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Experimental Investigation of the Performance and Spray Characteristics of a Supersonic Two-Phase Flow Ejector with Different Structures

1
Institute of Marine Science and Technology, Shandong University, Qingdao 266237, China
2
School of Mechanical Engineering, Shandong University, Jinan 250061, China
3
School of Energy and Power Engineering, Shandong University, Jinan 250061, China
*
Author to whom correspondence should be addressed.
Energies 2020, 13(5), 1166; https://doi.org/10.3390/en13051166
Received: 14 January 2020 / Revised: 29 February 2020 / Accepted: 2 March 2020 / Published: 4 March 2020
(This article belongs to the Section Energy Fundamentals and Conversion)
A two-phase flow ejector is an important part of a water mist fire suppression system, and these devices have become a popular research topic in recent years. This paper proposes a supersonic ejector that aims to improve the efficiency of water mist fire suppression systems. The effects of ejector geometric parameters on the entrainment ratio (ER) were explored. The effects of primary flow pressure (PP) on the mixing process and flow phenomena were studied by a high-speed camera. The experimental results show that the ER first increases and then decreases with increasing PP. ER increases with increasing ejector area ratio (AR). The PP corresponding to the maximum ER of ejectors with a different nozzle exit position (NXP) is 3.6 bar. The ejector with an NXP of +1 and AR of 6 demonstrate the best performance, and the ER of this ejector reaches 36.29. The spray half-cone angle of the ejector increases with increasing ER, reaching a maximum value of 7.07°. The unstable atomization half-cone angle is mainly due to a two-phase flow pulsating phenomenon. The pulsation period is 10 ms. In the present study, a general rule that provides a reference for ejector design and selection was obtained through experiments. View Full-Text
Keywords: two-phase ejectors; entrainment ratio; ejector structure; spray characteristics; visualization two-phase ejectors; entrainment ratio; ejector structure; spray characteristics; visualization
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MDPI and ACS Style

Li, S.; Li, W.; Liu, Y.; Ji, C.; Zhang, J. Experimental Investigation of the Performance and Spray Characteristics of a Supersonic Two-Phase Flow Ejector with Different Structures. Energies 2020, 13, 1166. https://doi.org/10.3390/en13051166

AMA Style

Li S, Li W, Liu Y, Ji C, Zhang J. Experimental Investigation of the Performance and Spray Characteristics of a Supersonic Two-Phase Flow Ejector with Different Structures. Energies. 2020; 13(5):1166. https://doi.org/10.3390/en13051166

Chicago/Turabian Style

Li, Shizhen; Li, Wei; Liu, Yanjun; Ji, Chen; Zhang, Jingzhi. 2020. "Experimental Investigation of the Performance and Spray Characteristics of a Supersonic Two-Phase Flow Ejector with Different Structures" Energies 13, no. 5: 1166. https://doi.org/10.3390/en13051166

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