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SMALL-SCALE RADIAL INFLOW TURBINE FOR WHR ORC

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SMALL-SCALE RADIAL INFLOW TURBINE FOR WHR ORC ( small-scale-radial-inflow-turbine-for-whr-orc )

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CHAPTER 4: Manufacturing and Experimental Testing of the Developed Compressed Air RIT Brayton cycle configuration (Lemofouet et al. 2006). Therefore, developing efficient compressed air turbines such as the one in chapter three is vital for CAES application and RIT can play an important role in increasing the efficiency of this energy conversion process. Recalling the turbine development methodology proposed in chapter three (refer to Figure 3-3), it is the last two steps that remained and needs to be completed. Thus, in this chapter the CAD modelling, manufacturing technique and experimental testing of the RIT developed in chapter three will be described in details together with the explanation of the instrumentation, calibration and uncertainty analysis. Moreover, the accuracy of the CFD model will be assessed by comparing the experimental results with the corresponding CFD values and eventually the effectiveness of the proposed approach will be highlighted. 4.2. 3-D CAD solid modelling and manufacturing 4.2.1. CAD modelling The nozzle ring and rotor wheel (Figure 3-38) together with the complementary components such as casing (Figure 3-39), shaft and bearing housing were imported into the SolidWorks CAD package to include the fillets at the rotor blade root as well as accommodating the bearings, retaining rings, O-rings and grooves within the casing. The casing itself was designed in two pieces in order to ease its manufacturing. Hybrid ceramic ball bearing with two rubber seals was selected to allow for high rotational speed as well as for sealing requirements. O-rings and their grooves were accommodated between any two flanges for the purpose of appropriate sealing. Moreover, in the light of earlier FEA of the complete turbine assembly (Figure 4-1) the thickness of casing was specified together with the inclusion of stiffening ribs to ensure the mechanical integrity of casing under the operating pressure. The complete turbine assembly is presented in 122 | P a g e

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