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incidence as possible. A surface roughness of 64 μm was used for all components. An axial clearance of 0.5 mm was used between the impeller and the disk. A radial clearance of 0.5 mm was used for the impeller. Table 4.1.: The simulations with the original radial turbine were attempting to re- semble the real inlet flow conditions. The mole fractions of the gas used in ”RIFT” are presented in this table. Carbon dioxide, CO2 0.12 Nitrogen, N2 0.55 Oxygen, O2 0.23 Water, H2O 0.10 In the performance analyses the inlet total temperature and the inlet total pressure were held constant. The rotational speed and the total-to-static expansion ratio were then altered to generate the performance maps. It was explained in chapter two that the expansion ratio and mass flow could not be specified at the same time. In the light of this it was decided to specify the expansion ratio and compare the mass flow to the mass flow from the experimental tests and thus see if they converged. The input variables are summarized in table 4.2. Table 4.2.: The simulations, on the original radial turbine, were performed with a constant inlet total temperature and pressure. The total-to-static ex- pansion ratio and shaft speed were altered. The mass flow was used as a convergence parameter. Inlet total temperature, T01 Inlet total pressure, p01 Expansion ratio, p01 /p9 Rotational speed, N Mass flow, m ̇ Hot High Varying Varying Calculated The efficiency were measured in two different ways. ηTT,m corresponds to torque mea- sured efficiency and ηTT,T corresponds to temperature measured efficiency. Which one that has best compliance is hard to determine. The error between the experimental results and simulation results is demonstrated in figures 4.2 and 4.3. 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-static 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 4.4 which shows the mass flow versus total-to-static expansion ratio with different speed lines. 42PDF Image | A Detailed Analysis of Radial Turbines
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