Abstract
In addition to aspiration drag, the advantages gained by dual-bell nozzle utilization in practice are circumvented with a dip of thrust during operation mode transitions that occur outside of the optimal conditions. Practical transition from lowto high-altitude operationmode occurs at lower nozzle pressure ratios (NPRs) than the optimum transition point. The influence of the film-cooling flow on nozzle operationmode transition is investigated. It is found that the operationmode transitionNPR is increased, and the thrust dip during the transition is decreased through the injection of the film-cooling flow with an appropriate inlet pressure and flow rate.
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