Numerical and Experimental Tests of Separation in a Combine Cleaning Device

Abstract

In Chapter 5 the complexity of the process is increased. Tests in a 200 mm wide segment of a typical cleaning device are carried out numerically and experimentally. Based on the findings of Chapter 4, the material other than grain (MOG) is exchanged. The composition of the mixture and the shape of the DEM-MOG particles are reworked in order to fit the behavior of chopped straw. Additionally the variation of particle size as well as a model to implement particle moisture is introduced. A second parameter study is performed, taking mainly process parameters like MOG feedrate, MOG composition, intensity of mechanical and pneumatic stimulation etc. into account. A lab test rig is designed and manufactured in order to perform corresponding experimental tests. The results are compared based on process characteristic values like the grain loss, relative grain separation along chaffer (separation curve) and pressure drop over material layer.