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- Pressure Based Comparison of Different Gas Turbine Ground Vortex FlowsPublication . Barata, Jorge M M; Manquinho, Pedro; Silva, AndréThe present paper has the previous work of Barata et al in mind and has the purpose of analyzing the behavior of ground vortex flows through several values of height of the engine axis above the ground, diameter of engine intake and inlet airflow velocity using pressure on the ground and in a 3D scale for that.
- A Comparison of Different Gas Turbine Engines Ground Vortex FlowsPublication . Barata, Jorge M M; Manquinho, Pedro; Silva, AndréA computational method was used to predict and compare the ground vortices forming between the ground and a 1/1th scale model intake of different gas turbine engines. Calculations have been performed for the case of an irrotational crossflow mode of formation. Two different kinds of vortices appear around the intake: an inlet vortex and a trailing vortex. Away from the inlet plane other types of complex vortical structures were also identified. The computational method was found to describe all the main features of the flow for full scale geometry.
- Identification of Gas Turbine Ground Vortex Formation RegimesPublication . Barata, Jorge M M; Manquinho, Pedro; Silva, AndréIn the present paper the preliminary work of Barata et al.11 on gas turbine ground vortex formation is extended to include eighteen different engines that are presently in service. The ground vortex flows produced by each engine are compared and discussed for the corresponding operational condition. The results have shown that more than one mode can occur for a particular engine-velocity ratio-clearance distance combination with 1, 2 or 3 vortexes that may merge before entering the inlet engine. Further improvement of gas turbine design is then required to prevent hazardous operation of aircrafts in the airports.
- Identification of Gas Turbine Ground Vortex Formation RegimesPublication . Barata, Jorge M M; Manquinho, Pedro; Silva, AndréIn the present paper the previous work of Barata et al.11 is extended to include eighteen engines that are being used in the present. The ground vortex flows produced by the different engines are compared and discussed for each operational condition. The results have shown that more than one mode can occur for a particular engine-velocity ratio-clearance distance combination with 1, 2 or 3 vortexes that may merge before entering the inlet engine.