Experimental investigation of unsteady nature of shock waves induced by various ramps DOI
TH Gan, Qiong Wang

Physics of Fluids, Journal Year: 2024, Volume and Issue: 36(12)

Published: Dec. 1, 2024

The ramp induced shock wave boundary layer interaction (RI-SWBLI) has been investigated experimentally at different angles in a Ma = 3 flow. unsteady nature examined detail by using semi-quantitative processing of Schlieren images. shock-wave locations are extracted to allow spectral analysis the oscillations. Results show that motion is associated with state separation, which categorized into three classifications based on measurements, namely, unseparated, initially separated, and fully separated. statistical oscillation illustrates probability distribution function power density (PSD) along two certain height follow almost same principles time–frequency domain. PSD results significant variations lower location occur 30° flow according PSD, characterized energy, wide range, uniformly distributed motion. reattachment events first rises 24° With increase angle, axial position peak slowly transfers upstream positions. Moreover, conceptual model proposed preliminarily reveal RI-SWBLI, including scenarios: In nonseparating flows, mainly affected turbulent shear ramp. During initial separation process, pulsations bubble. full impact movement primarily controlled newly designed aerodynamic

Language: Английский

Optimization design method based on parameter reduction and active subspaces: Redistribution of chordwise loading at blade tips in a transonic axial-flow fan DOI

Tao Ma,

Hanan Lu, Qiushi Li

et al.

Physics of Fluids, Journal Year: 2024, Volume and Issue: 36(9)

Published: Sept. 1, 2024

In practical optimization design, an excessive number of design variables have a highly detrimental influence on the efficiency and accuracy final scheme expose problem to curse dimensionality. Therefore, incorporating only most essential into facilitates obtaining accurate cost-efficient solutions. Reported here is method based parameter reduction active subspaces, it used redistribute tip load in transonic fan. Specifically, coupled strategy developed reduce parameters needed describe three-dimensional blade shape, which leads far fewer being involved design. Moreover, subspaces are perform sensitivity analysis establish low-dimensional surrogate models. After represented effectively by three parameters, each has significant fan performance. Three one-dimensional established for maximum mass flow rate, total pressure ratio, efficiency, linear models obtained. Next, chordwise loading optimized, after rotor at point increased 1.1%, while ratio remains nearly unchanged. Finally, field analyzed understand mechanism this performance improvement, results show that optimized reduces aerodynamic losses caused shock-induced separation interaction between shocks leakage flows.

Language: Английский

Citations

5
Effect of radial inlet distortion on aerodynamic stability in a high load axial flow compressor DOI
Zhonggang Fan, Yang Liu, Dun Ba

et al.

Physics of Fluids, Journal Year: 2024, Volume and Issue: 36(10)

Published: Oct. 1, 2024

Radial inlet distortion induced by boundary layer separation can significantly affect the aerodynamic performance of compressor. The effect radial on flow structure is numerically investigated in a high load axial determined experimental results at downstream generator. reveal that tip leads to reduction stall margin, whereas hub extends it. redistributes main toward undistorted region due obstructive lattice ring. deficit velocity with causes rotor operate higher incidence angle near casing, while alleviates blade loading. detailed three-dimensional field analysis indicates increased loading shifts trajectories both primary and secondary leakage leading edge, thereby expanding blockage region. Conversely, unloads region, reducing flow. Additionally, distortion, location line suction surface moves closer around trailing edge intensified.

Language: Английский

Citations

4
Design optimization of axial slot casing treatment and blade in an axial compressor based on deep learning and reinforcement learning DOI

Zhonggang Fan,

Yue Wu, Dun Ba

et al.

Aerospace Science and Technology, Journal Year: 2025, Volume and Issue: unknown, P. 110209 - 110209

Published: April 1, 2025

Language: Английский

Citations

0
Experimental investigation of unsteady nature of shock waves induced by various ramps DOI
TH Gan, Qiong Wang

Physics of Fluids, Journal Year: 2024, Volume and Issue: 36(12)

Published: Dec. 1, 2024

The ramp induced shock wave boundary layer interaction (RI-SWBLI) has been investigated experimentally at different angles in a Ma = 3 flow. unsteady nature examined detail by using semi-quantitative processing of Schlieren images. shock-wave locations are extracted to allow spectral analysis the oscillations. Results show that motion is associated with state separation, which categorized into three classifications based on measurements, namely, unseparated, initially separated, and fully separated. statistical oscillation illustrates probability distribution function power density (PSD) along two certain height follow almost same principles time–frequency domain. PSD results significant variations lower location occur 30° flow according PSD, characterized energy, wide range, uniformly distributed motion. reattachment events first rises 24° With increase angle, axial position peak slowly transfers upstream positions. Moreover, conceptual model proposed preliminarily reveal RI-SWBLI, including scenarios: In nonseparating flows, mainly affected turbulent shear ramp. During initial separation process, pulsations bubble. full impact movement primarily controlled newly designed aerodynamic

Language: Английский

Citations

0