Abstract
Fuel pump is a crucial component in aircraft engine ignition system. For the hi-speed axial fuel pumps, rotating stall triggers vortex and affects the operation stability and security. Sweep blade is widely used to solve the stability problems in aerodynamics field. Investigation on the hydrodynamics was conducted in this study. Based on the typical straight blade pump, positive and negative sweep blade pumps were modeled. With the large eddy simulation method, CFD simulations were conducted to calculate and analyze the flow characteristics in the pump models. To verify the simulation, experiments were also launched on the hydraulic test rig. Results show that the vortex occurs at the suction surface of blade and gathers near the blade tip region. Positive sweep blade is effective to reduce the hydraulic losses by driving the stalled fluid into the mid-part of blade. By applying the positive sweep blade on the axial fuel pump, the instability operating region will be diminished. Adopting sweep blade provides an effective means for stability and security of axial fuel pumps.
Highlights
Hi-speed axial fuel pump is a crucial component of aircraft engine ignition system
This paper investigated the hydrodynamics of sweep blade in high-speed axial fuel pump
The hydrodynamics of sweep blade were investigated based on the hi-speed axial fuel pump
Summary
Hi-speed axial fuel pump is a crucial component of aircraft engine ignition system. To evaluate the hydrodynamic performance of hi-speed axial fuel pump, efficiency and stability are the most important consideration factors. Results by Li et al [2], Vad [4], and McNulty et al [5] show that sweep blade can improve the aerodynamics performance of fans and compressors, including increasing total-pressure peak value, enhancing efficiency, and widening no-stall range. By both CFD simulations and experiments, Gallimore et al [1, 3]. The performances of positive-dihedral, negative-dihedral, and straight-lined stacking blades will be investigated with both numerical and experimental methods This investigation would find out how to enhance the operating stability and efficiency of hi-speed axial pump and provide valuable references in engineering application
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