Spray characteristics of misaligned impinging injectors
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The variances of atomization characteristics with the misalignment of injectors defined as the fraction of skewness for various angles ofimpingement and pressure conditions were studied using the doublet impinging injectors with a like-on-like arrangement. Water was used as simulantand the spray characteristics along with the changes in the skewness were analyzed using the methods of spray image photography. Experiment wascarried for the impinging nozzles of orifice diameter of 1.2 mm within Reynolds numbers ranging from 9 x103 - 4.5 x104 and the fraction of skewnessconsidered for the experiment ranges from 0.0 to 0.9 at ambient temperature condition. Flat sheet with a distinct rim produced perpendicular to theplane of impinging jets goes ondisappear and sheet appears comparatively shorterwith the increase in fraction of skewness resulting the atomizationof fluid droplet very close to impingement point with decrease in breakup length and increase in spray angle up to certain extent. The maximumallowable skewness was found as the result. The skewness up to the certain extent can be considered as the parameter to control the atomizationcharacteristics of simulant inside the combustion chamberproviding the high economic performance of fuel and time.
Abstract
The variances of atomization characteristics with the misalignment of injectors defined as the fraction of skewness for various angles ofimpingement and pressure conditions were studied using the doublet impinging injectors with a like-on-like arrangement. Water was used as simulantand the spray characteristics along with the changes in the skewness were analyzed using the methods of spray image photography. Experiment wascarried for the impinging nozzles of orifice diameter of 1.2 mm within Reynolds numbers ranging from 9 x103 - 4.5 x104 and the fraction of skewnessconsidered for the experiment ranges from 0.0 to 0.9 at ambient temperature condition. Flat sheet with a distinct rim produced perpendicular to theplane of impinging jets goes ondisappear and sheet appears comparatively shorterwith the increase in fraction of skewness resulting the atomizationof fluid droplet very close to impingement point with decrease in breakup length and increase in spray angle up to certain extent. The maximumallowable skewness was found as the result. The skewness up to the certain extent can be considered as the parameter to control the atomizationcharacteristics of simulant inside the combustion chamberproviding the high economic performance of fuel and time.
참고문헌 (6)
- W. E Anderson, "Fundamental Studies of Impinging Liquid Jets", Proceedings of the 30 th Aerospace Sciences Meeting (1992)
- H. M. Ryan, "Atomization characteristics of impinging liquid jets", Journal of Propulsion and Power, 11(1), pp.135~144 (1995)
- K. Jung, "Spray Characteristics of Impinging Jet InjectorsUsing Imaging Techniques", Proceedings of the 36 th AIAA, SAE, pp.ASEE Joint Propulsion Conference & Exhibit, 2000
- A Study of Sprays Formed by Two Impinging Jets, "M. F.Heidmann", NASA TN 3835, ~ (1957)
- H. P. Gadgil, "Effect of skewness on the characteristics of impinging jet atomizers", Atomization and Sprays, 19(1), pp.1~18 (2009)
- G. Bailardi, "Several aspects of the atomization behavior of various Newtonian fluids with a likeon-like impinging jet injector", Proceedings of the 23rd European Conference on Liquid Atomization and Spray Systems (2010)