Numerical simulation of transitional flows with heat transfer

Kožíšek, Martin; Příhoda, Jaromír; Fürst, Jiří; Straka, Petr

doi:10.1063/1.4953723

Cited by 1 publication

(1 citation statement)

References 7 publications

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“…The k-ε model and the k-ω model are two-equation eddy viscosity models widely used for incompressible and compressible flow close to the wall, and the accuracy and stability of the Transition-SST model in the near-wall region is superior to the standard k-ω model. The three-equation Transition k-kl-ω model based on the standard k-ω model is applicable to wall-constrained and jet flow, as the effect of disturbance to the Reynolds stress is added into this model [23].…”

Section: Turbulence Model and Boundary Conditionsmentioning

confidence: 99%

Experimental and Numerical Investigations on the Local Direct Leakage Process of Rotary Regenerative Air Preheater

Zhu

et al. 2020

Applied Sciences

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An inherent defect of the operating rotary air preheaters (RAPH) is known as leakage, which seriously hinders the efficient and safe operation of RAPH. It is significant for the estimation of the direct leakage to determine the effects of different structure parameters of sealing sheets and different operation parameters of a RAPH. A direct leakage set-up was built and a three-dimensional numerical model was established to explore the local direct air leaking process of rotary regenerative air preheater and study the effects of geometrical and operational parameters on the leakage. The numerical simulation using the transition k-kl-ω turbulence model was verified by the experimental results. The results show that the local direct air leakage mainly depends on the total pressure difference between the two sides of the seal instead of the one-side pressure. The air leakage can be significantly reduced by narrowing the leakage gap. The increase in the number of sealing sheets can reduce the air leakage own to the increase in the leakage resistance. The increase in the spacing between the adjacent sealing sheets can enlarge the recirculation zone and increase the energy loss of mainstream, greatly reducing the local direct air leakage. Due to the different size recirculation zone formation and streamline curvature induced by sealing sheet, the effect of bending angle on the direct air leakage varies. To obtain lower leakage rate, it is recommended for the rotor of tri-sectional air preheater to pass through flue gas section, secondary-air section, and primary-air section in sequence.

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Section: Turbulence Model and Boundary Conditionsmentioning

confidence: 99%

Experimental and Numerical Investigations on the Local Direct Leakage Process of Rotary Regenerative Air Preheater

Zhu

et al. 2020

Applied Sciences

View full text Add to dashboard Cite

show abstract

Numerical simulation of transitional flows with heat transfer

Cited by 1 publication

References 7 publications

Experimental and Numerical Investigations on the Local Direct Leakage Process of Rotary Regenerative Air Preheater

Experimental and Numerical Investigations on the Local Direct Leakage Process of Rotary Regenerative Air Preheater

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