Patent ID: 7921651
Filing Date: 2011-04-12
Classification: F02C,F05D,F23R

Abstract:
1. A method of operating a fuel delivery system comprising (a) a low energy gas delivery system comprising a low energy gas inlet, a fuel and manifold flow split, a low energy gas primary manifold outlet, and a low energy gas secondary manifold outlet; (b) a high-energy gas delivery system comprising a high-energy gas inlet and a high-energy gas primary manifold outlet; (c) a primary manifold comprising a primary manifold nozzle outlet; and (d) a secondary manifold comprising a secondary manifold nozzle outlet, wherein the low energy gas primary manifold outlet and the high-energy gas primary manifold outlet are coupled to the primary manifold, the low energy gas secondary manifold outlet is coupled to the secondary manifold, the low energy gas delivery system further comprises a primary low energy gas control valve between the gas split and the low energy gas primary manifold outlet, the low energy gas delivery system further comprises a secondary low energy gas control valve between the gas split and the low energy gas secondary manifold outlet, and the high-energy gas delivery system further comprises a high-energy gas control valve between the high-energy gas inlet and the high-energy gas primary manifold outlet, the method of operating comprising: selecting a fuel flow split between the low energy gas delivery system and the high-energy gas delivery system; setting the stroke of the high-energy gas control valve based on the fuel split; measuring the primary manifold nozzle pressure ratio across the primary manifold nozzle outlet; comparing the primary manifold nozzle pressure ratio against a primary manifold specification limit; adjusting the stroke of the primary low energy gas control valve to maintain the pressure ratio across the primary manifold nozzle outlet within the primary manifold specification limit; adjusting the stroke of the primary low energy gas control valve to maintain equal nozzle pressure ratio across the primary and secondary manifold nozzle outlets; measuring the secondary manifold nozzle pressure ratio across the secondary manifold nozzle outlet; comparing the secondary manifold nozzle pressure ratio against a secondary manifold specification limit; and adjusting the stroke of the secondary low energy gas control valve to maintain the pressure ratio across the secondary manifold nozzle outlet within the secondary manifold specification limit.