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An aero analysis was performed for both a cold start up and emergency trip shut down. Aero analysis data for convective heat transfer coefficients provided blade sink temperature at tip, mid-span and root, and rotational velocity as a function of time. Transient structural analyses were performed using this data. The results were examined for thermal transients that may cause locally high stress. The cold startup analysis assumed that all hardware had an initial temperature of -10°F. Figure 2.1.19 shows blade midspan sink temperature and shaft rotation as a function of time. Data for the first 100 seconds of operation were provided and simulated. The simulated start up is from a stationary rotor to idle (not full power). The final rotor rpm is 50% of max power and the idle blade sink temperature is approximately 1200°F lower than maximum power. Figure 2.1.20 contains a plot of rotor maximum principle stress as a function of start up time. 1200 1000 800 600 400 200 0 -200 0 Mid Span Sink Temp 20 40 60 80 Time (sec) 100 120 40000 30000 20000 10000 Rotor RPM 0 0 20 40 60 80 100 120 Time (sec) Figure 2.1.19 Startup midspan blade sink temperature and rotor speed as a function of time 36 Rotor (RPM) Temp (F)PDF Image | ADVANCED MICROTURBINE SYSTEMS Final Report for Tasks 1 Through 4 and Task 6
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