Scielo RSS <![CDATA[R&D Journal]]> http://www.scielo.org.za/rss.php?pid=2309-898820220001&lang=en vol. 38 num. lang. en <![CDATA[SciELO Logo]]> http://www.scielo.org.za/img/en/fbpelogp.gif http://www.scielo.org.za <![CDATA[<b>2021 R&D Journal Editorial Letter</b>]]> http://www.scielo.org.za/scielo.php?script=sci_arttext&pid=S2309-89882022000100001&lng=en&nrm=iso&tlng=en <![CDATA[<b>Pressure Recovery Discharge Configurations for an Induced Draught Axial Flow Fan</b>]]> http://www.scielo.org.za/scielo.php?script=sci_arttext&pid=S2309-89882022000100002&lng=en&nrm=iso&tlng=en This study investigates the potential gains in operating volume flow rate and static efficiency of an induced draught axial flow fan system. These gains are achieved through pressure recovery, i.e. the conversion of dynamic pressure at the fan exit into static pressure. Pressure recovery is achieved using downstream diffusers, stator blade rows, and combinations of these. Three different diffuser lengths are considered. Of the shortest diffusers, a conical diffuser increases the operating volume flow rate by 3.2 % and the fan static efficiency by 9.8 % (absolute). A longer conical diffuser increases it by 3.9 % and 11.9 %, respectively. Of the longest diffusers, an annular diffuser increases the flow rate by 5.5 % and the fan static efficiency by 16.8 %. <![CDATA[<b>Design of a Test Setup for Measuring all Load Components Acting on Tillage and Planting Implements</b>]]> http://www.scielo.org.za/scielo.php?script=sci_arttext&pid=S2309-89882022000100003&lng=en&nrm=iso&tlng=en This project entailed the design, manufacture, and testing of a test setup with the ability to measure all load components acting on tillage and planting implements. In future, data obtained with the test setup can be used to perform accurate design calculations, as input into finite element simulations, and to perform accurate fatigue analysis. The design of implements can therefore be improved to better withstand the loads under various operational conditions and to minimise fatigue cracking. Laboratory controlled testing, and subsequent field tests, proved that the designed test setup was able to isolate and accurately measure each of the three orthogonal load components, as well as the main moment. It was further shown that the remaining two moments could be accurately calculated using the measured load components and fixed geometric lengths. The conclusion was drawn, based on field tests, that an increase in speed with the tine ripper had no significant effect on the mean load. Further, an increase in the working depth, resulted in an increase in the load, especially in the draught and vertical directions. Finally, it was shown that a decrease in turning radius (a tighter turn), resulted in an increase in the lateral force component.