TRANSACTIONS OF THE KRYLOV STATE RESEARCH CENTRE

Science journal

 
ISSN (print) 2542-2324 /(online) 2618-8244


Articles of The Transactions of KSRC








Confuser and diffuser shape optimization for cavitation tunnels with non-circular section.



Full text article ( in russian)

Year

 
2018

Issue

 
384

Volume

 
2

Pages

 
39-48

Caption

 
Confuser and diffuser shape optimization for cavitation tunnels with non-circular section.

Authors

 
Yakovlev A., Lobova A.

Keywords

 
cavitation tunnel, confuser, diffuser, optimization, computational fluid mechanics, cavitation, flow non-uniformity.

DOI

 
10.24937/2542-2324-2018-2-384-39-48

Summary

 
Object and purpose of research.This paper studies confuser and diffuser shapes of cavitation tunnels with almost rectangular (non-circular) cross-section. The purpose of this work is to develop optimization method for confuser and diffuser shape, so as to ensure the best performance of cavitation tunnel with specified size restrictions
Subject matter and methodsTo select confuser and diffuser shapes basically means to solve a number of plane optimization problems for several longitudinal sections. This is done by means of previously developed method for solving inverse problems in non-viscous fluid. Quality control of the confuser and diffuser shapes obtained after optimization is performed through calculation of 3D flow in a commercial CFD package, using k-ω SST turbulence model.
Main results.The optimization method for confusers and diffusers of cavitation tunnel was developed, verified and validated. It was shown that this method yields better diffuser and confuser shapes, as compared to the solutions commonly used in practice. This method was applied in development of confuser and diffuser for a cavitation tunnel, and it has been demonstrated that performance parameters of this tunnel will be at the levels of its best foreign counterparts. CFD-calculation of the flow was performed for the duct of the cavitation tunnel, including confuser, diffuser and test section. The results of this calculation were demonstrated to correlate well with those obtained as per the newly developed method. Separation-free flow at the tunnel walls has been confirmed.
Conclusion.It was established that currently used shapes of confusers and diffusers for cavitation tunnels are not optimal. The calculation method developed by KSRC yields their optimal shape, eventually ensuring development of cavitation tunnels that would be at the level of their best foreign counterparts

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ISSN (print) 2542-2324 / ISSN (online) 2618-8244

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