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9th International Conference on Compressors and their Systems IOP Publishing IOP Conf. Series: Materials Science and Engineering 90 (2015) 012062 doi:10.1088/1757-899X/90/1/012062 of steam inlet and outlet pressures and different turbine speeds. Useful electrical power achieved, even at low steam flow rates providing a useful turndown range. Figure 8. Performance map 6. Minimising losses Minimising losses is essential to achieve an attractive investment for a customer. Live steam tests were conducted to measure the seal leakage rates to ensure that they were within expectations and it can be seen the table in Figure 9 that the leakage rates were below 1% of the flow rate through the turbine. The tests also validated CFD models of the labyrinth seal. Inlet Pressure (Barg) 6.9 9.9 10.3 Leakage (%) of Steam Mass Flow 0.79 0.88 0.82 Figure 9. Table of steam seal leakage rate measured as a proportion of the total steam mass flow rate through the turbine. Electrical losses were measured and are summarised in Figure 10. It should be noted that the overall value of these losses is very low and would compare very favourably with a traditional turbine driving a generator through a gear box. 10PDF Image | IOP Science The Development of a Small High Speed Steam Microturbine Generator System
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