Investigation of Flow Characteristics in Rotating Distributary and Confluence Cavities DOI Creative Commons
Kuan Zheng,

Huan Ma,

Hongchuang Sun

et al.

Energies, Journal Year: 2025, Volume and Issue: 18(5), P. 1287 - 1287

Published: March 6, 2025

Power generation is an important part of air vehicle energy management when developing long-endurance and reusable hypersonic aircraft. In order to utilize turbine power system on board, fuel-based rotating cooling has been researched cool the turbine’s rotor blades. For fuel-cooling turbines, each blade corresponds a separate channel. All channels cross together form distributary cavity confluence in center disk. determine flow characteristics cavities, computational fluid dynamics (CFD) simulations using shear–stress–transport turbulence model were carried out under conditions different speeds mass rates. The results showed great differences between non-rotating cavities. cavities rotational velocity, with obvious layering distribution regularity. Moreover, high-speed surface formed original structure, due combined functions centrifugal force, inertia, Coriolis force. Great pressure loss occurs passes through surface. This increases increase speed rate. Finally, four structures compared, optimal structure separated outlet channel was identified as best eliminate this loss.

Language: Английский

Multi-field coupling particle flow dynamic behaviors of the microreactor and ultrasonic control method DOI
Lin Li, Pu Xu, Qihan Li

et al.

Powder Technology, Journal Year: 2025, Volume and Issue: unknown, P. 120731 - 120731

Published: Jan. 1, 2025

Language: Английский

Citations

15
A coupled LBM-LES-DEM particle flow modeling for microfluidic chip and ultrasonic-based particle aggregation control method DOI
Lin Li, Pu Xu, Qihan Li

et al.

Applied Mathematical Modelling, Journal Year: 2025, Volume and Issue: unknown, P. 116025 - 116025

Published: Feb. 1, 2025

Language: Английский

Citations

12
Investigate on the Fluid Dynamics and Heat Transfer Behavior in an Automobile Gearbox Based on the LBM-LES Model DOI Creative Commons

Gaoan Zheng,

Pu Xu, Lin Li

et al.

Lubricants, Journal Year: 2025, Volume and Issue: 13(3), P. 117 - 117

Published: March 10, 2025

With the rapid development of new energy vehicle market, demand for efficient, low-noise, low-energy consumption, high-strength, and durable gear transmission systems is continuously increasing. Therefore, it has become imperative to conduct in-depth research into fluid heat transfer lubrication dynamics within gearboxes. In systems, interaction between fluids solids leads complex nonlinear characteristics gears lubricants, making resolution gearbox thermodynamic models highly challenging. This paper proposes a model based on LBM-LES coupling study dynamic laws process. The results indicate that intense shear effects caused by high speeds generate vortices, which are particularly pronounced larger gears. mixing effect in these vortex regions better, achieving more uniform dissipation effect. Furthermore, flow lubricant closely related speed temperature. Under high-temperature conditions (such as 100 °C), diffusion range increases, forming wider oil film, but its viscosity significantly decreases, leading greater stirring losses. By optimizing selection lubricants parameters, efficiency reliability system can be further improved, extending service life. provides comprehensive analytical framework multi-stage clarifying mechanisms offering insights theoretical foundations future engineering applications this field.

Language: Английский

Citations

2
Interlayer healing mechanism of multipath deposition 3D printing models and interlayer strength regulation method DOI
Pu Xu, Qihan Li, Chengyan Wang

et al.

Journal of Manufacturing Processes, Journal Year: 2025, Volume and Issue: 141, P. 1031 - 1047

Published: March 14, 2025

Language: Английский

Citations

2
Study on the Dynamic Modeling of Two-Phase Flow and Lubrication Characteristics of Toothless Stirring Oil Pans DOI Open Access

Yiming Huang,

Man Ge,

Gaoan Zheng

et al.

Processes, Journal Year: 2025, Volume and Issue: 13(3), P. 829 - 829

Published: March 12, 2025

The toothless oil stirring disk is vital in modern transmission technology, particularly fields like aviation, aerospace, and nuclear power, significantly impacting equipment performance. Oil-stirring lubrication widely used internal systems due to its simplicity high reliability, but oil-stirring losses during contribute increased system temperatures, affecting lifespan Accurate simulation of the two-phase flow process high-speed disks crucial for extending service life. This paper proposes a dynamic modeling approach disks, integrating volume fluid (VOF) model RNG k-ε turbulence model, alongside spring smoothing mesh reconstruction techniques. explores distribution high-speed, pans, investigating effects different pan speeds heights on Results indicate that speed height are key improving efficiency. At speeds, centrifugal force gravity cause lubricating detach from surface, continuing splash inertia. 3200 r/min an level 20 mm, stable film forms gearbox. Higher generate greater turbulence, enhancing effectiveness. findings offer theoretical insights support gearbox design optimization aerospace similar fields.

Language: Английский

Citations

0
Abrasive Flow Material Removal Mechanism Under Multifield Coupling and the Polishing Method for Complex Titanium Alloy Surfaces DOI Open Access

Yufei Fu,

Rui Wang, Zhongfei Wang

et al.

Processes, Journal Year: 2025, Volume and Issue: 13(2), P. 416 - 416

Published: Feb. 5, 2025

This study addresses the challenge of uneven surface quality on concave and convex regions during precision machining titanium alloy thin-walled complex curved components. An electrostatic field-controlled liquid metal-abrasive flow polishing method is proposed, which examined through both numerical simulations experimental investigations. Initially, a material removal model for under field control developed, with computational fluid dynamics (CFD) discrete phase models employed simulations. Subsequently, motion characteristics metal droplets varying amplitudes alternating electric fields are experimentally observed within processing channel. serves to validate effectiveness proposed in enhancing uniformity across Our results demonstrate that by controlling distribution strengths, roughness differences between surfaces workpiece reduced degrees. Specifically, group subjected 24 V field, difference minimized 58 nm, representing 44% reduction compared conventional abrasive polishing. These findings indicate significantly enhances areas

Language: Английский

Citations

0
Computational Fluid Dynamics Simulation and Reaction Network Modelling for the Hydrothermal Liquefaction of Shorea Wood Sawdust DOI Creative Commons
Mohamed Elhassan, Muhammad Raziq Rahimi Kooh, Yuan‐Fong Chou Chau

et al.

Energies, Journal Year: 2025, Volume and Issue: 18(5), P. 1145 - 1145

Published: Feb. 26, 2025

This study investigates the hydrothermal liquefaction (HTL) aqueous phase (AP) of Shorea sawdust in a semi-flow batch reactor, focusing on reaction network and computational fluid dynamics (CFD) simulation. High-performance liquid chromatography (HPLC) was used to detect lignocellulosic decomposition compounds, revealing presence glucose, galactose, xylose, furfural, ethanol, other undefined compounds due decomposition. Reaction ordinate (R0) indicates that progresses steadily as time increases, higher temperature leads greater ordinate, agreeing with Arrhenius’ assumption gained energy enables molecules overcome activation barrier. However, saccharide C6 C5 yield at 220 °C fluctuates suggesting secondary reactions. A kinetic model built based network, which developed HPLC results. Arrhenius parameters revealed is influenced by time, whereas ethanol production are dependent. In contrast, glucose formation both temperature. The prediction yields confirmed optimal for production, balancing slow reactions rapid degradation. CFD simulations show uniform pressure distribution inside chamber high localised input (1570 Pa). addition, feedstock particles tend distribute along wall because laminar flow, consistent observation experiment. findings highlight intricate relationship between conditions composition HTL product, contributing more comprehensive understanding process.

Language: Английский

Citations

0
Numerical Study of the Effect of Winglets with Multiple Sweep Angles on Wind Turbine Blade Performance DOI Creative Commons

Bayu K. Wardhana,

Byeong-Rog Shin

Energies, Journal Year: 2025, Volume and Issue: 18(5), P. 1292 - 1292

Published: March 6, 2025

A numerical study was conducted on winglet designs with multiple sweep angles for improving the performance of horizontal axis wind turbine (HAWT) blades, and their effect reducing wing tip vortex investigated by CFD analysis. The effects were examined through NREL Phase VI blades considering a speed range 7 to 25 m/s. Numerical simulations performed using RANS equations SST k–ω turbulence model. interaction blade rotation flow modeled moving reference frame method. results found be in good agreement inferences drawn from experiments baseline without winglet, thereby validating computational investigations revealed that multi-swept winglets predicted 14.6% torque increment, providing higher power output than single-swept compared at 15 Implementing design can improve effectively further increments length.

Language: Английский

Citations

0
Investigation of Flow Characteristics in Rotating Distributary and Confluence Cavities DOI Creative Commons
Kuan Zheng,

Huan Ma,

Hongchuang Sun

et al.

Energies, Journal Year: 2025, Volume and Issue: 18(5), P. 1287 - 1287

Published: March 6, 2025

Power generation is an important part of air vehicle energy management when developing long-endurance and reusable hypersonic aircraft. In order to utilize turbine power system on board, fuel-based rotating cooling has been researched cool the turbine’s rotor blades. For fuel-cooling turbines, each blade corresponds a separate channel. All channels cross together form distributary cavity confluence in center disk. determine flow characteristics cavities, computational fluid dynamics (CFD) simulations using shear–stress–transport turbulence model were carried out under conditions different speeds mass rates. The results showed great differences between non-rotating cavities. cavities rotational velocity, with obvious layering distribution regularity. Moreover, high-speed surface formed original structure, due combined functions centrifugal force, inertia, Coriolis force. Great pressure loss occurs passes through surface. This increases increase speed rate. Finally, four structures compared, optimal structure separated outlet channel was identified as best eliminate this loss.

Language: Английский

Citations

0