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Figure 4.9 shows the error between the experimental results and simulated results. It was decided to see if the simulated turbine’s geometry in ”RIFT” corresponded to the tested turbine’s. Since the simulations used the total-to-total expansion ratio as an input variable, it was decided to compare the simulated mass flow with the mass flow measured in the test rig. They should be consistent with each other. This comparison can be viewed in figure 4.10 which show the mass flow versus total-to-total expansion ratio with different dimensionless shaft speed lines. +5% +15% Torque measured efficiency from experiments Figure 4.9.: The error from comparing the torque measured and simulated total- to-total efficiency. The fifteen and five percent error lines are shown. Respective minus five and minus fifteen can be imagined. 4.2.2. Summary Off-design performance of the second radial turbine has been simulated using ”RIFT”. The tests, performed by Volvo, where conducted in a cold rig. It could be seen, earlier, from the results from the simulations of the first radial turbine that best agreement where met when the simulated geometry and flow conditions resembled those which prevail during the tests. In light of this it was decided to simulate the performance of the second turbine in a similar manner. The results from the simulations can be seen in figures 4.9 and 4.10 which show the total-to-total efficiency and mass flow as a function of the total-to-total expansion ratio with different dimensionless shaft speed lines respectively. The total-to-total efficiency show good agreement except for small expansion ratio. However, since the efficiency was calculated using torque measurement (from the test results), this trend was rather 50 Simulated efficiency from RIFTPDF Image | A Detailed Analysis of Radial Turbines
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