Roger L. Davis

Multi-Component Turbomachinery Steady-Flow Simulations

Main-Secondary Coupled Simulation

The results from a steady, viscous flow simulation of the main flow path of a modern jet engine transonic high-pressure turbine, transition duct, and first vane of the low-pressure turbine coupled with the secondary-air system under the high-pressure turbine are shown below.   The secondary-air system configuration includes the lower cavity near the centerline, the mid-cavity with the tangential on-board injection nozzle and pump, and the upper rim-cavity.   In addition, the flow through the inner tangential on-board injection seal and labyrinth seals that separate the cavities is included.   The purpose of this investigation has been to determine the feasibility of using computational procedures to predict the steady-flow interaction effects between the main and secondary-air system flow, the ability to predict flow splits in the secondary-air system, and the numerical issues associated with such a computation.

For further information, please see “Prediction of Main/Secondary-Air System Flow Interaction in a High-Pressure Turbine,” Davis, R. L., Yao, J., Alonso, J. J., Paolillo, R. and Sharma, O. P., AIAA Journal of Propulsion and Power, Nov-Dec 2004.