elib
DLR-Header
DLR-Logo -> http://www.dlr.de
DLR Portal Home | Impressum | Datenschutz | Barrierefreiheit | Kontakt | English
Schriftgröße: [-] Text [+]

Numerical Investigation of Two-Phase Water Ejectors for High-Temperature Heat Pumps: Insights Into Flow Behavior and Shock Wave Dynamics Available to Purchase

Abu Khass, Omar Azzam Sado und Cristofaro, Marco und Kopparthy, Saketh Bharadwaj und Klöppel, Steffen und Nicke, Eberhard und Stathopoulos, Panagiotis (2025) Numerical Investigation of Two-Phase Water Ejectors for High-Temperature Heat Pumps: Insights Into Flow Behavior and Shock Wave Dynamics Available to Purchase. In: 70th ASME Turbo Expo 2025: Turbomachinery Technical Conference and Exposition, GT 2025. American Society of Mechanical Engineers (ASME). ASME Turbo Expo 2025: Turbomachinery Technical Conference and Exposition, 2025-06-16 - 2025-06-20, Memphis, Tennessee, USA. doi: 10.1115/GT2025-151706. ISBN 978-0-7918-8880-3.

[img] PDF - Nur DLR-intern zugänglich
2MB

Offizielle URL: https://doi.org/10.1115/GT2025-151706

Kurzfassung

Two-phase water ejectors can serve as a secondary steam compression mechanism in high-temperature heat pump (HTHP) systems. By integrating an ejector, high-pressure water can be combined with hot steam from the compressor, achieving simultaneous cooling and pressure increase. This integration offers the potential to reduce both the power and the number of stages required to obtain the specified compression. However, the complex flow behavior within two-phase water ejectors, especially under high-pressure, high-temperature conditions, remains insufficiently explored in the literature. This study addresses this gap by conducting a detailed numerical investigation of two-phase flow and shock wave behavior using the compressible two-phase mixture approach in computational fluid dynamics (CFD) commercial solver Ansys Fluent. The ejector geometry and critical operating points were derived from a prior study using one-dimensional (1D) analysis, which provided the design and operational conditions used in the current simulations. The ejector was modeled in two-dimensional (2D) axisymmetric configurations. The Lee model, in conjunction with the water saturation curve, was applied to capture non-equilibrium mass transfer processes, including evaporation and condensation. During the simulations, the presence of a liquid-vapor mixture may cause the speed of sound to drop, making the flow locally supersonic. Initial simulations revealed a series of shock waves in the mixing section, which elevated the mixture flow pressure to the designated set back-pressure value, thereby achieving an ejector pressure ratio of approximately 1.3. These findings provide crucial insights into how thermodynamic conditions influence two-phase flow behavior, particularly in the generation and intensity of shock waves. This work advances the modeling procedures for two-phase ejectors and enhances the understanding of the physical phenomena occurring within two-phase water ejectors designed for HTHP applications.

elib-URL des Eintrags:https://elib.dlr.de/215986/
Dokumentart:Konferenzbeitrag (Vortrag)
Titel:Numerical Investigation of Two-Phase Water Ejectors for High-Temperature Heat Pumps: Insights Into Flow Behavior and Shock Wave Dynamics Available to Purchase
Autoren:
AutorenInstitution oder E-Mail-AdresseAutoren-ORCID-iDORCID Put Code
Abu Khass, Omar Azzam SadoOmar.AbuKhass (at) dlr.dehttps://orcid.org/0009-0006-5125-8409NICHT SPEZIFIZIERT
Cristofaro, MarcoMarco.Cristofaro (at) dlr.dehttps://orcid.org/0000-0003-1421-669X192639000
Kopparthy, Saketh Bharadwajsaketh.kopparthy (at) dlr.deNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Klöppel, SteffenSteffen.Kloeppel (at) dlr.dehttps://orcid.org/0000-0002-4930-7535NICHT SPEZIFIZIERT
Nicke, EberhardEberhard.Nicke (at) dlr.deNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Stathopoulos, PanagiotisPanagiotis.Stathopoulos (at) dlr.deNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Datum:11 August 2025
Erschienen in:70th ASME Turbo Expo 2025: Turbomachinery Technical Conference and Exposition, GT 2025
Referierte Publikation:Ja
Open Access:Nein
Gold Open Access:Nein
In SCOPUS:Ja
In ISI Web of Science:Nein
DOI:10.1115/GT2025-151706
Verlag:American Society of Mechanical Engineers (ASME)
Name der Reihe:Proceedings of ASME Turbo Expo 2025: Turbomachinery Technical Conference and Exposition
ISBN:978-0-7918-8880-3
Status:veröffentlicht
Stichwörter:two-phase ejector, high-temperature heat pump, multiphase CFD simulation, steam compression
Veranstaltungstitel:ASME Turbo Expo 2025: Turbomachinery Technical Conference and Exposition
Veranstaltungsort:Memphis, Tennessee, USA
Veranstaltungsart:internationale Konferenz
Veranstaltungsbeginn:16 Juni 2025
Veranstaltungsende:20 Juni 2025
Veranstalter :The American Society of Mechanical Engineers
HGF - Forschungsbereich:Energie
HGF - Programm:Energiesystemdesign
HGF - Programmthema:Digitalisierung und Systemtechnologie
DLR - Schwerpunkt:Energie
DLR - Forschungsgebiet:E SY - Energiesystemtechnologie und -analyse
DLR - Teilgebiet (Projekt, Vorhaben):E - Energiesystemtechnologie
Standort: Zittau
Institute & Einrichtungen:Institut für CO2-arme Industrieprozesse > Hochtemperaturwärmepumpen
Institut für Softwaremethoden zur Produkt-Virtualisierung > Hochleistungsrechnen
Hinterlegt von: Abu Khass, Omar Azzam Sado
Hinterlegt am:24 Sep 2025 16:24
Letzte Änderung:24 Sep 2025 16:24

Nur für Mitarbeiter des Archivs: Kontrollseite des Eintrags

Blättern
Suchen
Hilfe & Kontakt
Informationen
OpenAIRE Validator logo electronic library verwendet EPrints 3.3.12
Gestaltung Webseite und Datenbank: Copyright © Deutsches Zentrum für Luft- und Raumfahrt (DLR). Alle Rechte vorbehalten.