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CHAPTER 7: Conclusions and Recommendations for Future Work output was mostly affected by Tt,1, 𝑚̇ , ERts, ν and α4 and the turbine rotor inlet diameter was only affected by Tt,1, ERts, ν and ω. The results of such parametric studies were substantially useful for selecting the best values for the turbine input parameters that led to high performance. Although effective, mean-line modelling couldn’t capture the complete behaviour of the flow within the RIT blade passages due to the three-dimensional and complex nature of such flow. Therefore, CFD analysis was used to investigate in greater details the candidate RIT configuration suggested by the mean-line model. CFD analyses showed that a more realistic and efficient turbine design can be achieved by subtle variation of the blade geometry in terms of the blade angle and thickness distributions, shape of leading edge and the number of rotor blades while assessing both quantitative (efficiency and power) and qualitative (velocity vectors, secondary flows, entropy contours and blade loading) CFD results. Such CFD analyses proved to be effective as the compressed air RIT isentropic efficiency was increased from 81.3% obtained from the mean-line modelling to 84.5% obtained by the CFD. Experimental testing of the compressed air RIT showed that the turbine efficiency was more sensitive to the turbine rotational speed while the turbine power was sensitive to both expansion ratio and rotational speed. The CFD model of the turbine stage was validated with the experiments. Results showed that the CFD model can predict the turbine efficiency with accuracy of ±16% while the turbine power was predicted with accuracy of ±13%. The CFD model could predict the turbine performance with better accuracy at higher rotational speeds compared to lower speeds. It was expected that if the fabricated experimental facility was capable of running at higher rotational speeds the error could even decrease further. The results 267 | P a g ePDF Image | SMALL-SCALE RADIAL INFLOW TURBINE FOR WHR ORC
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