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Total-to-total expansion ratio Figure 4.4.: The mass flow as a function of total-to-total expansion ratio with dif- ferent dimensionless shaft speeds. The circles represent the simulation results and the squares represent the experimental results. 4.1.2. Simulations on the tested turbine The second part of simulations was performed on the tested turbine. ”Tested” in the meaning that it refers to the scaled turbine. The tests in the rig were performed with air as fluid and as a consequence so were the simulations. The inlet total temperature and the outlet static pressure was fixed at 373K and 1.07bar respectively. The inlet total pressure and the rotational speed were then altered while the mass flow was calculated to generate the convergence described previously. The input flow variables are summarized in table 4.3. The geometry for the original turbine where scaled by a factor of 0.7 and then imported into program ”RIGPAC”. From ”RIGPAC” the mean-line geometry was exported to ”RIFT”. No diffusor was used and a volute was created to guide the flow onto the nozzle blades with as little 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 and a radial clearance of 0.5 mm was used for the impeller. The results are presented in the same manner as for the original turbine discussed previ- ously. Figures 4.5 and 4.6 show the error between the experimental results and simulation 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-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 4.7, which shows the mass flow versus total-to-total expansion 44 Mass flow (kg/s)PDF Image | A Detailed Analysis of Radial Turbines
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