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Optimization Analysis of the Mixing Chamber and Diffuser of Ejector Based on Fano Flow Model

Lixing Zheng1,*, Weibo Wang2, Yiyan Zhang1, Lingmei Wang3, Wei Lu2
1 School of Electric Power, Civil Engineering and Architecture, Shanxi University, Taiyuan, 030006, China
2 School of Mechanical Engineering, Guangxi University, Nanning, 530004, China
3 Wind Turbine Monitoring and Diagnosis, NTRC of Shanxi Province, Taiyuan, 030006, China
* Corresponding Author: Lixing Zheng. Email:
(This article belongs to this Special Issue: Recent Advance of the Isogeometric Boundary Element Method and its Applications)

Computer Modeling in Engineering & Sciences 2022, 133(1), 153-170. https://doi.org/10.32604/cmes.2022.021235

Received 03 January 2022; Accepted 09 February 2022; Issue published 18 July 2022

Abstract

An improved model to calculate the length of the mixing chamber of the ejector was proposed on the basis of the Fano flow model, and a method to optimize the structures of the mixing chamber and diffuser of the ejector was put forward. The accuracy of the model was verified by comparing the theoretical results calculated using the model to experimental data reported in literature. Variations in the length of the mixing chamber Lm and length of the diffuser Ld with respect to variations in the outlet temperature of the ejector Tc, outlet pressure of the ejector pc, and the expansion ratio of the pressure of the primary flow to that of the secondary flow pg/pe were investigated. Moreover, variations in Lm and Ld with respect to variations in the ratio of the diameter of the throat of the motive nozzle to the diameter of the mixing chamber dg0/dc3 and ratio of the outlet diameter of the diffuser to the diameter of the mixing chamber dc/dc3 were investigated. The distribution of flow fields in the ejector was simulated. Increasing Lm and dc3 reduced Tc and pc. Moreover, reducing pg/pe or dg0/dc3 reduced Tc and pc. The length of the mixed section Lm2, which was determined on the basis of the Fano flow model, increased as pg increased and decreased as dc3 increased. The mixing length Lm1, which was considered the primary flow expansion, showed the opposite trend with that of Lm2. Moreover, Ld increased as pg/pe and dc/dc3 increased. When the value of dc was 1.8 to 2.0 times as high as that of dc3, the semi-cone angle of the diffuser ranged between 6° and 12°. At a constant dc/dc3, decreasing Tc and pc increased Ld.

Keywords

Mixing chamber; length; Fano flow; diffuser; diameter ratio; expansion ratio; optimization method

Cite This Article

Zheng, L., Wang, W., Zhang, Y., Wang, L., Lu, W. (2022). Optimization Analysis of the Mixing Chamber and Diffuser of Ejector Based on Fano Flow Model. CMES-Computer Modeling in Engineering & Sciences, 133(1), 153–170.



This work is licensed under a Creative Commons Attribution 4.0 International License , which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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