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S-duct flow distortion with non-uniform inlet conditions
Matteo Migliorini1, Pavlos K Zachos1, David G MacManus1
1Centre for Propulsion and Thermal Power Engineering, School of Aerospace Transport and Manufacturing, Cranfield University, Cranfield, Bedfordshire, UK.
Proceedings of the Institution of Mechanical Engineers. Part G, Journal of Aerospace Engineering
|January 23, 2023
Summary
Investigating S-duct intakes reveals that non-uniform inlet conditions significantly impact flow distortion. Understanding these effects is crucial for accurate aero-engine performance assessment and design.
Area of Science:
- Aerospace Engineering
- Fluid Dynamics
- Turbomachinery
Background:
- Convoluted aero-engine intakes are essential for airframe integration.
- Previous research primarily examined S-duct distortion under undistorted inlet conditions.
Purpose of the Study:
- To investigate the impact of challenging inlet conditions, specifically vortices and non-uniform total pressure, on S-duct intake flow distortion.
- To assess the unsteady flow characteristics and peak distortion levels under these conditions.
Main Methods:
- Stereo Particle Image Velocimetry (SPIV) was employed to analyze flow dynamics.
- Extreme Value Theory (EVT) was used to model peak distortion levels.
Main Results:
- Inlet vortices altered flow switching but had minor effects on peak distortion and unsteadiness.
- Non-uniform total pressure profiles amplified peak swirl intensity and its unsteadiness.
- Swirl angle fluctuation frequency depended on the azimuthal distribution of non-uniform pressure.
Conclusions:
- Inlet flow conditions substantially alter S-duct intake flow distortion characteristics.
- Unsteady swirl distortion measurements and statistical models are vital for assessing peak distortion accurately.
- Accurate modeling requires considering the influence of inlet flow conditions on intake performance.
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