Reconstruction and Editing of Dynamic Flame Temperature Field

2016 ◽  
Author(s):  
Wu Zhaohui ◽  
Wu Xiaobo ◽  
Zhang Linbo ◽  
Wang Feng
Keyword(s):  
Temperature Field ◽  
Flame Temperature

scholarly journals An analytical study of the effects of vaporization of twodimensional laminar droplets on a triple flame

2011 ◽  
Vol 76 (11) ◽  
pp. 1567-1581 ◽  
Author(s):  
Mehdi Bidabadi ◽  
Ghazal Barari ◽  
Milad Azimi
Keyword(s):  
Temperature Field ◽  
Vertical Velocity ◽  
Flame Temperature ◽  
Lewis Number ◽  
Field Equations ◽  
Irreversible Reaction ◽  
Fuel Droplets ◽  
First Case ◽  
Energy Equations ◽  
Fuel Stream

The structure of triple flame propagation in combustion systems, containing uniformly distributed volatile fuel droplet was analyzed. The analysis was established for a one-step irreversible reaction with an asymptotic limit, where the value of the Zeldovich Number is large. Here, using unit Lewis number, the analytical results for the triple flame temperature were obtained considering two sections. In the first section, a non-vaporizing fuel stream was studied and in the second section, a volatile droplet fuel stream was taken into account. It is presumed that the fuel droplets vaporize to yield a gaseous fuel of known chemical structure, which is subsequently oxidized in the gaseous phase. Here two different cases are studied. In the first case, only the velocity parallel to the reactant flow was considered; while for the latter one, the vertical velocity was considered in addition. The energy equations were solved and the temperature field equations are presented. The results are first presented for a non-vaporizing fuel and compared to the experiment results. In addition, some other results of the temperature field for a vaporizing fuel stream are demonstrated within the comparison between the abovementioned cases which revealed the effect of the considering the vertical velocity component on the flame temperature field.

scholarly journals Research on tomography algorithm of furnace flame temperature field based on acoustic method in thermal power station

2021 ◽  
Vol 2121 (1) ◽  
pp. 012009
Author(s):  
Zhe Kan ◽  
Shuqiang Ding ◽  
Xiaolei Wang
Keyword(s):  
Temperature Field ◽  
Standard Deviation ◽  
Tikhonov Regularization ◽  
Power Plants ◽  
Thermal Power ◽  
Flame Temperature ◽  
Singular Values ◽  
Singular Value ◽  
Loop Control ◽  
Regularization Matrix

Abstract An improved Tikhonov regularization algorithm MCTR based on Markov radial basis function is proposed to obtain the feedback of closed-loop control for pulverized coal injection process in thermal power plant, so as to solve the ill posed problem in temperature field reconstruction in furnace. The algorithm constructs a new regularization matrix to replace the standard Tikhonov regularization element matrix, so as to achieve the correction effect of the new algorithm. MCTR algorithm determines the boundary singular value of small singular value defined in this paper by determining the proportion between the standard deviation component corresponding to small singular value and the sum of standard deviation components corresponding to all singular values after singular value decomposition of coefficient matrix. After determining the boundary, a new regularization matrix is constructed according to the eigenvector corresponding to small singular value. Compared with the MTR algorithm using the identity matrix as the regularization matrix, MCTR algorithm only selectively modifies the parameters corresponding to small singular values after determining the regularization parameters, which improves the stability of the parameter solution and the reconstruction accuracy of the temperature field, and is helpful to the automatic control of thermal power plants and the efficiency of coal combustion.

scholarly journals Reconstruction of Flame Local Temperature Field Using Tomographic Approach by Spectral Ratio Pyrometer

2019 ◽  
Author(s):  
Вячеслав Фланден ◽  
Vyacheslav Flanden ◽  
Антон Поройков ◽  
Anton Poroykov ◽  
Дмитрий Голенцов ◽  
...  
Keyword(s):  
Temperature Field ◽  
Signal Amplification ◽  
Flame Temperature ◽  
Spectral Ratio ◽  
Temperature Fields ◽  
Line Of Sight ◽  
Inverse Transformation ◽  
Transimpedance Amplifier ◽  
Interference Filters ◽  
Spectral Ranges

The paper presents an approach to the reconstruction of the flame temperature field using a spectral ratio pyrometer. The device registers the intensity of the radiation from the measured flame in several spectral ranges using interference filters and photodiodes. Signal amplification occurs using the developed transimpedance amplifier. The pyrometer determines the temperature by measuring the ratio of the radiation intensity in two different spectral ranges. The signal is determined by integrating the intensity of the flame radiation along the optical system line of sight. Measurement of flame from several angles allows to get the Radon transform for this area. Calculation of the inverse transformation allows to obtain the field of local flame temperatures. The work presents an experimental setup for measuring flame local temperatures and software that allows to automate the measurement process and restore tomograms of temperature fields.

scholarly journals Experimental study of a laminar premixed LFG/air flame in a slot burner using Mach-Zehnder interferometry

2016 ◽  
Vol 20 (5) ◽  
pp. 1649-1660 ◽  
Author(s):  
Ashrafi Najafian ◽  
Mehdi Ashjaee
Keyword(s):  
Experimental Study ◽  
Reynolds Number ◽  
Temperature Field ◽  
Equivalence Ratio ◽  
Volume Fraction ◽  
Flame Temperature ◽  
Flame Height ◽  
Effect Of Temperature ◽  
Noticeable Effect ◽  
Present Measurement

An experimental study was conducted to investigate the influence of Reynolds number and equivalence ratio on flame temperature field and thermal flame height of laminar premixed LFG fuel. Mach-Zehnder interferometry technique is used to obtain an insight to the overall temperature field. The slot burner with large aspect ratio (L/W), length of L=60 mm and width of W=6 mm was used to eliminate the three- dimensional effect of temperature field. Two kinds of mixed fuels, LFG70 (70%CH4- 30%CO2 on volume basis) and LFG50 (50%CH4- 50%CO2) were used to investigate flame characteristics under the test conditions of 100 ? Re ? 600 and 0.7 ? ? ? 1.3. The present measurement reveals that the variation of maximum flame temperature with increment of Reynolds number is mainly due to heat transfer effects and is negligible. On the other hand, the equivalence ratio and fuel composition have a noticeable effect on flame temperature. In addition, the results show that the LFG flames compared to the CH4 ones have a lower flame temperature. With increment of CO2 volume fraction at lean combustion, thermal flame height is augmented while at stoichiometric and rich combustion, its value reduced. Thermal flame height augments linearly by Reynolds number increase, while its increment at rich mixture is higher and the effect of Reynolds number at lean mixtures is insignificant. For validation of experimental results from Mach-Zehnder Interferometry, K-type thermocouples are used at peripherally low and moderate isotherm lines.

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