JOURNAL OF THE FACULTY OF ENGINEERING AND ARCHITECTURE OF GAZI UNIVERSITY, cilt.32, ss.1051-1061, 2017 (SCI İndekslerine Giren Dergi)
The aim of this study is to evaluate the effect of nozzle geometry on erosive wear behavior of polymethyl methacrylate (PMMA). One of the most important factors that effects the abrasive particles velocity and damage occurrence in the target material is the internal geometry of the blasting nozzles. Various types of nozzle geometries are used in industry such as abrasive jet micro-machining and sandblasting. Abrasive blasting is a traditional method of abrasive machining process and has a widespread usage area such as micro-machining, surface treatment, surface cleaning. The main purpose of this method is to accelerate the abrasive particles by using a high pressure carrier gas through the nozzle and impacting them to the surface of the target material. Whilst the maximum erosion rate was observed in nozzle with a diameter of 5 mm in entrance and exit with throat of 4 mm in mid-point, minimum erosion rate occurred in nozzle with 3 mm entrance diameter and 2 mm exit diameter. The maximum and minimum effect area surfaces were observed with the same nozzle geometries. Maximum average surface roughness value measured in samples blasted with constant cross-section 3mm diameter nozzles whilst the average roughness was observed in nozzle with a diameter of 5 mm in entrance and exit with throat of 3 mm in mid-point. was increased, the lift force was decreased. Thrust force of airfoils made of nylon sheet and latex airfoils are better than those of wood airfoils is found.