Combustion and Flame

The mission of the journal is to publish high quality work from experimental, theoretical, and computational investigations on the fundamentals of combustion phenomena and closely allied matters. While submissions in all pertinent areas are welcomed, past and recent focus of the journal has been on: Development and validation of reaction kinetics, reduction of reaction mechanisms and modeling of combustion systems, including: Conventional, alternative and surrogate fuels; Pollutants; Particulate and aerosol formation and abatement; Heterogeneous processes. Experimental, theoretical, and computational studies of laminar and turbulent combustion phenomena, including: Premixed and non-premixed flames; Ignition and extinction phenomena; Flame propagation; Flame structure; Instabilities and swirl; Flame spread; Multi-phase reactants. Advances in diagnostic and computational methods in combustion, including: Measurement and simulation of scalar and vector properties; Novel techniques; State-of-the art applications. Fundamental investigations of combustion technologies and systems, including: Internal combustion engines; Gas turbines; Small- and large-scale stationary combustion and power generation; Catalytic combustion; Combustion synthesis; Combustion under extreme conditions; New concepts.

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Quartiles

The set of journals have been ranked according to their SJR and divided into four equal groups, four quartiles. Q1 (green) comprises the quarter of the journals with the highest values, Q2 (yellow) the second highest values, Q3 (orange) the third highest values and Q4 (red) the lowest values.

Category	Year	Quartile
Chemical Engineering (miscellaneous)	1999	Q1
Chemical Engineering (miscellaneous)	2000	Q1
Chemical Engineering (miscellaneous)	2001	Q1
Chemical Engineering (miscellaneous)	2002	Q1
Chemical Engineering (miscellaneous)	2003	Q1
Chemical Engineering (miscellaneous)	2004	Q1
Chemical Engineering (miscellaneous)	2005	Q1
Chemical Engineering (miscellaneous)	2006	Q1
Chemical Engineering (miscellaneous)	2007	Q1
Chemical Engineering (miscellaneous)	2008	Q1
Chemical Engineering (miscellaneous)	2009	Q1
Chemical Engineering (miscellaneous)	2010	Q1
Chemical Engineering (miscellaneous)	2011	Q1
Chemical Engineering (miscellaneous)	2012	Q1
Chemical Engineering (miscellaneous)	2013	Q1
Chemical Engineering (miscellaneous)	2014	Q1
Chemical Engineering (miscellaneous)	2015	Q1
Chemical Engineering (miscellaneous)	2016	Q1
Chemical Engineering (miscellaneous)	2017	Q1
Chemical Engineering (miscellaneous)	2018	Q1
Chemical Engineering (miscellaneous)	2019	Q1
Chemical Engineering (miscellaneous)	2020	Q1
Chemical Engineering (miscellaneous)	2021	Q1
Chemistry (miscellaneous)	1999	Q1
Chemistry (miscellaneous)	2000	Q1
Chemistry (miscellaneous)	2001	Q1
Chemistry (miscellaneous)	2002	Q1
Chemistry (miscellaneous)	2003	Q1
Chemistry (miscellaneous)	2004	Q1
Chemistry (miscellaneous)	2005	Q1
Chemistry (miscellaneous)	2006	Q1
Chemistry (miscellaneous)	2007	Q1
Chemistry (miscellaneous)	2008	Q1
Chemistry (miscellaneous)	2009	Q1
Chemistry (miscellaneous)	2010	Q1
Chemistry (miscellaneous)	2011	Q1
Chemistry (miscellaneous)	2012	Q1
Chemistry (miscellaneous)	2013	Q1
Chemistry (miscellaneous)	2014	Q1
Chemistry (miscellaneous)	2015	Q1
Chemistry (miscellaneous)	2016	Q1
Chemistry (miscellaneous)	2017	Q1
Chemistry (miscellaneous)	2018	Q1
Chemistry (miscellaneous)	2019	Q1
Chemistry (miscellaneous)	2020	Q1
Chemistry (miscellaneous)	2021	Q1
Energy Engineering and Power Technology	1999	Q1
Energy Engineering and Power Technology	2000	Q1
Energy Engineering and Power Technology	2001	Q1
Energy Engineering and Power Technology	2002	Q1
Energy Engineering and Power Technology	2003	Q1
Energy Engineering and Power Technology	2004	Q1
Energy Engineering and Power Technology	2005	Q1
Energy Engineering and Power Technology	2006	Q1
Energy Engineering and Power Technology	2007	Q1
Energy Engineering and Power Technology	2008	Q1
Energy Engineering and Power Technology	2009	Q1
Energy Engineering and Power Technology	2010	Q1
Energy Engineering and Power Technology	2011	Q1
Energy Engineering and Power Technology	2012	Q1
Energy Engineering and Power Technology	2013	Q1
Energy Engineering and Power Technology	2014	Q1
Energy Engineering and Power Technology	2015	Q1
Energy Engineering and Power Technology	2016	Q1
Energy Engineering and Power Technology	2017	Q1
Energy Engineering and Power Technology	2018	Q1
Energy Engineering and Power Technology	2019	Q1
Energy Engineering and Power Technology	2020	Q1
Energy Engineering and Power Technology	2021	Q1
Fuel Technology	1999	Q1
Fuel Technology	2000	Q1
Fuel Technology	2001	Q1
Fuel Technology	2002	Q1
Fuel Technology	2003	Q1
Fuel Technology	2004	Q1
Fuel Technology	2005	Q1
Fuel Technology	2006	Q1
Fuel Technology	2007	Q1
Fuel Technology	2008	Q1
Fuel Technology	2009	Q1
Fuel Technology	2010	Q1
Fuel Technology	2011	Q1
Fuel Technology	2012	Q1
Fuel Technology	2013	Q1
Fuel Technology	2014	Q1
Fuel Technology	2015	Q1
Fuel Technology	2016	Q1
Fuel Technology	2017	Q1
Fuel Technology	2018	Q1
Fuel Technology	2019	Q1
Fuel Technology	2020	Q1
Fuel Technology	2021	Q1
Physics and Astronomy (miscellaneous)	1999	Q2
Physics and Astronomy (miscellaneous)	2000	Q1
Physics and Astronomy (miscellaneous)	2001	Q1
Physics and Astronomy (miscellaneous)	2002	Q1
Physics and Astronomy (miscellaneous)	2003	Q1
Physics and Astronomy (miscellaneous)	2004	Q1
Physics and Astronomy (miscellaneous)	2005	Q1
Physics and Astronomy (miscellaneous)	2006	Q1
Physics and Astronomy (miscellaneous)	2007	Q1
Physics and Astronomy (miscellaneous)	2008	Q2
Physics and Astronomy (miscellaneous)	2009	Q1
Physics and Astronomy (miscellaneous)	2010	Q1
Physics and Astronomy (miscellaneous)	2011	Q1
Physics and Astronomy (miscellaneous)	2012	Q1
Physics and Astronomy (miscellaneous)	2013	Q1
Physics and Astronomy (miscellaneous)	2014	Q1
Physics and Astronomy (miscellaneous)	2015	Q1
Physics and Astronomy (miscellaneous)	2016	Q1
Physics and Astronomy (miscellaneous)	2017	Q1
Physics and Astronomy (miscellaneous)	2018	Q1
Physics and Astronomy (miscellaneous)	2019	Q1
Physics and Astronomy (miscellaneous)	2020	Q1
Physics and Astronomy (miscellaneous)	2021	Q1

SJR

The SJR is a size-independent prestige indicator that ranks journals by their 'average prestige per article'. It is based on the idea that 'all citations are not created equal'. SJR is a measure of scientific influence of journals that accounts for both the number of citations received by a journal and the importance or prestige of the journals where such citations come from It measures the scientific influence of the average article in a journal, it expresses how central to the global scientific discussion an average article of the journal is.

Year	SJR
1999	0.940
2000	2.682
2001	1.893
2002	1.959
2003	1.742
2004	1.001
2005	2.295
2006	1.953
2007	3.075
2008	0.903
2009	2.795
2010	1.102
2011	3.081
2012	1.361
2013	2.722
2014	1.335
2015	2.807
2016	1.117
2017	2.427
2018	1.290
2019	2.079
2020	1.890
2021	1.683

Total Documents

Evolution of the number of published documents. All types of documents are considered, including citable and non citable documents.

Year	Documents
1999	208
2000	184
2001	173
2002	129
2003	183
2004	147
2005	153
2006	201
2007	136
2008	206
2009	212
2010	224
2011	228
2012	314
2013	268
2014	285
2015	371
2016	368
2017	350
2018	465
2019	446
2020	468
2021	541

Citations per document

This indicator counts the number of citations received by documents from a journal and divides them by the total number of documents published in that journal. The chart shows the evolution of the average number of times documents published in a journal in the past two, three and four years have been cited in the current year. The two years line is equivalent to journal impact factor ™ (Thomson Reuters) metric.

Cites per document	Year	Value
Cites / Doc. (4 years)	1999	1.552
Cites / Doc. (4 years)	2000	2.785
Cites / Doc. (4 years)	2001	1.804
Cites / Doc. (4 years)	2002	2.525
Cites / Doc. (4 years)	2003	2.024
Cites / Doc. (4 years)	2004	1.903
Cites / Doc. (4 years)	2005	3.449
Cites / Doc. (4 years)	2006	2.838
Cites / Doc. (4 years)	2007	4.437
Cites / Doc. (4 years)	2008	3.389
Cites / Doc. (4 years)	2009	4.434
Cites / Doc. (4 years)	2010	3.722
Cites / Doc. (4 years)	2011	4.916
Cites / Doc. (4 years)	2012	4.677
Cites / Doc. (4 years)	2013	6.152
Cites / Doc. (4 years)	2014	4.635
Cites / Doc. (4 years)	2015	5.743
Cites / Doc. (4 years)	2016	4.727
Cites / Doc. (4 years)	2017	6.017
Cites / Doc. (4 years)	2018	5.314
Cites / Doc. (4 years)	2019	6.171
Cites / Doc. (4 years)	2020	4.837
Cites / Doc. (4 years)	2021	6.116
Cites / Doc. (3 years)	1999	1.552
Cites / Doc. (3 years)	2000	2.785
Cites / Doc. (3 years)	2001	1.790
Cites / Doc. (3 years)	2002	2.471
Cites / Doc. (3 years)	2003	1.930
Cites / Doc. (3 years)	2004	1.784
Cites / Doc. (3 years)	2005	3.362
Cites / Doc. (3 years)	2006	2.878
Cites / Doc. (3 years)	2007	4.333
Cites / Doc. (3 years)	2008	3.129
Cites / Doc. (3 years)	2009	4.142
Cites / Doc. (3 years)	2010	3.782
Cites / Doc. (3 years)	2011	5.050
Cites / Doc. (3 years)	2012	4.661
Cites / Doc. (3 years)	2013	6.048
Cites / Doc. (3 years)	2014	4.280
Cites / Doc. (3 years)	2015	5.561
Cites / Doc. (3 years)	2016	4.525
Cites / Doc. (3 years)	2017	5.977
Cites / Doc. (3 years)	2018	5.247
Cites / Doc. (3 years)	2019	5.764
Cites / Doc. (3 years)	2020	4.591
Cites / Doc. (3 years)	2021	5.901
Cites / Doc. (2 years)	1999	1.429
Cites / Doc. (2 years)	2000	2.752
Cites / Doc. (2 years)	2001	1.663
Cites / Doc. (2 years)	2002	2.353
Cites / Doc. (2 years)	2003	1.848
Cites / Doc. (2 years)	2004	1.593
Cites / Doc. (2 years)	2005	3.348
Cites / Doc. (2 years)	2006	2.677
Cites / Doc. (2 years)	2007	3.808
Cites / Doc. (2 years)	2008	2.855
Cites / Doc. (2 years)	2009	3.930
Cites / Doc. (2 years)	2010	3.708
Cites / Doc. (2 years)	2011	4.833
Cites / Doc. (2 years)	2012	4.582
Cites / Doc. (2 years)	2013	5.537
Cites / Doc. (2 years)	2014	4.082
Cites / Doc. (2 years)	2015	5.029
Cites / Doc. (2 years)	2016	4.314
Cites / Doc. (2 years)	2017	5.590
Cites / Doc. (2 years)	2018	4.822
Cites / Doc. (2 years)	2019	5.320
Cites / Doc. (2 years)	2020	4.439
Cites / Doc. (2 years)	2021	5.616

Total Cites

Self-Cites

Evolution of the total number of citations and journal's self-citations received by a journal's published documents during the three previous years.
Journal Self-citation is defined as the number of citation from a journal citing article to articles published by the same journal.

Cites	Year	Value
Self Cites	1999	253
Self Cites	2000	303
Self Cites	2001	245
Self Cites	2002	178
Self Cites	2003	191
Self Cites	2004	134
Self Cites	2005	184
Self Cites	2006	215
Self Cites	2007	211
Self Cites	2008	294
Self Cites	2009	355
Self Cites	2010	385
Self Cites	2011	481
Self Cites	2012	702
Self Cites	2013	626
Self Cites	2014	697
Self Cites	2015	968
Self Cites	2016	948
Self Cites	2017	920
Self Cites	2018	1218
Self Cites	2019	1271
Self Cites	2020	1204
Self Cites	2021	1493
Total Cites	1999	751
Total Cites	2000	1487
Total Cites	2001	1029
Total Cites	2002	1396
Total Cites	2003	938
Total Cites	2004	865
Total Cites	2005	1543
Total Cites	2006	1390
Total Cites	2007	2171
Total Cites	2008	1533
Total Cites	2009	2249
Total Cites	2010	2095
Total Cites	2011	3242
Total Cites	2012	3095
Total Cites	2013	4633
Total Cites	2014	3467
Total Cites	2015	4821
Total Cites	2016	4181
Total Cites	2017	6120
Total Cites	2018	5714
Total Cites	2019	6819
Total Cites	2020	5789
Total Cites	2021	8137

External Cites per Doc

Cites per Doc

Evolution of the number of total citation per document and external citation per document (i.e. journal self-citations removed) received by a journal's published documents during the three previous years. External citations are calculated by subtracting the number of self-citations from the total number of citations received by the journal’s documents.

Cites	Year	Value
External Cites per document	1999	1.035
External Cites per document	2000	2.234
External Cites per document	2001	1.378
External Cites per document	2002	2.171
External Cites per document	2003	1.559
External Cites per document	2004	1.529
External Cites per document	2005	3.013
External Cites per document	2006	2.463
External Cites per document	2007	3.944
External Cites per document	2008	2.560
External Cites per document	2009	3.540
External Cites per document	2010	3.161
External Cites per document	2011	4.396
External Cites per document	2012	3.693
External Cites per document	2013	5.336
External Cites per document	2014	3.471
External Cites per document	2015	4.480
External Cites per document	2016	3.518
External Cites per document	2017	5.093
External Cites per document	2018	4.144
External Cites per document	2019	4.702
External Cites per document	2020	3.645
External Cites per document	2021	4.825
Cites per document	1999	1.552
Cites per document	2000	2.785
Cites per document	2001	1.790
Cites per document	2002	2.471
Cites per document	2003	1.930
Cites per document	2004	1.784
Cites per document	2005	3.362
Cites per document	2006	2.878
Cites per document	2007	4.333
Cites per document	2008	3.129
Cites per document	2009	4.142
Cites per document	2010	3.782
Cites per document	2011	5.050
Cites per document	2012	4.661
Cites per document	2013	6.048
Cites per document	2014	4.280
Cites per document	2015	5.561
Cites per document	2016	4.525
Cites per document	2017	5.977
Cites per document	2018	5.247
Cites per document	2019	5.764
Cites per document	2020	4.591
Cites per document	2021	5.901

% International Collaboration

International Collaboration accounts for the articles that have been produced by researchers from several countries. The chart shows the ratio of a journal's documents signed by researchers from more than one country; that is including more than one country address.

Year	International Collaboration
1999	10.10
2000	17.93
2001	16.18
2002	16.28
2003	18.58
2004	14.29
2005	13.07
2006	18.41
2007	21.32
2008	20.87
2009	19.34
2010	20.98
2011	21.49
2012	26.43
2013	31.72
2014	28.42
2015	35.85
2016	37.23
2017	35.71
2018	35.27
2019	35.20
2020	34.83
2021	33.83

Citable documents

Non-citable documents

Not every article in a journal is considered primary research and therefore "citable", this chart shows the ratio of a journal's articles including substantial research (research articles, conference papers and reviews) in three year windows vs. those documents other than research articles, reviews and conference papers.

Documents	Year	Value
Non-citable documents	1999	3
Non-citable documents	2000	4
Non-citable documents	2001	6
Non-citable documents	2002	4
Non-citable documents	2003	7
Non-citable documents	2004	7
Non-citable documents	2005	8
Non-citable documents	2006	6
Non-citable documents	2007	4
Non-citable documents	2008	6
Non-citable documents	2009	8
Non-citable documents	2010	13
Non-citable documents	2011	14
Non-citable documents	2012	16
Non-citable documents	2013	15
Non-citable documents	2014	12
Non-citable documents	2015	7
Non-citable documents	2016	5
Non-citable documents	2017	3
Non-citable documents	2018	4
Non-citable documents	2019	3
Non-citable documents	2020	3
Non-citable documents	2021	2
Citable documents	1999	481
Citable documents	2000	530
Citable documents	2001	569
Citable documents	2002	561
Citable documents	2003	479
Citable documents	2004	478
Citable documents	2005	451
Citable documents	2006	477
Citable documents	2007	497
Citable documents	2008	484
Citable documents	2009	535
Citable documents	2010	541
Citable documents	2011	628
Citable documents	2012	648
Citable documents	2013	751
Citable documents	2014	798
Citable documents	2015	860
Citable documents	2016	919
Citable documents	2017	1021
Citable documents	2018	1085
Citable documents	2019	1180
Citable documents	2020	1258
Citable documents	2021	1377

Cited documents

Uncited documents

Ratio of a journal's items, grouped in three years windows, that have been cited at least once vs. those not cited during the following year.

Documents	Year	Value
Uncited documents	1999	178
Uncited documents	2000	133
Uncited documents	2001	201
Uncited documents	2002	146
Uncited documents	2003	136
Uncited documents	2004	178
Uncited documents	2005	78
Uncited documents	2006	107
Uncited documents	2007	82
Uncited documents	2008	94
Uncited documents	2009	81
Uncited documents	2010	110
Uncited documents	2011	77
Uncited documents	2012	100
Uncited documents	2013	80
Uncited documents	2014	116
Uncited documents	2015	77
Uncited documents	2016	90
Uncited documents	2017	64
Uncited documents	2018	75
Uncited documents	2019	89
Uncited documents	2020	115
Uncited documents	2021	107
Cited documents	1999	306
Cited documents	2000	401
Cited documents	2001	374
Cited documents	2002	419
Cited documents	2003	350
Cited documents	2004	307
Cited documents	2005	381
Cited documents	2006	376
Cited documents	2007	419
Cited documents	2008	396
Cited documents	2009	462
Cited documents	2010	444
Cited documents	2011	565
Cited documents	2012	564
Cited documents	2013	686
Cited documents	2014	694
Cited documents	2015	790
Cited documents	2016	834
Cited documents	2017	960
Cited documents	2018	1014
Cited documents	2019	1094
Cited documents	2020	1146
Cited documents	2021	1272