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CHAPTER 4: Manufacturing and Experimental Testing of the Developed Compressed Air RIT In other words, as the turbine rotational speed increases, the CFD simulations can capture the turbine behaviour more accurately compared to lower speeds. Referring to these figures not only confirms that, as the rotational speed increased both the turbine power and efficiency were also increased but also the performance prediction errors in such CFD simulations were reduced considerably. In addition, if the torque meter was capable of operating at higher rotational speeds then it was expected that the error in CFD predictions would be reduced further. Such results show that the developed CFD model can fairly accurately predict the performance of the radial turbine and the proposed modelling strategy can be used as a benchmarking model for developing small-scale RITs. 4.4. Summary and conclusions Following the proposed methodology in chapter three, it was required to manufacture the developed RIT stage and conduct the experiments to validate such methodology. The RIT was fabricated using additive layer manufacturing technique. The experimental facility was built and the turbine was instrumented in order to measure the turbine performance under a range of off-design operating conditions. The details of instruments calibration as well as uncertainty analyses were explained. Such results were used to calculate the propagated error into the measured power and efficiency. The experimental results 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 complete turbine assembly was validated with experiments for all the data points. Results showed that the CFD model can predict the turbine efficiency with the accuracy of ±16% while the turbine power was predicted with the accuracy of ±13%. The CFD model can predict the turbine performance with better accuracy at higher rotational speeds compared to lower speeds. It was expected that if the 152 | P a g ePDF Image | SMALL-SCALE RADIAL INFLOW TURBINE FOR WHR ORC
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