Determination of optimum design parameters for uniform distribution of discharge air velocity of long fans

Date

1983

Abstract

Winnoring, a process in which impurities of the same size, lighter and/or heavier than the grain are removed, is one of the essential stages in the cleaning operation for grain. The capability of the fan to remove the impurities determined the ability of the fan to deliver the air velocity needed for cleaning, the volume of air required and most importantly, the quality of the air delivered to the material being cleaned. The quality of air for in-plant equipment wherein space and weight do not pose as much of a problem as for field equipment where portability, compactness and marginal power availability are big factors to be considered. Thus the study of the common fan used in the winnowing is undertaken. The common fan design currently being used in agricultural machineries particularly in the portable grain cleaners, and grain threshers are incapable of delivering good air quality for the cleaning operation of the grain. A sacrifice of the machine efficiency is needed to attain the quality of the grain output. Of the parameters affecting the uniformity of the air velocities (air quality) along the axial length of the fan, the intake diameter of the fan had the largest effect, the blade width, medium and blade pattern, least. A diameter of 8" (203.20 mm) for the GC6 fan and a completely tapered blade at 1.5" (38.10 mm) wide with a speed of 1089 rpm was advisable. The traverse or cross-flow effect could be used for centrifugal fan volute design using four-impellar, radial type blades with a relatively better air quality than a standard centrifugal fan.

Document Type

Master Thesis

Language

English

LC Subject

Fanning-milk

Location

UPLB Main Library Special Collections Section (USCS)

Call Number

LG 995 1983 A2 C323

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