Vol.7, No 1, 2009 pp. 23 - 36
UDC 621.634
REVERSIBLE AXIAL FAN WITH BLADES CREATED OF SLIGHTLY DISTORTED PANEL PROFILES
Božidar Bogdanović, Jasmina Bogdanović-Jovanović, Živan Spasić, Saša Milanović
Faculty of Mechanical Engineering, A. Medvedeva 14, Niš, Serbia
E-mail: bozidar@masfak.ni.ac.rs
Abstract. Reversible axial fans consist of a fan runner only; they usually have runner blades, whose cylindrical cross-sections are panel-like or symmetrical lens-shaped profiles. There are also structures where runner blade's cylindrical cross-sections are slightly distorted panel profiles, but in engineering literature there is not a great deal of data about such profile cascades. Since the flow on cylindrical flow surfaces can be mapped into the flow through straight plane profile cascade, the basis for designing axial fans is given by the theory of fluid flow through straight plane profile cascades. Using the Fortran program for flow through straight plane profile cascades, developed at the Faculty of Mechanical Engineering in Niš, an analysis of the flow through profile cascades created of slightly distorted panel profile is carried out. The paper also includes the presentation of a procedure for designing this kind of profile cascades.
Key Words: Reversible, Axial Fan, Profiles, Profile Cascade.
REVERZIBILNI AKSIJALNI VENTILATOR SA LOPATICAMA FORMIRANIM OD BLAGO ZAKRIVLJENIH PLOČASTIH PROFILA
Reverzibilni aksijalni ventilatori konstruisani tako da imaju samo jedno ventilatorsko kolo, najčešće imaju lopatice čiji su cilindrični preseci pločasti ili simetrični sočivasti profili. Postoje konstrukcije i sa lopaticama čiji su cilindrični preseci blago izvijeni pločasti profili, o kojima se u stručnoj literaturi praktično i ne govori. Kako se strujanje na cilindričnim strujnim površinama može preslikati na strujanje kroz prave ravanske rešetke profila, osnovu, pri projektovanju aksijalnih ventilatora, daje teorija strujanja kroz prave ravanske rešetke profila. Koristeći, na Mašinskom fakultetu u Nišu, razvijeni program za proračun strujanja kroz prave profilne rešetke, izvršena je analiza strujanja kroz rešetke sa blago izvijenim pločastim profilima. U radu je izložen i postupak projektovanja rešetki sa blago izvijenim profilima.
Ključne reči: reverzibilni, aksijalni ventilatori, profili, rešetke profila