Atomization and Sprays最新文献_第4页

EXPERIMENTAL INVESTIGATION OF DOUBLE SELF-IMPINGING JETS WITH HIGH REYNOLDS AND WEBER NUMBERS 高雷诺数和韦伯数双自临界射流的实验研究

IF 1.2 4区工程技术

Atomization and Sprays Pub Date : 2024-01-01 DOI: 10.1615/atomizspr.2024053721

Bartosz Kaźmierski, Łukasz Jan Kapusta

{"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}

引用次数: 0

Characterization of fully developed air-assisted spray unsteadiness using RP-3 jet fuel 利用RP-3喷气燃料充分发展的空气辅助喷射非定常特性

4区工程技术

Atomization and Sprays Pub Date : 2023-01-01 DOI: 10.1615/atomizspr.2023048141

Hao Wu, Zhenyu ZHANG, Fujun Zhang, Kun Wu, William L. Roberts

{"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}

引用次数: 0

MERGING TWO CONICAL LIQUID SHEETS IN LIQUID-LIQUID COAXIAL PRESSURE-SWIRL INJECTORS 液-液同轴压力-旋流喷射器中两个锥形液片的合并

IF 1.2 4区工程技术

Atomization and Sprays Pub Date : 2023-01-01 DOI: 10.1615/atomizspr.2023046701

Ali Rastegarkoutenaei, H. Ghassemi

引用次数: 0

Validation of a stochastic breakup model for turbulent jets in high-speed crossflow: Assessment of turbulent interactions and sensitivity to boundary conditions 高速横流中湍流射流的随机破裂模型的验证:湍流相互作用和对边界条件敏感性的评估

IF 1.2 4区工程技术

Atomization and Sprays Pub Date : 2023-01-01 DOI: 10.1615/atomizspr.2023041220

Malika Zghal, Xiaoxiao Sun, P. Gauthier, V. Sethi

引用次数: 0

Does internal convection promote micro-explosion of w/o emulsion droplets ? 内部对流是否促进w/o乳状液滴微爆炸?

IF 1.2 4区工程技术

Atomization and Sprays Pub Date : 2023-01-01 DOI: 10.1615/atomizspr.2023047776

Thomas Naudin, D. Tarlet, R. Calabria, P. Massoli, J. Bellettre

引用次数: 0

Influence mechanism of stagnation-point flow on liquid-phase spray penetration length under engine-like conditions 发动机工况下滞点流动对液相喷雾穿透长度的影响机理

IF 1.2 4区工程技术

Atomization and Sprays Pub Date : 2023-01-01 DOI: 10.1615/atomizspr.2023048150

Dongfang Wang, Ziming Yang, Yikai Li, Chang Cai, Zhongjie Shi

引用次数: 0

A numerical study of trans/supercritical fuel injection based on a generalized cubic equation of state 基于广义三次状态方程的反/超临界燃油喷射数值研究

IF 1.2 4区工程技术

Atomization and Sprays Pub Date : 2023-01-01 DOI: 10.1615/atomizspr.2023047070

Jie Ma, Hongsheng Liu, L. Li, Jianxin Huang, M. Xie

引用次数: 0

Investigation of the Effects of Vortex-Induced String Cavitation on Flow and Spray Characteristics within Diesel Fuel Injection Nozzles 涡致柱状空化对柴油喷射喷嘴内流动和喷雾特性影响的研究

4区工程技术

Atomization and Sprays Pub Date : 2023-01-01 DOI: 10.1615/atomizspr.2023049681

Chen Li, Zhixia He, Wei Guan, Genmiao Guo

{"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}

引用次数: 0

Obituary for Prof. Norman Chigier Norman Chigier教授的讣告

IF 1.2 4区工程技术

Atomization and Sprays Pub Date : 2023-01-01 DOI: 10.1615/atomizspr.2023048537

G. Brenn, Marcus Herrmann, David Hung

引用次数: 0

Spray Impingement Film Analysis: Characteristics Evaluation and Corresponding Simulation Method 喷雾冲击膜分析:特性评价及仿真方法

IF 1.2 4区工程技术

Atomization and Sprays Pub Date : 2023-01-01 DOI: 10.1615/atomizspr.2023045655

Shangning Wang, Jingjing Cao, Di Xiao, Shuyi Qiu, Min Xu, Xuesong Li

引用次数: 0