Experimental study of the spray characteristics of twin-fluid atomization: Focusing on the annular flow regime

doi:10.1063/5.0128231

	Experimental study of the spray characteristics of twin-fluid atomization: Focusing on the annular flow regime
	Liu C(刘畅); Wu K(吴坤); Zhang, Zhenyu; Yuan YM(袁越明); Fan XJ(范学军)
通讯作者	Wu, Kun(wukun@imech.ac.cn)
发表期刊	PHYSICS OF FLUIDS
	2022-12-01
卷号	34 期号:12 页码:21
ISSN	1070-6631
摘要	The characteristics of twin-fluid atomization operating in the annular flow regime were studied experimentally under various gas-to-liquid ratios (GLRs) and injection pressures. The macroscopic morphology of the spray was obtained by shadowgraph, while the droplet size and velocity were measured using a phase-Doppler particle analyzer technique. It was found that the spray cone angle increases almost linearly with the GLR, and the axial distance required for droplet coalescence to outweigh the breakup decreases with increasing GLR. The Sauter mean diameter (SMD) first decreases and then increases along the axial direction due to the competition between turbulent breakup and droplet coalescence. The droplet size follows a lognormal distribution; the droplet velocity distribution is closer to a lognormal distribution under large GLRs, while it follows normal distribution with GLR 1/4 3%. Regarding the radial distribution, low GLRs (3% and 5%) lead to a bimodal spatial velocity distribution, while for large GLRs, the droplet velocity decreases monotonically toward the far field. The spray tends to become more stable with increasing GLR and injection pressure P-inj, whereas the SMD increases with increasing P-inj. The underlying atomization mechanism in a twin-fluid injector in the annular flow state can be regarded as the disintegration of the initial liquid sheet by longitudinal Kelvin-Helmholtz instability followed by transverse Rayleigh-Taylor instability, which yields a direct proportionality of the droplet size to the initial liquid sheet thickness delta(L). Subsequently, for high Pinj, the gas core shrinks and DL increases, which results in an increased SMD but enhanced atomization efficiency delta(L)=SMD.
DOI	10.1063/5.0128231
收录类别	SCI ; EI
语种	英语
WOS记录号	WOS:000916458500005
关键词[WOS]	LIQUID SHEET ; EFFERVESCENT ATOMIZER ; BREAKUP ; AIR ; MECHANISM ; JET ; INSTABILITY
WOS研究方向	Mechanics ; Physics
WOS类目	Mechanics ; Physics, Fluids & Plasmas
资助项目	National Natural Science Foundation of China ; Foundation Research Funds of the Ministry of Industry and Information Technology ; Beijing Institute of Technology Research Fund Program for Young Scholars ; [51806013] ; [JCKY2019602D018] ; [WDZC-2019-JGKK-02] ; [2020CX04047]
项目资助者	National Natural Science Foundation of China ; Foundation Research Funds of the Ministry of Industry and Information Technology ; Beijing Institute of Technology Research Fund Program for Young Scholars
论文分区	一类/力学重要期刊
力学所作者排名	1
RpAuthor	Wu, Kun
引用统计	被引频次：10[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://dspace.imech.ac.cn/handle/311007/91529
专题	高温气体动力学国家重点实验室
推荐引用方式 GB/T 7714	Liu C,Wu K,Zhang, Zhenyu,et al. Experimental study of the spray characteristics of twin-fluid atomization: Focusing on the annular flow regime[J]. PHYSICS OF FLUIDS,2022,34,12,:21.
APA	刘畅,吴坤,Zhang, Zhenyu,袁越明,&范学军.(2022).Experimental study of the spray characteristics of twin-fluid atomization: Focusing on the annular flow regime.PHYSICS OF FLUIDS,34(12),21.
MLA	刘畅,et al."Experimental study of the spray characteristics of twin-fluid atomization: Focusing on the annular flow regime".PHYSICS OF FLUIDS 34.12(2022):21.

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