Coupled heat transfer analysis of internal and film cooling of turbine blade under medium temperature conditions

Jin, W.; Jia, Yang; Lei, J.; Ji, W.T.; Wu, Jiongyang

doi:10.1016/j.applthermaleng.2022.118792

Cited by 21 publications

(5 citation statements)

References 37 publications

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“…In addition, the temperature distribution in the airstream field is an important part of melt-blowing, and the exchange of thermal energy in the flow field must be considered. The basic equations of the mathematical model of the meltblown airstream field are thus the mass equation, momentum equation, energy equation, turbulent kinetic energy equation, and specific dissipation rate equation. ,, …”

Section: Modeling and Methodsmentioning

confidence: 99%

See 1 more Smart Citation

Influence of a Meltblown Die with a Laval Airstream Channel on the Manufacturing Process of a Polymer Fiber Based on an Orthogonal Test and Simulation Analysis

Guo,

Zhu

2023

ACS Omega

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A Laval nozzle is a device that accelerates a low-speed airstream to form a high-speed airstream. In this work, we use a Laval nozzle in the airstream channel design of a meltblown die to improve the tensile properties of the fiber in the airstream field of the meltblown die. The features of the airstream field of the meltblown die are analyzed by numerical simulation. For a given parametrization, six factors may be tuned to optimize the performance of the Laval airstream channel of the meltblown die. We thus use a five-level, six-factor orthogonal test method to optimize the airstream channel of the meltblown die to determine the various factors that influence the airstream field beneath the meltblown die. The results show that the optimized Laval meltblown die performs better than the traditional die and that the widths of the larynx and expansion segment most strongly affect the airstream velocity beneath the Laval meltblown die. Compared with a traditional die, the Laval die optimized by orthogonal testing increases the peak airstream velocity by 17.54%, average velocity by 96.81%, average temperature by 12.32%, and peak pressure by 14.61% and produces weaker turbulence intensity near the spinneret. These characteristics make the airstream beneath the die more stable and uniform and accelerate the attenuation of the fiber diameter, producing more polymer nanofibers. These results demonstrate a valuable approach to the design and optimization of meltblown dies and provide a technical reference for the production and application of the meltblown fiber production equipment.

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Section: Modeling and Methodsmentioning

confidence: 99%

“…The basic equations of the mathematical model of the meltblown airstream field are thus the mass equation, momentum equation, energy equation, turbulent kinetic energy equation, and specific dissipation rate equation. 35 , 38 , 39 …”

Section: Modeling and Methodsmentioning

confidence: 99%

Influence of a Meltblown Die with a Laval Airstream Channel on the Manufacturing Process of a Polymer Fiber Based on an Orthogonal Test and Simulation Analysis

Guo,

Zhu

2023

ACS Omega

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“…The gas turbine cooling system [27,28] is a multivariable, strongly coupled and nonlinear complex system. From the perspective of the safety of production, the gas turbine cooling automatic control system can avoid the injury of operators caused by manual control, improve the working environment and ensure a smooth production.…”

Section: Gas Turbine Cooling Systemmentioning

confidence: 99%

Design of Gas Turbine Cooling System Based on Improved Jumping Spider Optimization Algorithm

Liu

Chen³

2022

Machines

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The gas turbine cooling system is a complex MIMO system with a strong coupling, nonlinear, time-varying and large disturbance amplitude. In order to automatically control the target flow, target temperature and pipeline pressure, in this paper, the decoupler and regulator of a gas turbine cooling system are designed. Firstly, the working principle of a gas turbine cooling system and the coupling between the controlled variables of the system are analyzed. The decoupler of the system is designed by using the diagonal matrix decoupling method. The transfer function models of the coupling system are built through system identification, and the decoupling matrix of the system is calculated according to the diagonal matrix decoupling method and transfer function models. Then, the engine cooling control system simulation model is constructed and an improved jumping spider optimization algorithm is proposed. The parameters of the controller are optimized by the improved jumping spider optimization algorithm. Finally, the control system simulation is done and compared with the jumping spider optimization algorithm and the particle swarm optimization algorithm. The simulation results show that the improved jumping spider optimization algorithm is more suitable for the multivariable strong coupling nonlinear engine cooling system. For the flow and pressure control, the transient time and overshoot are reduced, and the steady-state error is less than 1%. For the temperature control, the result of the improved jumping spider optimization algorithm is more smooth, without overshoot, and almost does not exceed the set inlet water temperature. The overshoot, steady-state errors and transient time of the system have been improved, which proves the feasibility and significance of the improved jumping spider optimization algorithm by comparing the control performance and optimization time.

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“…The turbine blade is a core component of the turbine unit used in thermal power stations, and it plays an important role in converting the kinetic energy of high-temperature steam into mechanical energy [1,2]. As turbine blades are in a water-rich environment under high temperature, pressure, and rotational speed for a long time, they are prone to damage or even fracture [3,4], and general metals and composites cannot meet these working requirements. Some nickel-based single-crystal high-temperature alloys, however, have excellent hightemperature strength, oxidation resistance, and thermal corrosion resistance [5,6], enabling them to maintain excellent service performance in high-temperature environments and, hence, be used in aero-engine blades and turbine blades.…”

Section: Introductionmentioning

confidence: 99%

Molecular dynamics study of the repetitive friction mechanism of nickel-based single crystals in an aqueous environment

Zheng¹,

Zhang²,

Zhu³

et al. 2023

Phys. Scr.

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In this study, molecular dynamics simulations were used to simulate the iterative rotational friction of nickel-based single crystals using diamond grinding balls in both the presence and absence of water. First, the friction force, depth and morphology of wear marks, wear rate, and evolution of internal defects during the friction process of nickel-based single crystals were investigated. Second, a comparative study of the frictional wear of nickel-based single crystals in both the presence and absence of water was carried out in terms of temperature, water molecule distribution, atomic displacement vector, and wear scar depth during the friction process. Finally, the formation process of irregular grinding chips under aqueous conditions was elucidated. The following phenomena were observed: As the number of rubs increased, the single rub depth of the workpiece, the wear rate, and the rate of increase in the number of defective atoms produced all decreased. A comparison of friction under aqueous and water-free conditions showed that, in the presence of water, the force exerted by the grinding ball on the workpiece was shared by the water molecules. This resulted in a decrease in the roughness of the machined surface, a reduction in the number of internally generated layer errors, a lower overall friction temperature, and a nickel matrix that was protected by water molecules. Finally, when grinding under aqueous conditions, water molecules interfered with the normal chip removal process of the grinding balls, leading to the production of irregular grinding chips.

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Coupled heat transfer analysis of internal and film cooling of turbine blade under medium temperature conditions

Cited by 21 publications

References 37 publications

Influence of a Meltblown Die with a Laval Airstream Channel on the Manufacturing Process of a Polymer Fiber Based on an Orthogonal Test and Simulation Analysis

Influence of a Meltblown Die with a Laval Airstream Channel on the Manufacturing Process of a Polymer Fiber Based on an Orthogonal Test and Simulation Analysis

Design of Gas Turbine Cooling System Based on Improved Jumping Spider Optimization Algorithm

Molecular dynamics study of the repetitive friction mechanism of nickel-based single crystals in an aqueous environment

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