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4.2. The second radial turbine Volvo have performed tests on the radial turbine in their cold rig. The tests were per- formed with air as fluid and a constant inlet total temperature of 373 K. The rotational shaft speed were altered together with the total-to-total expansion ratio in order to gen- erate performance maps. It is possible to give the total-to-static expansion ratio, the mass flow and the static exit pressure as input variables in ”RIFT” but since none of those are available from the test results a total-to-static expansion ratio was guessed and iterated until the simulated total-to-total expansion ratio converged with the one from the tests. 4.2.1. Simulations The simulations in ”RIFT” were performed with the geometry, generated in a similar fashion as previously described in chapter 4.1. The inlet total temperature was held constant at 373 K and the outlet total pressure was held constant at 1.05 bar. The inlet total pressure was then calculated using the total-to-total expansion ratio (taken from the test results) and the outlet total pressure. The total-to-total expansion ratio varied and consequently also did the inlet total pressure. The simulations were performed to converge on the total-to-total expansion ratio as discussed previously. The same surface finish was used as for the first radial turbine presented in chapter 4.1, namely 64 μm. When performing the first couple of simulations it was observed that the simulated mass flow did not match the mass flow measured in the rig. It was concluded that the nozzle throat of the modeled geometry did not match the nozzle throat of the tested turbine. A simple fix to this problem was applied, namely to change the nozzle throat until convergence of the mass flow was achieved at the design point. The geometry was then locked and all simulation performed without changing it. Table 4.4.: The simulations on the second turbine were performed with a constant inlet total temperature and outlet total pressure. The inlet total pressure and shaft speed were altered. Each simulation used a number of iteration to converged on the specified total-to-total expansion ratio. The mass flow and total-to-total efficiency were calculated. Inlet total temperature, T01 Outlet total pressure, p09 Inlet total pressure, p01 Rotational speed, N Expansion ratio, p01 /p09 Mass flow, m ̇ 373 K 1.05 bar Varying Varying Specified Calculated Calculated Efficiency, ηT T 49PDF Image | A Detailed Analysis of Radial Turbines
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