"Method For Starting A Turbomachine"

Abstract: Embodiments of the present invention employ a closed loop controls philosophy (400) that actively determines the air-to-fuel ratio of turbomachine (100) throughout the start-up process. This closed loop controls philosophy (400) provides many benefits. This philosophy (400) performs the ignition process while the turbomachine (100) is operating at a purge speed and eliminates the associated coast down period. Reduces or eliminates the warm-up timer. The philosophy (400) may also increase the acceleration rate of the turbomachine (100) to the primary operating speed. These benefits may reduce the overall start-up time of the turbomachine (100). Furthermore, by actively controlling the air-to-fuel ratios during the start-up processes, the turbomachine (100) may be operated on a nearly optimal and repeatable schedule. These benefits may reduce thermal transients, possibly extending parts life; reduce variations in start-up times, and possibly increasing combustor margin.

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