Size effect on the flame base locations after V-gutters for premixed flames

Gong, Fan; Huang, Yong; Huang, Xiaoli

doi:10.1016/j.ijheatmasstransfer.2014.11.031

Cited by 11 publications

(5 citation statements)

References 17 publications

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“…Size effect on flame base locations after V-gutters for premixed flames [17] showed that as the inlet velocity increases, the flame bases move upstream, while the re-circulation zone extends downstream.…”

Section: Introductionmentioning

confidence: 99%

Experimental investigation of distance between v-gutters on flame stabilization and NOx emissions

et al. 2019

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Blow-off performance and NO x emissions of the propane and air mixture in a rectangular combustion chamber with bluff bodies were investigated experimentally and numerically. The effects of distance between bluff bodies on NO x emissions, the blow-off limit, and exhaust gas temperature were examined. It was observed that NO x emissions are highly dependent on distance between V-gutters. The re-circulation zone behind the bluff body expands in width based on the decrease of distance between V-gutters, and expands in length with the increase of inlet velocity. The temperature fields behind the bluff body show a similar change, the temperature behind the bluff body reaches its highest when the distance between V-gutters reaches 20 mm, meaning it has better flame stability. The blow-off limit is significantly improved with the decrease of distance between V-gutters. The blow-off limit is greatly improved by reducing the distance between the V-gutters. Maximum blow-off limit of 0.

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Section: Introductionmentioning

confidence: 99%

Experimental investigation of distance between v-gutters on flame stabilization and NOx emissions

et al. 2019

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“…3 Outside Europe, efforts to reproduce a more detailed description of cross-country gradients of corruption tolerance could be found only in the third round of the Afrobarometer (2005). 4 When it comes to effective comparison, studies have adopted mainly few available items (everyday situations to be characterized as justifiable or not, such as 'avoiding a fare on public transport' or 'someone accepting a bribe in the course of their duties') from the World Values Survey/European Values Study (WVS/EVS) as a proxy for TtC (Catterberg & Moreno, 2005;Gatti et al, 2003;Keller & Sik, 2009;Lavena, 2013;Malmberg, 2019;Moreno, 2002;Pisor & Gurven, 2015;Pop, 2012) or opted for other pre-existent questions that could somehow represent it (Chang & Huang, 2016;Chang & Kerr, 2017), with particular reference to the EB approach, i.e. the Index of Tolerance to Corruption composed of three conducts related to public-private interactions that may be seen as corrupt (if it is acceptable to give money, to give a gift, or to do a favor to get something from the public administration or a public service) created by the European Commission (2014).…”

Section: State Of the Artmentioning

confidence: 99%

“…EVS data has been used to measure TtC since Moreno's (2002) work and remains being used with few criticism until today. Even others that apply different operationalizations do not develop an argument in favor of the measure created or/and highlight limitations found in the EVS approach (Chang & Huang, 2016;Chang & Kerr, 2017;Guo & Tu, 2017;Hunady, 2017;Ko et al, 2012;Pozsgai-Alvarez, 2014, 2015Sautu, 2002). Malmberg (2019, p. 117) was the first to shed some light on the unrestricted adoption of the EVS approach, indicating that if we disregard the 'accepting a bribe in the course of their duties' item of the EVS TtC proxy, the other items "are not considered to be acts of corruption in the strict modern sense of the word".…”

Section: What Do the Available Ttc Indicators In Fact Represent And Measure? (Q1)mentioning

confidence: 99%

What We (Don't) Know so Far About Tolerance Towards Corruption in European Democracies: Measurement Approaches, Determinants, and Types

Maciel

2021

Soc Indic Res

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Cross-national survey data shows that for a significant share of European citizens, corruption is acceptable. Notwithstanding the importance of prior knowledge on corruption extension and experience, research has made little progress in exploring why people condone it, especially in unsuspicious countries, with effective institutions and stable democratic rules and processes. The present study examines this gap in the literature by assessing the European Values Study (EVS) and the Special Eurobarometer (EB) attempts at measuring ‘Tolerance towards Corruption’ (TtC) in OECD countries in Europe during the same period (2017–2019). In the end, measurements proved to be constrained by the limited number of questions/items that try to capture TtC, which gave room to conclude that: (a) EVS and EB approaches do not measure the same TtC. The first measures it through social transgressions not exclusively related to corruption, while the second measures the willingness to accept a public-office corruption when dealing with the public sphere. (b) Lower ages combined with individual preferences/perceptions of less satisfaction with life, widespread corruption, and prior experiences with corruption proved to be more relevant to explain TtC, regardless of the country in which individuals were surveyed. (c) The type of TtC citizens display in advanced democracies proved to be mainly contingent on their age and on the way they interpret the extension of corruption and the prior contact they had with a public-office corruption in a given society. Supplementary Information The online version contains supplementary material available at 10.1007/s11205-021-02690-y.

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“…13–17 Also, numerical simulation of flame propagation and stability had been done via large eddy simulation using global and skeletal reaction mechanisms. 18–22 Moreover, exhaust emissions and combustion efficiency are key indexes for combustion organization. Plenty of experiments had been conducted to investigate the effect of bluff body in steady and unsteady combustion.…”

Section: Introductionmentioning

confidence: 99%

“…In addition to flame propagation and stability issues, planar laser induced fluorescence technique and ICCD camera were used to obtain simultaneous imaging of hydroxyl and formaldehyde, as well as the flame spreading process [13][14][15][16][17]. Also, numerical simulation of flame propagation and stability had been done via large eddy simulation using global and skeletal reaction mechanisms [18][19][20][21][22]. Moreover, exhaust emissions and combustion efficiency are key indexes for combustion organization.…”

Section: Introductionmentioning

confidence: 99%

Influence of parameters on flame expansion in a high-speed flow: Experimental and numerical study

Zhao

Fan

Zhang

2019

Proceedings of the Institution of Mechanical Engineers, Part A:

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Flameholder-stabilized flames are conventional and also commonly used in propulsion and various power generation fields to maintain combustion process. The characteristics of flame expansion were obtained with various blockage ratios, which were observed to be highly sensitive to inlet conditions such as temperatures and velocities. Experiments and simulations combined methodology was performed; also the approach adopted on image processing was calculated automatically through a program written in MATLAB. It was found that the change of flame expansion angle indicated increasing fuel supply could contribute to the growth of flame expansion angle in lean premixed combustion. Besides, the influence of inlet velocity on flame expansion angle varies with different blockage ratios, i.e. under a small blockage ratio (BR = 0.1), flame expansion angle declined with the increase of velocity; however, under a larger blockage ratio (BR = 0.2 or 0.3), flame expansion angle increased firstly and then decreased with the increasing velocity. Likewise, flame expansion angle increased firstly and then decreased with the increasing temperature under BR = 0.2/0.3. In addition, flame expansion angle was almost the same for BR = 0.2 and BR = 0.3 at a higher temperature (900 K), and both of which were bigger than BR = 0.1. Overall, BR = 0.2 is the best for increasing flame expansion angle and reducing total pressure loss. The influence of velocity and temperature on flame expansion angle found from this research are vital for engineering practice and for developing a further image processing method to measure flame boundary.

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Size effect on the flame base locations after V-gutters for premixed flames

Cited by 11 publications

References 17 publications

Experimental investigation of distance between v-gutters on flame stabilization and NOx emissions

Experimental investigation of distance between v-gutters on flame stabilization and NOx emissions

What We (Don't) Know so Far About Tolerance Towards Corruption in European Democracies: Measurement Approaches, Determinants, and Types

Influence of parameters on flame expansion in a high-speed flow: Experimental and numerical study

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