Source term based modeling of rotating cavitation in turbopumps

Adam Vermes, Claudio Lettieri

Research output: Chapter in Book/Conference proceedings/Edited volumeConference contributionScientificpeer-review

Abstract

The recent growth of private options in launch vehicles has substantially raised price competition in the space launch market. This has increased the need to deliver reliable launch vehicles at reduced engine development cost, and has led to increased industrial interest in reduced order models. Large - scale liquid rocket engines require high - speed turbopumps to inject cryogenic propellants into the combustion chamber. These pumps can experience cavitation instabilities even when operating near design conditions. Of particular concern is rotating cavitation, which is characterized by an asymmetric cavity rotati ng a t the pump inlet , which can cause severe vibration, breaking of the pump and loss of the mission. Despite much work in the field, there are limited guidelines to avoid rotating cavitation during design and its occurrence is often assessed through costl y experimental testing. This paper presents a source term based model for stability assessment of rocket engine turbopumps. The approach utilizes mass and momentum source terms to model cavities and hydrodynamic blockage in inviscid, single - phase numerica l calculations, reducing the computational cost of the calculations by an order of magnitude compared to traditional numerical methods. Comparison of the results from the model with experiments and high - fidelity calculations indicates agreement of the head coefficient and cavity blockage within 0.26% and 5% respectively. The computations capture rotating cavitation in a 2D inducer at the expected flow coefficient and cavitation number. The mechanism of formation and propagation of the instability is correct ly reproduced .
Original languageEnglish
Title of host publicationASME 2018 Turbo Expo Turbomachinery Technical Conference & Exposition
Subtitle of host publicationJune 11-15, 2018, Oslo, Norway
PublisherASME
Number of pages11
Volume2C-2018
ISBN (Print)9780791851012
DOIs
Publication statusPublished - 2018
EventASME Turbo Expo 2018: Turbomachinery Technical Conference and Exposition, GT 2018: Turbomachinery Technical Conference and Exposition - Norway Exhibition and Convention Centre, Oslo, Norway
Duration: 11 Jun 201815 Jun 2018
Conference number: 63
https://www.asme.org/events/turbo-expo

Conference

ConferenceASME Turbo Expo 2018: Turbomachinery Technical Conference and Exposition, GT 2018
CountryNorway
CityOslo
Period11/06/1815/06/18
Internet address

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  • Cite this

    Vermes, A., & Lettieri, C. (2018). Source term based modeling of rotating cavitation in turbopumps. In ASME 2018 Turbo Expo Turbomachinery Technical Conference & Exposition: June 11-15, 2018, Oslo, Norway (Vol. 2C-2018). [GT2018-75194] ASME. https://doi.org/10.1115/GT201875194