A Numerical Study of the Turbulent Flow Characteristics in the Inlet Transition Square Duct Based on Roof Configuration

Yoo, Geun Jong; Choi, Heekyu; Choi, Kee Lim; Shin, Byeong Ju

doi:10.3795/ksme-b.2009.33.7.541

Cited by 6 publications

(6 citation statements)

References 5 publications

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“…Although it is usually impossible to get Reynolds similarity exactly between the prototype and the model, it is well known that the turbulent flow pattern does not change any more by increasing the Reynolds number larger than 1×10 4 [7]. In this experimental condition of maximum flow, the Reynolds number is in the range of 1.2~6.1×10 5 and this means that Reynolds similarity is relatively well kept in this experiment. In addition, considering the swirl behavior in the real gas flow through the HRSG, a swirler is attached at the entrance of the model.…”

Section: Cold Flow Wind Tunnel Testsmentioning

confidence: 75%

“…The pressure drop was calculated as source term added in the momentum equation [13]. Number of Transfer Unit (NTU) model was used to calculate the heat transfer in the tube zone and the fan swirl velocity modelling was employed to express the swirl flow from the gas turbine [5]. Inlet conditions of the exhaust gas were summarized in Table 5 and input values to express the pressure and temperature drop at the tube zone were decided based on data of the pressure and temperature in the Ulsan combined cycle power plant unit 2 as shown in Table 6[3].…”

Section: Cfd Simulationmentioning

confidence: 99%

“…They found that the flow correction devices made the flow entering the duct burner more uniform and the flow uniformity was not affected by the intensity of swirl when the flow correction device was in place. Yoo et al [5] considered the change of inlet duct shape for the improved uniform flow and showed its possibility. Chong and Song [6] concluded that the non-uniform flow on heat exchange tube leads to lower system efficiency.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Investigation of the Flow Pattern in a Complex Inlet Duct of a Heat Recovery Steam Generator

Shin¹,

Kim²,

Ahn³

et al. 2012

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Numerical simulation and experimental study were conducted in order to analyze flow patterns and finally to find out appropriate alternatives for uniform flow in the transition zone of the vertical type Heat Recovery Steam Generator (HRSG) for a gas turbine combined cycle. To understand flow patterns in the interconnecting duct between the gas turbine exhaust and the inlet of the HRSG, flow measurement was conducted in a 1/20 scale-down model. Velocities were measured by pitot tubes on selected sections and uniformity of the flow was quantitatively evaluated. Water table test was also carried out to visualize the flow and to compare the flow patterns according to the selection of alternative shape design of the transition zone, which would lead to better uniformity of the flow in the duct. Numerical simulation by a commercial Computational Fluid Dynamics (CFD) code was performed to augment the model tests and to consider various ideas for better uniformity. Finally, selected alternatives for the uniform flow chosen from the numerical study were checked against in experiments.

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Section: Cold Flow Wind Tunnel Testsmentioning

confidence: 75%

Section: Cfd Simulationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Investigation of the Flow Pattern in a Complex Inlet Duct of a Heat Recovery Steam Generator

Shin¹,

Kim²,

Ahn³

et al. 2012

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“…Nu mber of Transfer Un it (NTU) model was used to calculate the heat transfer in the tube zone. Fan swirl velocity modelling was employed to express the swirl flow fro m the gas turbine [19]. Heat transfer fro m the hot gas to the wall is described by convective heat transfer.…”

Section: Cfd Modelmentioning

confidence: 99%

Thermal Stress Analysis in Structural Elements of HRSG Casing

Shin¹,

Kim²,

Ahn³

et al. 2012

IJEE

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Heat recovery steam generators (HRSGs) are arranged at the tail end of gas turbines in co mb ined cycle power plants (CCPPs), and are designed to withstand the hot gas environment approaching 600℃. In addition to higher thermal to power efficiency, CCPPs show superior response characteristics compared to those of other conventional steam power plants. For that reason, frequent load changes on the system, which so metimes include daily start and stop (DSS) operation, would impose additional burden on the structural elements. The main objective o f this work is to analy ze the thermal stress conditions as related to the observed failure on the structural elements of HRSG casing, and to find root causes of failure of mechanical integrity. To achieve this goal, field measurements were performed to record temperatures of wall and stiffener of the casing fro m a real plant in operation. To consider the effect of hot gas on the casing, computational fluid dynamic (CFD) analysis of gas flow inside the HRSG with appropriate wall conditions using FLUENT V12. Thermal stress analysis on the thin wall of the casing and stiffeners of HRSG was conducted with the temperature data from the CFD results, using ANSYS Workbench V12. Su mmarizing the computational results, some limited ideas were presented which would be useful to prevent damages.

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“…Yoo et al [13] considered the change of inlet duct shape for the improved uniform flow and showed its possibility. Ameri and Jazini [14] considered the CFD modeling of heat recovery steam generator inlet duct.…”

Section: Introductionmentioning

confidence: 99%

Experimental and numerical investigation of optimum design of semi industrial heat recovery steam generator inlet duct

Hanafizadeh

Ahmadi

2016

Applied Thermal Engineering

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A Numerical Study of the Turbulent Flow Characteristics in the Inlet Transition Square Duct Based on Roof Configuration

Cited by 6 publications

References 5 publications

Investigation of the Flow Pattern in a Complex Inlet Duct of a Heat Recovery Steam Generator

Investigation of the Flow Pattern in a Complex Inlet Duct of a Heat Recovery Steam Generator

Thermal Stress Analysis in Structural Elements of HRSG Casing

Experimental and numerical investigation of optimum design of semi industrial heat recovery steam generator inlet duct

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