Secondary flow choking in axisymmetric supersonic air ejector with adjustable motive nozzle

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F46747885%3A24210%2F22%3A00009323" target="_blank" >RIV/46747885:24210/22:00009323 - isvavai.cz</a>

Výsledek na webu

<a href="https://www.sciencedirect.com/science/article/pii/S1359431121013570" target="_blank" >https://www.sciencedirect.com/science/article/pii/S1359431121013570</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.applthermaleng.2021.117936" target="_blank" >10.1016/j.applthermaleng.2021.117936</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Secondary flow choking in axisymmetric supersonic air ejector with adjustable motive nozzle

Popis výsledku v původním jazyce

Supersonic ejectors have many applications across engineering, but their broader utilization is prevented by their generally low efficiency, which is related to a lack of understanding of the processes within them. This paper presents experimental and numerical analyses of the choking phenomenon within an axisymmetric supersonic air ejector with an adjustable motive nozzle. The effects of the operating and geometric conditions on the flow within the ejector were studied in detail. Five motive nozzle configurations were considered, and the results showed that the specific nozzle position (xp) could be changed to influence the choking of the secondary flow and hence achieve different working regimes while keeping the operating conditions constant. At xp = 1 or 2 mm, the secondary flow reached sonic conditions before even entering the mixing chamber and therefore before mixing with the primary flow. At xp = 3–5 mm, choking occurred within the mixing chamber, and two different choking mechanisms were identified. These results may serve as background for better understanding of flow choking in supersonic ejectors.

Název v anglickém jazyce

Secondary flow choking in axisymmetric supersonic air ejector with adjustable motive nozzle

Popis výsledku anglicky

Supersonic ejectors have many applications across engineering, but their broader utilization is prevented by their generally low efficiency, which is related to a lack of understanding of the processes within them. This paper presents experimental and numerical analyses of the choking phenomenon within an axisymmetric supersonic air ejector with an adjustable motive nozzle. The effects of the operating and geometric conditions on the flow within the ejector were studied in detail. Five motive nozzle configurations were considered, and the results showed that the specific nozzle position (xp) could be changed to influence the choking of the secondary flow and hence achieve different working regimes while keeping the operating conditions constant. At xp = 1 or 2 mm, the secondary flow reached sonic conditions before even entering the mixing chamber and therefore before mixing with the primary flow. At xp = 3–5 mm, choking occurred within the mixing chamber, and two different choking mechanisms were identified. These results may serve as background for better understanding of flow choking in supersonic ejectors.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

20303 - Thermodynamics

Projekt

—

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2022

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Applied Thermal Engineering

ISSN

1359-4311

e-ISSN

—

Svazek periodika

204

Číslo periodika v rámci svazku

March

Stát vydavatele periodika

GB - Spojené království Velké Británie a Severního Irska

Počet stran výsledku

17

Strana od-do

—

Kód UT WoS článku

000742674900003

EID výsledku v databázi Scopus

2-s2.0-85121977828