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28 26 24 22 20 18 16 14 12 950 TET=6500C 800 850 900 PRc=2 3 750 4 4.5 TIT=7000C 25 75 125 Specific work (kJ/kg) Figure 4: Performance diagram for different cycle parameters It can be seen that higher TIT leads to higher efficiency and specific work which are desirable in general, but turbine inlet temperature is limited by materials considerations and maximum temperature attainable by the receiver as mentioned above. A constant TET 650oC line is also shown in figure 4 as this temperature is the maximum allowed for a stainless steel recuperator. The TET line shows that for turbine inlet temperatures higher than 800 0C, the recuperator will be overheated at low pressure ratios. This is the case when running the engine at low speeds. At TIT of 800oC, maximum cycle efficiency occurs at pressure ratio of three. Using the selected pressure ratio and turbine inlet temperature, the cycle analysis results which are related to the turbine are summarised in table 2. A rotational speed of 130,000 rpm was selected to achieve the highest compressor and turbine efficiency at their respective specific speeds. Table 2: Cycle analysis results Parameter Turbine inlet total pressure (bar) Turbine inlet total temperature (K) Turbine mass flow rate (kg/s) Power generated by turbine (kW) 2.2- MEANLINE DESIGN: Value 2.919 1073 0.08 18.02 A mean line or one-dimensional design approach is the application of basic equations and empirical relations to calculate the overall design parameters. Mean line design is a good approach to get the first estimate for the radial turbomachine design and analysis as it is a fast method and needs a small amount of information regarding the turbomachine geometry. Also, a number of design options can be checked before moving to advanced stages of system design including three dimensional geometry construction and computational analysis software. 5 Cycle efficiency (%)PDF Image | Optimised Radial Turbine Design D1.8
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