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6.1 Design and flow analysis of the turbine 89 0.5 0.4 0.3 0.2 0.1 0 0 0.2 0.4 0.6 0.8 1 1.2 Lenght parameter, [−] Design point 80% off−design 60% off−design Figure 6.11: Pressure distribution on the long wall of the nozzle at 60 % and 80 % off-design conditions and at the design condition. at rotor inlet might cause flow separation and low loading at the turbine rotor blades. The non-uniform flow field and high flow angles at off-design conditions should be taken into account when designing supersonic ORC turbines for applications having a non-constant heat rate to the process. The stator geometry could be improved in the future by bending and turning the stator blades as suggested by Harinck et al. (2013) to reach more uniform flow angle and velocity distribution at the stator outlet in design and off-design conditions. 15 10 5 0 −5 −10 −15 0 5 10 15 Circumferential angle, [θ] Design point 80% off−design 60% off−design Figure 6.12: Flow angle (α) distribution at the stator outlet at 60 % and 80 % off-design condi- tions and at the design condition. As discussed in the previous, the occurrence of oblique shock waves from stator blade trailing edge has a significant influence on the flow field. The position of the oblique shock wave was calculated analytically by using the theory from Anderson (1991) and compared to the results obtained in the CFD simulations. The CFD results of flow static Flow angle, [α−α ] p /p , [−] ref st tot,inPDF Image | WORKING FLUID SELECTION AND DESIGN OF SMALL-SCALE WASTE HEAT RECOVERY SYSTEMS BASED ON ORGANIC RANKINE CYCLES
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