Leakage analysis of helical grooved pump seal using CFD
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DOI 10.1007/s12206-020-0910-0
Journal of Mechanical Science and Technology 34 (10) 2020 Original Article DOI 10.1007/s12206-020-0910-0 Keywords: · Computational fluid dynamics · Helical grooved seal · Leakage · Non-contact seal
Correspondence to: Chul Kim [email protected]
Citation: Woo, S., Jang, H., Kwak, H., Moon, Y., Kim, C. (2020). Leakage analysis of helical grooved pump seal using CFD. Journal of Mechanical Science and Technology 34 (10) (2020) ?~?. http://doi.org/10.1007/s12206-020-0910-0
Received December 31st, 2019 Revised
June 10th, 2020
Accepted August 31st, 2020 † Recommended by Editor Yang Na
Leakage analysis of helical grooved pump seal using CFD Seongjun Woo1, Hyoseong Jang1, Hyoseo Kwak2, Younghoon Moon1 and Chul Kim1 1
2
School of Mechanical Engineering, Pusan National University, Busan 46241, Korea, School of Mechanical and Automotive Engineering, Youngsan University, Yangsan 50510, Korea
Abstract The helical grooved seal, which is a non-contact sealing device using the viscosity of the fluid, prevents leakage by reducing fluid pressure according to the shapes of the rotor and stator. It has been widely adopted to turbomachinery because no wear deliveries high efficiency, unlike to the existing contact sealing device. In this study, parametric study was performed by CFD analysis, considering helical grooved seal shape: ratio of groove width and land width (wratio), helical angle (β) and groove depth (d). Based on the leakage characteristics analyzed through CFD results, improved seal shape of the helical grooved seal to reduce leakage was suggested. 1. Introduction The helical grooved seal, which is a non-contact sealing device using the viscosity of the fluid, decreases or prevents leakage by reducing fluid pressure according to the shape of rotor and stator. It has been widely adopted to turbomachinery because no wear deliveries high efficiency, unlike to the existing contact sealing device. In the previous study, experiments on different shapes of the stator grooved seal or rotor grooved seal were performed [1-4], and numerical studies were also conducted [5-8]. Based on Ha's three-control-volume analysis method for circumferentially grooved pump seals [5], the method for the helical-grooved pump seal was derived, and the leakage characteristics according to the helix angle are compared with the experimental results of the sealing device in the helical grooved stator. As the rotating velocity of the rotor in-creased, the leakage decreased and was well matched with the results of the experiment [4, 6]. Plain seals with smooth surface of rotor and stator, and grooved seals with grooves on stator were analyzed based on a bulkflow method, and then compared with the results of the experiment [9]. There was also an attempt to compare CFD results and a regression model based on results from CFD in order to predict the performance of other helical groove seals [10]. Helical grooved shape of the rotor and that of the stator greatly influence the reduction of leakage. The existing studies con
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