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A computational analysis is carried out on the influence of turbine inlet temperature distortion (hot streaks) from both blade aeromechanical (forced vibration) and aerothermal (heat transfer) viewpoints. Analysis of hot streaks with variable circumferential lengths, corresponding to different numbers of combustion burners, shows that the circumferential wavelength of the temperature distortion can significantly change unsteady forcing and the heat load on rotor blades. When the hot-streak wavelength is the same as the nozzle-guide-vane blade pitch, there is a strong dependence of the preferential heating on the relative clocking position between the hot streak and nozzle-guide-vane blade. However, this clocking dependence is shown to be qualitatively weakened for the cases with fewer hot streaks with longer circumferential wavelengths.
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He et al. (2007) studied this question.
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