitsZavod za Mehanizaciju
PlaceOsijek
StateCroatia
Scientific field, discipline, subdisciplineBIOTECHNICAL SCIENCES
Agronomy
Agricultural Engineering and Technology
Study programme typeuniversity
Study levelgraduate
Study programmeMechanization
Academic title abbreviationmag. ing. agr.
Genremaster's thesis
Language Croatian
Defense date2014-09-22
Parallel abstract (English)
The objective of this study was to determine the vertical air flow velocity considering two different air flows on the axial and radial mistblower. With axial mistblower the air flow of 10995.75 and 14154.75 m3/h is used, and with radial mistblower the air flow of 6248.33 and 10265.16 m3/h. Axial mistblower achieves greater air flow with minor velocity, while radial mistblower achieves greater velocities with minor air flow. Vertical distribution of air flow velocity is more balanced with the exploitation of radial mistblower with relative by small deviation and coefficient of variation, unlike the axial mistblower which achieves greater deviations (axial mistblower, first adjustment: the right side of the machine with CV of 31.30% and the left with 31.04%, second adjustment: the right side of the machine with CV of 27.20% and the left with CV of 26.68%; radial mistblower, first adjustment: the right side of the machine with CV of 2.18% and the left with CV of 3.81%; second adjustment: the right side of the machine with CV of 5.61% and the left with CV of 10.51%). The left side of axial mistblower achieves significantly higher air velocity (first adjustment: the left side of the machine with average speed of 14.96 m/s and the right with 11.21 m/s; second adjustment: the left side of the machine with average speed of 19.38 m/s and the right with 15.58 m/s), unlike the radial mistblower, where the differences are minimal and focused on the right side (first adjustment: the left side of the machine with average speed of 14.95 m/s and the right with 16.25 m/s; second adjustment: the left side of the machine with average speed of 24.45 m/s and the right with 26.00 m/s). Owing to the air flow movement, mixing and friction occur with the surrounding air, so air flow velocitydecreases (greater decrease with the exploitation of radial mistblower) – axial mistblower, first adjustment: the right side of the machine with the decreae of 35.10% and the left with 32.55%, second adjustment: the right side of the machine with the decrease of 44.58% and the left with 37.61%; radial mistblower, first adjustment: the right side of the machine with the decrease of 55.69% and the left with 55.11%, second adjustment: the right side of the machine with decreasing of 45.97% and the left with 46.42%). Radial mistblower achieves uniformly results of vertical air flow velocity distribution, and with flexible adaptable conduits, it can easily adapt to different breeding forms of permanent crops.
Parallel keywords (Croatian)aksijalni raspršivač radijalni raspršivač brzina zraka protok zraka ventilator
Resource typetext
Access conditionOpen access
Terms of usehttp://rightsstatements.org/vocab/InC/1.0/
Notediplomski rad
URN:NBNhttps://urn.nsk.hr/urn:nbn:hr:151:603300
CommitterLjiljana Vučković Vizentaner