Evaluation and Improvement of Ventilation System Inside Low-Cost Automation Line to Reduce Particle Contamination

Puangburee, Lamai; Busayaporn, Wutthikrai; Kaewbumrung, Mongkol; Thongsri, Jatuporn

doi:10.37936/ecti-eec.2020181.210333

Cited by 5 publications

(4 citation statements)

References 11 publications

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“…For the turbulence equation, the shear stress transport (SST) k-ω turbulence model was chosen, as in [1,[20][21][22][23]. The SST k-ω equation can be written as…”

Section: Aerodynamicsmentioning

confidence: 99%

“…where µ is the molecular dynamics viscosity, P k is the shear production of turbulence, µ t is the eddy viscosity, ω is the specific dissipation rate, k is the turbulent kinetic energy, F 1 is the blending function, and α, β, σ are the specific coefficients for the SST k-ω turbulence model. Further details and definitions of the parameters can be found out in [1,[20][21][22][23]. The ANSYS CFX software can calculate the AD, C l , C d , and pressure, via Equations (1)- (5).…”

Section: Aerodynamicsmentioning

confidence: 99%

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A Proper Shape of the Trailing Edge Modification to Solve a Housing Damage Problem in a Gas Turbine Power Plant

et al. 2021

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To solve the housing damage problem of a fractured compressor blade (CB) caused by an impact on the inner casing of a gas turbine in the seventh stage (from 15 stages), modifications of the trailing edge (TE) of the CB have been proposed, namely 6.5 mm curved cutting and a combination of 4 mm straight cutting with 6.5 mm curved cutting. The simulation results of the modifications in both aerodynamics variables Cl and Cd and the pressure ratio, including structural dynamics such as a normalized power spectrum, frequency, total deformation, equivalent stress, and the safety factor, found that 6.5 mm curved cutting could deliver the aerodynamics and structural dynamics similar to the original CB. This result also overcomes the previous work that proposed 5.0 mm straight cutting. This work also indicates that the operation of a CB gives uneven pressure and temperature, which get higher in the TE area. The slightly modified CB can present the difference in the properties of both the aerodynamics and the structural dynamics. Therefore, any modifications of the TE should be investigated for both properties simultaneously. Finally, the results from this work can be very useful information for the modification of the CB in the housing damage problem of the other rotating types of machinery in a gas turbine power plant.

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“…For the turbulence equation, the shear stress transport (SST) k-ω turbulence model was chosen, as in [1,[20][21][22][23]. The SST k-ω equation can be written as…”

Section: Aerodynamicsmentioning

confidence: 99%

Section: Aerodynamicsmentioning

confidence: 99%

A Proper Shape of the Trailing Edge Modification to Solve a Housing Damage Problem in a Gas Turbine Power Plant

et al. 2021

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“…From the calculation based on the actual conditions at the factory, we found that the Reynolds numbers (Re) were between 5 × 10 3 -2 × 10 5 , which matched the SST k-ω turbulence model. The SST k-ω equations can be written as [6][7][8]12,25,27]:…”

Section: Sst K-ωmentioning

confidence: 99%

“…First, the key is to change the airflow, air change rate, the layout of the machine installation, etc., of the cleanroom [2][3][4] and wear the proper uniform of operators [5]. For the latter, the solution can be obtained by changing the conditions of the air circulation system, especially in the machines [6], installing the fan filter unit [7], modifying the hood's shape [8,9], and adding the cleaning process [10][11][12]. In brief, the global and local exhaust ventilations consist of three main components: suction head or hood, duct, and vacuum pump.…”

Section: Introductionmentioning

confidence: 99%

A Suitable Shape of the Suction Head for a Cleaning Process in a Factory Developed by Computational Fluid Dynamics

2021

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The previous shape of the suction head (SH) employed in a cleaning process in a factory had a low performance, removed fewer particles, and generated an annoying noise. Therefore, new shapes of SH have been proposed to solve the issues and the cleaning performance was investigated by the Shear Stress Transport (SST) k-ω turbulence, Discrete Phase (DP), Large Eddy Simulation (LES), and Ffowcs Williams and Hawkings (FW–H) models in a transient state of computational fluid dynamics (CFD). The SST k-ω and DP models were applied to determine the airflow, suspension velocity, cleaning region, and particle trace. In addition, the LES and FW–H models were used to evaluate the noise, sound pressure level, and frequency generated from the proposed shapes. All simulation results were validated with the air velocity and noise measurements and were analyzed to find a suitable shape. The simulation and experimental results revealed that the shapes of the SH affected the cleaning performance and noise generation. The higher the air velocity, the higher the noise generation. The suitable shape delivered a 4.37% better particle removing performance and 11.1 dB less noise generation than the previous shape. The outcomes of this research are the suitable shape of the SH and the research methodology which enabled the application of both CFD and experiments to solve the issue to help enhance the efficiency of the cleaning process in an actual factory.

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Gas Flow and Ablation of 122 mm Supersonic Rocket Nozzle Investigated by Conjugate Heat Transfer Analysis

Thongsri

Srathonghuam

Boonpan³

2022

Processes

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The propellant gas flow of a supersonic rocket in inappropriate operating conditions can cause excessive ablation inside a nozzle. In this research, conjugate heat transfer analysis (CHTA), consisting of computational fluid dynamics (CFD) and finite element analysis (FEA), was applied to investigate the gas flow and ablation of a 122 mm nozzle as a case study in the transient state, based on actual operating conditions. First, the nozzle was tested in a static experiment. Then, the experimental results were employed for CHTA settings and validation. Next, after completing the CFD calculation, the results revealed that the nozzle’s gas flow, temperature, pressure, Mach number, shock, etc. were consistent with theoretical results. Finally, using the CFD results as loads, the FEA results showed the equivalent von Mises stress (sv), which was consistent with the ablation results from the experiment, as expected. The more the sv, the greater the ablation. Both sv and ablation were high near the throat and decreased further away. In addition, increasing the insulators’ thickness reduced sv, leading to ablation reduction. The research findings contribute to an understanding of ablation and the methodology of employing CHTA to improve the design of 122 mm and other nozzles with reduced ablation for higher efficacy.

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Evaluation and Improvement of Ventilation System Inside Low-Cost Automation Line to Reduce Particle Contamination

Cited by 5 publications

References 11 publications

A Proper Shape of the Trailing Edge Modification to Solve a Housing Damage Problem in a Gas Turbine Power Plant

A Proper Shape of the Trailing Edge Modification to Solve a Housing Damage Problem in a Gas Turbine Power Plant

A Suitable Shape of the Suction Head for a Cleaning Process in a Factory Developed by Computational Fluid Dynamics

Gas Flow and Ablation of 122 mm Supersonic Rocket Nozzle Investigated by Conjugate Heat Transfer Analysis

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