Influence of blade vibrations on aerodynamic performance of axial compressor in gas turbine: Direct numerical simulation

Nakhchi, M.E.; Naung, Shine Win; Rahmati, Mohammad

doi:10.1016/j.energy.2021.122988

Cited by 24 publications

(3 citation statements)

References 33 publications

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“…The time dependent values are obtain using the DNS. According to the study of Rahmati et al [45,46], the fluid flow parameters over the vibrating blade with a vibration frequency of (𝜔 = 2𝜋𝑓), can be written as: 𝑄 = 𝑄 + 𝐴 sin(𝜔𝑡) + 𝐵 cos (𝜔𝑡) By using these three algebraic equations, the unknown parameters 𝑄 , 𝐴 and 𝐵 can be evaluated.…”

Section: Aerodynamic Characteristicsmentioning

confidence: 99%

Direct Numerical Simulations of Aerodynamic Performance of Wind Turbine Airfoil by Considering Flap-Wise Blade Oscillations

Toosi

Rahmati

2022

Volume 11: Wind Energy

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Aeroelasticity of modern wind turbines is a critical issue which can significantly affect the structural integrity and lifetime of the wind turbine blades. However, previous aeroelastic or aerodynamic studies were mostly concentrated on low-fidelity numerical methods, and the details of flow separation and vortex generation over wind turbine airfoils cannot be detected with these methods. In this study, a high-fidelity direct numerical model is used to investigate the details of flow separations and laminar separation bubbles (LSB) over a NACA-0012 wind turbine airfoil under oscillation. The simulations are conducted at Reynolds number of Re = 1.3 × 105 and the blade has harmonic pitch-wise oscillations at Mach number of Ma∞ = 0.4. Strong fluctuations are observed in the wake region of the vibrating wind turbine blade. The results show that the blade vibrations have a significant influence on vortex generation and separation point over wind turbine blades. details of flow structure over wind turbine blades compared to previously proposed models.

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Section: Aerodynamic Characteristicsmentioning

confidence: 99%

Direct Numerical Simulations of Aerodynamic Performance of Wind Turbine Airfoil by Considering Flap-Wise Blade Oscillations

Toosi

Rahmati

2022

Volume 11: Wind Energy

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“…As a consequent, researchers commonly use numerical simulation methods to study the particle deposition characteristics in the flue gas turbine cascade. At present, the numerical simulation methods available for the calculation of the turbulent gas-phase flow field are direct numerical simulation (DNS), 6 large eddy simulation (LES) 7 and the Reynolds averaging method (RANS). 8,9 Since Reynolds averaging (RANS) can solve almost all engineering problems in the Reynolds number range with high reliability and few computational resources, it is widely applied to engineering practice.…”

Section: Introductionmentioning

confidence: 99%

Numerical analysis of catalyst particle deposition characteristics in a flue gas turbine with an improved particle motion and deposition model

Cai

Yao

Hou

et al. 2023

Proceedings of the Institution of Mechanical Engineers, Part A:

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To more accurately understand and predict the deposition behavior of catalyst particles in the flue gas turbine cascade, test and numerical combined study is performed in this paper. Based on the systematic analysis of the deposition process and physical mechanism of the catalyst particles, the traditional DRW model, critical velocity particle deposition model and removal model were corrected with the user defined function custom function and validated with the actual deposition morphology. On this basis, the effects of the particle Stokes number and flue gas parameters on the particle deposition characteristics of the flue gas turbine cascade were detailed investigated. The results show that the revised DRW model, critical velocity and removal model can more accurately predict the deposition location and deposition rate of particles in the turbine cascade. With the increase in the Stokes number of particles, the average particle impact rate on the blade surface gradually increased, while the average deposition rate showed a trend of first increasing and then decreasing. The average deposition rate of particles in the rotor blade surface is roughly twice as high as that in the stator surface. With the increase of the flue gas expansion ratio, the deposition rate of particles less than 3 μm gradually increases, while the deposition rate of particles greater than 3 μm tends to decrease. In addition, the change in the flue gas expansion ratio has no obvious effect on the particle deposition distribution in different size ranges.

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“…Win [14] proposed a nonlinear frequent-domain method for solving the vibration of array turbines and found that the distribution characteristics of pressure coefficient and skin friction coefficient on the blade surface of the downstream turbines were significantly affected by the upstream turbine wakes, especially the far wakes. Nakhchi [15] used the spectral-hp element method to directly investigate the flow instability, pressure fluctuation, and vortex generation on the compressor blade surface. The results showed that the blade vibration had a great influence on the vortex generation along the suction side of the blade and the laminar flow separation of the bubbles.…”

Section: Introductionmentioning

confidence: 99%

Flow Characteristics and Energy Loss of a Multistage Centrifugal Pump with Blade-Type Guide Vanes

Zhai

Guo

et al. 2022

JMSE

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Multistage pumps with blade-type guide vanes are widely used in offshore oil production, the petrochemical and coal-chemical industries, and nuclear power fields for its advantages of large flow rate, high pressure, and excellent operation stability. However, the internal flow of this kind of pump is complex; in particular, the hydraulic, flow, and pressure pulsation characteristics of the different stages are quite different, which has a great impact on the design and performance predictions of this kind of pump. Thus, in this paper, the hydraulic performance, unsteady flow characteristics, evolution of vortex structures and pressure pulsation characteristics in a 10 stage centrifugal pump are investigated numerically. The results show that inverse flow, jet-wake flow, and rotor-stator interaction flow are the key factors causing energy loss and efficiency decline at every stage and in the whole pump. The vortex evolution at the rotor–stator interaction regions is actually the process that the vortex structures fall off and impact on the pressure surface at the leading edge of the guide vane blade at a frequency that equals to the impeller blade passing frequency. Furthermore, under the actions of the guide vane with confluence cavity, the pressure pulsation within the final-stage guide vane contains low-frequency components with large bandwidths, which mainly results from the confluence flow disturbance at the outlet of the cylindrical guide passage.

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Influence of blade vibrations on aerodynamic performance of axial compressor in gas turbine: Direct numerical simulation

Cited by 24 publications

References 33 publications

Direct Numerical Simulations of Aerodynamic Performance of Wind Turbine Airfoil by Considering Flap-Wise Blade Oscillations

Direct Numerical Simulations of Aerodynamic Performance of Wind Turbine Airfoil by Considering Flap-Wise Blade Oscillations

Numerical analysis of catalyst particle deposition characteristics in a flue gas turbine with an improved particle motion and deposition model

Flow Characteristics and Energy Loss of a Multistage Centrifugal Pump with Blade-Type Guide Vanes

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