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B. Kareem et al. DOI: 10.4236/jpee.2018.611009 and pitch of 20 mm were used. Figure 4 illustrates design of the nozzle geometry of the micro-turbine. In the presence of mean blade path diameter, Dm, (0.3), blade spacing (pitch), s (0.02), the number of blades Nb was determined using Equation (5) as 94. The shaft diameter was determined to be 19.74 mm (25 mm) for mild steel using Equation (6) [15], given that torque, T transmitted by the shaft is in 81.58 Nm, yield stress for mild steel do is 200 N/mm2 and π, 3.142 is a constant Nb =2πDm (5) s d3= 16T (6) 0.27πdo Performance (reliability) evaluation of the design was carried out using mod- elling and simulation technique via Solidworks and Comsol Multiphysics ana- lytical software. In the micro turbine design, the analyses covered the blade, shaft and nozzle design. In blade design parameters, stress failures, efficiency were analyzed. In casing volume design, the overall heat transfer in the volume and mean temperature difference concepts were evaluated. The thermally induced stresses in a turbine stator blade are analyzed to determine tolerance and relia- bility level. 2.3. Material Selection The selection of materials for different parts of the turbine depends on the strength or tension/compression the component can withstand, heat transfer coefficient and thermal resistivity makes sure that the total weight must be mi- nimal. In selecting materials, high consideration was given to lightweight mate- rials that can withstand stress and strain of that particular component compared to heavy or bulky materials. After thorough analysis, the materials chosen with estimated cost for the components and their proposed fabrication methods are given in Table 2 and Table 3, respectively. Figure 4. Design of Nozzle geometry. 117 Journal of Power and Energy EngineeringPDF Image | Design of Steam Turbine for Electric Power Production Using Heat Energy from Palm Kernel Shell
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