Abstract
The performance of the compressor is of great importance in developing advanced engine technology, and it dramatically influences the cycle efficiency and safety of the engine. The compressor bleed requires a part of the main flow extraction from the passage, and the removal of the airflow plays an essential role in the performance of the compressor. The influence of the constant suction and pulsed suction on the flow structures and the aerodynamic performance in a compressor cascade, and the control mechanisms are numerically studied using large eddy simulation. At a suction mass flow rate of 0.25% of the main flow rate, constant suction leads to a 9.36% reduction in Cpt, while pulsed suction gains 24% more benefit in Cpt reduction on the basis of the constant suction with an excitation frequency of 100 Hz. It indicates that the pulsed suction has more significant potential to control the loss generation in the compressor. Afterward, the flow field of the baseline, constant suction, and pulsed suction are compared to find out the flow control mechanisms of the constant suction and pulsed suction. Two different formation mechanisms of the passage vortex are found due to the excitation effect of the pulsed suction. Besides, the results of proper orthogonal decomposition and dynamic mode decomposition show that the pulsed suction can simplify and stabilize the compressor flow field, which could lead to a further benefit in Cpt.
Highlights
The compressor is one of the critical components of the engine, and it plays a crucial role in guaranteeing the cycle efficiency and safety of the engine
The results indicate that the compressor suction is an efficient flow control method in managing the flow field where the flow separation exists
Based on the requirements of the compressor bleed and the application of the end-wall flow extraction, an experimental investigation has been performed by us (Zhang and Chen, 2021) to validate the effect of the pulsed suction (PS) control on a high-loading compressor cascade, and the results indicate that the PS has a better efficiency improvement than the constant suction (CS)
Summary
The compressor is one of the critical components of the engine, and it plays a crucial role in guaranteeing the cycle efficiency and safety of the engine. The compressor in the modern aeroengine is often designed with high loading to reduce the weight of the engine or increase the pressure before the burner. This may induce more serious flow separation within the compressor and further leads to the efficiency or stability loss of the compressor. Compared with the passive ones, the active flow control methods (Kerrebrock et al, 1997; Kerrebrock et al, 2008; Jabbal et al, 2013) can adjust according to the operating condition of the compressor; they may be applied as more flexible in many cases, especially for some highly maneuverable aircraft
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