Pub Date : 2024-01-01DOI: 10.1615/atomizspr.2024053721
Bartosz Kaźmierski, Łukasz Jan Kapusta
Self-impinging liquid jets can provide efficient atomization, which is utilized, inter alia, in rocket engines. The following research presents an analysis of structures formed by the collision of two jets with an impingement angle of 30° under relatively high Reynolds and Weber numbers. Structures formed by two symmetrical water columns impinging at a low angle were investigated experimentally using a high-speed camera and global illumination. It aimed at verifying within what angles (measured in two perpendicular directions) the liquid is distributed depending on the jets' Reynolds and Weber numbers. The results revealed that the spray cloud is highly affected by the ruptures of the liquid sheet, which leads to its immediate disintegration for high Reynolds and Weber numbers of jets. Increased dimensionless numbers resulted in a wider spray angle observed in a normal direction to the plane of jets. At the same time, the angle viewed parallel to the jets' plane decreased, indicating a possible transition from a planar to a conical spray shape. When these two dimensionless numbers are high enough, intensive atomization of wide, symmetrical spray can be achieved even under low injection pressures (≤ 1 MPa).
{"title":"EXPERIMENTAL INVESTIGATION OF DOUBLE SELF-IMPINGING JETS WITH HIGH REYNOLDS AND WEBER NUMBERS","authors":"Bartosz Kaźmierski, Łukasz Jan Kapusta","doi":"10.1615/atomizspr.2024053721","DOIUrl":"https://doi.org/10.1615/atomizspr.2024053721","url":null,"abstract":"Self-impinging liquid jets can provide efficient atomization, which is utilized, inter alia, in rocket engines. The following research presents an analysis of structures formed by the collision of two jets with an impingement angle of 30° under relatively high Reynolds and Weber numbers. Structures formed by two symmetrical water columns impinging at a low angle were investigated experimentally using a high-speed camera and global illumination. It aimed at verifying within what angles (measured in two perpendicular directions) the liquid is distributed depending on the jets' Reynolds and Weber numbers. The results revealed that the spray cloud is highly affected by the ruptures of the liquid sheet, which leads to its immediate disintegration for high Reynolds and Weber numbers of jets. Increased dimensionless numbers resulted in a wider spray angle observed in a normal direction to the plane of jets. At the same time, the angle viewed parallel to the jets' plane decreased, indicating a possible transition from a planar to a conical spray shape. When these two dimensionless numbers are high enough, intensive atomization of wide, symmetrical spray can be achieved even under low injection pressures (≤ 1 MPa).","PeriodicalId":8637,"journal":{"name":"Atomization and Sprays","volume":"118 1","pages":""},"PeriodicalIF":1.2,"publicationDate":"2024-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142181923","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-01-01DOI: 10.1615/atomizspr.2023046701
Ali Rastegarkoutenaei, H. Ghassemi
{"title":"MERGING TWO CONICAL LIQUID SHEETS IN LIQUID-LIQUID COAXIAL PRESSURE-SWIRL INJECTORS","authors":"Ali Rastegarkoutenaei, H. Ghassemi","doi":"10.1615/atomizspr.2023046701","DOIUrl":"https://doi.org/10.1615/atomizspr.2023046701","url":null,"abstract":"","PeriodicalId":8637,"journal":{"name":"Atomization and Sprays","volume":"1 1","pages":""},"PeriodicalIF":1.2,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67406294","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-01-01DOI: 10.1615/atomizspr.2023041220
Malika Zghal, Xiaoxiao Sun, P. Gauthier, V. Sethi
{"title":"Validation of a stochastic breakup model for turbulent jets in high-speed crossflow: Assessment of turbulent interactions and sensitivity to boundary conditions","authors":"Malika Zghal, Xiaoxiao Sun, P. Gauthier, V. Sethi","doi":"10.1615/atomizspr.2023041220","DOIUrl":"https://doi.org/10.1615/atomizspr.2023041220","url":null,"abstract":"","PeriodicalId":8637,"journal":{"name":"Atomization and Sprays","volume":"1 1","pages":""},"PeriodicalIF":1.2,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67406431","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-01-01DOI: 10.1615/atomizspr.2023047776
Thomas Naudin, D. Tarlet, R. Calabria, P. Massoli, J. Bellettre
{"title":"Does internal convection promote micro-explosion of w/o emulsion droplets ?","authors":"Thomas Naudin, D. Tarlet, R. Calabria, P. Massoli, J. Bellettre","doi":"10.1615/atomizspr.2023047776","DOIUrl":"https://doi.org/10.1615/atomizspr.2023047776","url":null,"abstract":"","PeriodicalId":8637,"journal":{"name":"Atomization and Sprays","volume":"35 1","pages":""},"PeriodicalIF":1.2,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67406462","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-01-01DOI: 10.1615/atomizspr.2023048141
Hao Wu, Zhenyu ZHANG, Fujun Zhang, Kun Wu, William L. Roberts
The ideal spray theory of Edwards and Marx was utilized to investigate the dependence of fully developed intermittent air-assisted spray unsteadiness on operational conditions and fluid properties. Time series information of spray droplets was identified by Phase/Doppler Particle Analyzer and used for inter-particle arrival time statistics. Results demonstrated that spray unsteadiness along the spray axis and near the nozzle exit area is more significant than far-nozzle field and spray periphery. The unsteadiness on the spray axis shows a decreasing function with the fuel injection durations, while the increase of air injection duration significantly elongates the unstable region on the spray axis. The properties of test liquid fuels show a moderate effect on the stability of the air-assisted spray, which is most likely due to the effects of liquid properties on the atomization characteristics. Chi-square is generally the preferred method for quantifying the global spray unsteadiness when compared to the deviation of the first time gap of experimental and theoretical inter-particle time distribution. Unsteadiness results of high-velocity droplet spray stage are relatively distinct compared to droplet deceleration and suspension stages, which is due to the continuous energy input at the opening duration of the nozzle. This result further indicates that droplet velocity plays an important role in determining spray unsteadiness.
{"title":"Characterization of fully developed air-assisted spray unsteadiness using RP-3 jet fuel","authors":"Hao Wu, Zhenyu ZHANG, Fujun Zhang, Kun Wu, William L. Roberts","doi":"10.1615/atomizspr.2023048141","DOIUrl":"https://doi.org/10.1615/atomizspr.2023048141","url":null,"abstract":"The ideal spray theory of Edwards and Marx was utilized to investigate the dependence of fully developed intermittent air-assisted spray unsteadiness on operational conditions and fluid properties. Time series information of spray droplets was identified by Phase/Doppler Particle Analyzer and used for inter-particle arrival time statistics. Results demonstrated that spray unsteadiness along the spray axis and near the nozzle exit area is more significant than far-nozzle field and spray periphery. The unsteadiness on the spray axis shows a decreasing function with the fuel injection durations, while the increase of air injection duration significantly elongates the unstable region on the spray axis. The properties of test liquid fuels show a moderate effect on the stability of the air-assisted spray, which is most likely due to the effects of liquid properties on the atomization characteristics. Chi-square is generally the preferred method for quantifying the global spray unsteadiness when compared to the deviation of the first time gap of experimental and theoretical inter-particle time distribution. Unsteadiness results of high-velocity droplet spray stage are relatively distinct compared to droplet deceleration and suspension stages, which is due to the continuous energy input at the opening duration of the nozzle. This result further indicates that droplet velocity plays an important role in determining spray unsteadiness.","PeriodicalId":8637,"journal":{"name":"Atomization and Sprays","volume":"21 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136303545","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-01-01DOI: 10.1615/atomizspr.2023047070
Jie Ma, Hongsheng Liu, L. Li, Jianxin Huang, M. Xie
{"title":"A numerical study of trans/supercritical fuel injection based on a generalized cubic equation of state","authors":"Jie Ma, Hongsheng Liu, L. Li, Jianxin Huang, M. Xie","doi":"10.1615/atomizspr.2023047070","DOIUrl":"https://doi.org/10.1615/atomizspr.2023047070","url":null,"abstract":"","PeriodicalId":8637,"journal":{"name":"Atomization and Sprays","volume":"1 1","pages":""},"PeriodicalIF":1.2,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67406376","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-01-01DOI: 10.1615/atomizspr.2023049681
Chen Li, Zhixia He, Wei Guan, Genmiao Guo
The diesel fuel injection system relies heavily on the precise operation of the fuel injection nozzle, universally recognized as its foundational component. A key factor significantly affecting both flow capacity and injection performance is the internal flow characteristics of the nozzle. This study investigates the vortex-induced string cavitation within fuel injector nozzles by incorporating high-speed imaging, particle image velocimetry techniques, and numerical simulations. The results demonstrate that an increase in injection pressure precipitates an escalation in string cavitation intensity, thus reducing the effective flow area and compromising internal flow capacity. Importantly, our study confirms that, despite its intensified occurrence under higher pressure, string cavitation does not cause significant erosion damage. Instead, it plays a pivotal role in promoting fuel atomization by injecting it into a rotational state, facilitated by the cyclonic action within the nozzle. Furthermore, our observations reveal a notable distinction between needle-hole string cavitation and hole-hole string cavitation. Specifically, needle-hole string cavitation produces more extensive spray angles compared to hole-hole string cavitation. However, it is crucial to note that the former exhibits reduced uniformity in the distribution of velocity fields and a weakening of the jet atomization effect. In conclusion, this comprehensive study provides valuable insights into the intricate mechanisms of string cavitation. Through an exhaustive exploration of flow characteristics, erosion effects, and atomization processes, our work significantly contributes to the field of fuel injection
{"title":"Investigation of the Effects of Vortex-Induced String Cavitation on Flow and Spray Characteristics within Diesel Fuel Injection Nozzles","authors":"Chen Li, Zhixia He, Wei Guan, Genmiao Guo","doi":"10.1615/atomizspr.2023049681","DOIUrl":"https://doi.org/10.1615/atomizspr.2023049681","url":null,"abstract":"The diesel fuel injection system relies heavily on the precise operation of the fuel injection nozzle, universally recognized as its foundational component. A key factor significantly affecting both flow capacity and injection performance is the internal flow characteristics of the nozzle. This study investigates the vortex-induced string cavitation within fuel injector nozzles by incorporating high-speed imaging, particle image velocimetry techniques, and numerical simulations. The results demonstrate that an increase in injection pressure precipitates an escalation in string cavitation intensity, thus reducing the effective flow area and compromising internal flow capacity. Importantly, our study confirms that, despite its intensified occurrence under higher pressure, string cavitation does not cause significant erosion damage. Instead, it plays a pivotal role in promoting fuel atomization by injecting it into a rotational state, facilitated by the cyclonic action within the nozzle. Furthermore, our observations reveal a notable distinction between needle-hole string cavitation and hole-hole string cavitation. Specifically, needle-hole string cavitation produces more extensive spray angles compared to hole-hole string cavitation. However, it is crucial to note that the former exhibits reduced uniformity in the distribution of velocity fields and a weakening of the jet atomization effect. In conclusion, this comprehensive study provides valuable insights into the intricate mechanisms of string cavitation. Through an exhaustive exploration of flow characteristics, erosion effects, and atomization processes, our work significantly contributes to the field of fuel injection","PeriodicalId":8637,"journal":{"name":"Atomization and Sprays","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135952892","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-01-01DOI: 10.1615/atomizspr.2023048537
G. Brenn, Marcus Herrmann, David Hung
{"title":"Obituary for Prof. Norman Chigier","authors":"G. Brenn, Marcus Herrmann, David Hung","doi":"10.1615/atomizspr.2023048537","DOIUrl":"https://doi.org/10.1615/atomizspr.2023048537","url":null,"abstract":"","PeriodicalId":8637,"journal":{"name":"Atomization and Sprays","volume":"33 1","pages":""},"PeriodicalIF":1.2,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67406061","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-01-01DOI: 10.1615/atomizspr.2023045655
Shangning Wang, Jingjing Cao, Di Xiao, Shuyi Qiu, Min Xu, Xuesong Li
{"title":"Spray Impingement Film Analysis: Characteristics Evaluation and Corresponding Simulation Method","authors":"Shangning Wang, Jingjing Cao, Di Xiao, Shuyi Qiu, Min Xu, Xuesong Li","doi":"10.1615/atomizspr.2023045655","DOIUrl":"https://doi.org/10.1615/atomizspr.2023045655","url":null,"abstract":"","PeriodicalId":8637,"journal":{"name":"Atomization and Sprays","volume":"1 1","pages":""},"PeriodicalIF":1.2,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67406141","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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