Experimental investigations on visualization of three-dimensional temperature distributions in a large-scale pulverized-coal-fired boiler furnace

2005 ◽  
Vol 30 (1) ◽  
pp. 1699-1706 ◽  
Author(s):  
Huai-Chun Zhou ◽  
Chun Lou ◽  
Qiang Cheng ◽  
Zhiwei Jiang ◽  
Jin He ◽  
...  
Keyword(s):  
Large Scale ◽  
Three Dimensional ◽  
Pulverized Coal ◽  
Experimental Investigations ◽  
Boiler Furnace ◽  
Temperature Distributions

LES of Pulverized Coal Combustion Furnaces

2011 ◽  
Author(s):  
Kenji Yamamoto ◽  
Daisuke Kina ◽  
Teruyuki Okazaki ◽  
Masayuki Taniguchi ◽  
Hirofumi Okazaki ◽  
...  
Keyword(s):  
Feed Rate ◽  
Large Scale ◽  
Pulverized Coal ◽  
Unburned Carbon ◽  
Calculation Error ◽  
Boiler Furnace ◽  
Jet Flame ◽  
Eddy Simulation ◽  
Large Eddy ◽  
Lift Off

LES (large eddy simulation) is applied to combustion simulations of two large scale pulverized coal-fired furnaces. One application is a boiler furnace with the coal feed rate of 3,000 kg/h. The results of LES show good agreement in not only distributions of temperature, NO concentration, and CO concentration on the vertical center line but also NO and CO emissions and UBC (unburned carbon in ash). The calculation error of NO emission is 10%. The other application is a horizontal furnace with a low NOx burner with the coal feed rate of 560 kg/h. LES predicts temperatures and oxygen concentrations accurately; but the standard k-ε model does not. The flame width calculated by the standard k-ε model is narrower than that by LES. These calculated results indicate that the drawback of the standard k-ε model is its low calculation accuracy for the coal jet flame decay and lift-off height.

Numerical Simulation of Three-Dimensional Temperature Distribution in the Supercharged Boiler Furnace

2011 ◽  
Vol 328-330 ◽  
pp. 327-331 ◽  
Author(s):  
Zhong Gen Li ◽  
Guo Yi Zhou
Keyword(s):  
Three Dimensional ◽  
Color Temperature ◽  
Radiative Energy ◽  
Boiler Furnace ◽  
Scaled Model ◽  
Charge Coupled Device ◽  
Temperature Distributions ◽  
The Monte Carlo Method ◽  
Reconstruction Quality ◽  
The One

In this paper, the visualization of three-dimensional (3-D) temperature distributions in the supercharged boiler furnaces from radiative energy images captured by multiple charge-coupled device (CCD) cameras mounted around the furnace is studied numerically for the first time. The combustion of supercharged boiler is analyzed by structuring a full-scaled model and grid partition. The calculation of the radiative energy image formation is a fast algorithm based on the Monte Carlo method and the two-color temperature calculation method. For the inversion of the 3-D temperature distributions, a modifiedregularization method is used. The simulation results show that: even though the measurement error of the radiative energy images for the 3-D temperature distributions up to 0.12, the position of the reconstruction high-temperature zone is almost the same to the one of the simulation. The results indicate that the reconstruction quality is satisfactory, and the method can lead to a good visualization result.

Experimental Investigations on Three-Dimensional Blading Optimization for Low-Speed Model Testing

2016 ◽  
Vol 138 (12) ◽  
Author(s):  
Chenkai Zhang ◽  
Jun Hu ◽  
Zhiqiang Wang ◽  
Jun Li
Keyword(s):  
Large Scale ◽  
Three Dimensional ◽  
Pressure Rise ◽  
Optimization Procedure ◽  
Model Testing ◽  
Experimental Results ◽  
Experimental Investigations ◽  
Flow Mechanism ◽  
Forward Movement ◽  
Low Speed

Low-speed model testing (LSMT) plays a key role in advanced multistage high-pressure compressor (HPC) design recently, due to this, employing low-speed large-scale compressor to conduct 3D blading design and detailed flow mechanism investigation is convenient and cost-saving. This paper is one portion of a whole LSMT project for the seventh stage of an advanced commercial HPC, and experimental investigations of 3D blading optimizations for LSMT were presented in this paper, consisting of overall performances for the compressor and stage 3 and detailed flowfield measurements including area traverse for rotor 3 inlet, stator 3 inlet and outlet, area traverse inside stator 3 passage, and static pressure on stator 3 blade surface. Compared with the datum compressor, revised rotor 3 is J-type and hub restaggered, and the improved stator 3 possesses characteristics of controlled camber angle, reduced leading blade angle, forward movement of maximum thickness position, and larger bowed-shape. Experimental results show that efficiency is improved by 1%, and total pressure rise for the compressor and the third stage is raised by 1.4% and 10%, respectively, while the stalling mass flow rate is maintained. The effectiveness of improved design methods is confirmed, and it is a guide for further blading design and optimization, furthermore, detailed flowfield measurements reveal the basic flow mechanism of all the improvement methods. Moreover, the results indicate that utilization of cfd code in the optimization procedure is promising, and the reliability and feasibility of cfd code are verified with the detailed experimental results.

Phase-Locked Investigation of Secondary Flows Perturbed by Passing Wakes in a High-Lift LPT Turbine Cascade

2015 ◽  
Author(s):  
Daniele Infantino ◽  
Francesca Satta ◽  
Daniele Simoni ◽  
Marina Ubaldi ◽  
Pietro Zunino ◽  
...  
Keyword(s):  
Large Scale ◽  
Three Dimensional ◽  
Secondary Flows ◽  
Experimental Investigations ◽  
Turbine Cascade ◽  
Ensemble Averaging ◽  
Tangential Plane ◽  
Mean Velocity ◽  
High Lift ◽  
Passage Vortex

The present work describes the experimental investigations carried out at the Aerodynamics and Turbomachinery Laboratory of Genoa University aimed at characterizing the unsteady features of the secondary flows in a High-Lift Low Pressure Turbine cascade perturbed by incoming wakes. The investigations have been carried out at the nominal exit flow Reynolds number of 300000 in a 5-blade large-scale linear cascade. Hot-wire phase-locked ensemble-averaging technique has been applied to analyze in depth the time-dependent velocity and turbulence intensity distributions in a downstream tangential plane during a wake period. A multiple rotation technique has been used in order to measure the three velocity components as well as the Reynolds stress tensor terms. Acquired data are presented in terms of the phase-dependent mean velocity, turbulence and vorticity maps in order to distinguish between the contributions due to incoming wake velocity defect and those due to the turbulence carried by wakes on the phase-dependent secondary flow structures. Results clearly highlight a significant distortion and weakening of the passage vortex when the upstream wake passes through the measuring domain. Also an evident displacement of the passage vortex position has been observed in the wake period. This analysis allows understanding the difference in the three dimensional time mean structures of the exit flow field between the steady and unsteady operations.

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