Journal of Building Engineering, Journal Year: 2024, Volume and Issue: 98, P. 111083 - 111083
Published: Oct. 18, 2024
Language: Английский
Physics of Fluids, Journal Year: 2025, Volume and Issue: 37(2)
Published: Feb. 1, 2025
Proper orthogonal decomposition (POD) is a widely used data-driven, reduced-order method for feature extraction and field reconstruction of unsteady flows. The number modes required in the POD varies greatly with flow characteristics, high significant challenge to effective multiscale analysis. first part this study shows that increases almost linearly energy proportion stochastic fluctuation, making it costly accurately reconstruct fluctuation To address issue, second proposes frequency domain proper (FDPOD) method, which reduces accurate while preserving key spectral characteristics flow. Three case studies, i.e., cylinder flow, jet fan are employed illustrate advantage developed FDPOD provides more efficient tool turbulence analysis, especially flows dominated by fluctuations.
Language: Английский
Citations
0
Building and Environment, Journal Year: 2025, Volume and Issue: unknown, P. 112804 - 112804
Published: March 1, 2025
Language: Английский
Citations
0
International Journal of Hydrogen Energy, Journal Year: 2024, Volume and Issue: 86, P. 519 - 529
Published: Aug. 31, 2024
Language: Английский
Citations
2
Physics of Fluids, Journal Year: 2024, Volume and Issue: 36(9)
Published: Sept. 1, 2024
The impeller of the multi-blade centrifugal fan significantly impacts fan's internal flow field and aerodynamic performance. To improve axial distribution along suppress blade passage backflow at outlet fans, a method variable chord length design is proposed. Simultaneously, optimization models are established with static pressure efficiency as objectives. By altering control points Bezier curve, leading-edge profile optimized. results indicate that using blades can expand operating range fan. maximum rate improvement reaches 10.6%. Significant enhancements in observed low rates, 4.9%. enables adjustment to better match impeller's requirements. This leads increased on both shroud hub sides impeller, consequently reducing area improving phenomenon. Moreover, facilitate more uniform circumferential outlet, diversion volute tongue, mitigating separation within passage, weakening interaction between lowering energy losses impeller–volute tongue regions. Consequently, this enhances performance fans.
Language: Английский
Citations
2
Physics of Fluids, Journal Year: 2023, Volume and Issue: 35(12)
Published: Dec. 1, 2023
This research was inspired by the long-eared owl's ability to fly silently. For first time in this study, a wind turbine blade is designed mimic wing surface and leading edge of owl. The commonly used two-dimensional profile previous studies replaced more effective three-dimensional profile. change leads improved aerodynamic performance multi-blade centrifugal fan reduced noise levels. airfoil parameters owl were extracted utilized. These develop fitting formula based on their correlation. facilitated design optimization bionic (B-Blade). results indicate 4.1% enhancement maximum flow rate compared original fan, alongside reduction 1.3 dB(A) under identical static pressure conditions. An examination internal flow, noise, sound source characteristics both types conducted, elucidating mechanism. Fan propagation showed pronounced dipole traits. area at B-Blade fan's inlet volute tongue compact, decrease mid-low frequency discrete noise. intensity also diminished. ameliorated distribution impeller outlet, reducing unstable interaction between tongue, thereby effectively diminishing
Language: Английский
Citations
5
Journal of Building Engineering, Journal Year: 2024, Volume and Issue: 98, P. 111083 - 111083
Published: Oct. 18, 2024
Language: Английский
Citations
0