Effect of wall roughness on secondary flow choking in 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%2F23%3A00011180" target="_blank" >RIV/46747885:24210/23:00011180 - isvavai.cz</a>

Výsledek na webu

<a href="https://www.sciencedirect.com/science/article/pii/S0142727X2300067X" target="_blank" >https://www.sciencedirect.com/science/article/pii/S0142727X2300067X</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.ijheatfluidflow.2023.109168" target="_blank" >10.1016/j.ijheatfluidflow.2023.109168</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Effect of wall roughness on secondary flow choking in supersonic air ejector with adjustable motive nozzle

Popis výsledku v původním jazyce

Wall roughness is present to a certain extent in all engineering devices and systems. However, it is rarely considered during numerical simulations of supersonic ejectors. In this study, the effect of wall roughness on choking within a supersonic ejector with an adjustable motive nozzle was investigated in detail. Wall roughness was studied through numerical simulations. Characteristic curves showed that roughness had almost no influence on secondary flow choking when choking occured geometrically before the mixing chamber. By contrast, when choking occurred within the mixing chamber, its phenomenology was significantly altered by wall roughness. In addition, the results confirmed the ability of an ejector to switch from the on-design working regime to the off-design one when wall roughness is considered. The numerical results were also compared with available experimental data. Accounting for wall roughness in the numerical analysis significantly improved the agreement between the experimental and numerical data, especially in terms of wall static pressure distributions. This study sheds light on secondary flow choking within a supersonic ejector considering wall roughness.

Název v anglickém jazyce

Effect of wall roughness on secondary flow choking in supersonic air ejector with adjustable motive nozzle

Popis výsledku anglicky

Wall roughness is present to a certain extent in all engineering devices and systems. However, it is rarely considered during numerical simulations of supersonic ejectors. In this study, the effect of wall roughness on choking within a supersonic ejector with an adjustable motive nozzle was investigated in detail. Wall roughness was studied through numerical simulations. Characteristic curves showed that roughness had almost no influence on secondary flow choking when choking occured geometrically before the mixing chamber. By contrast, when choking occurred within the mixing chamber, its phenomenology was significantly altered by wall roughness. In addition, the results confirmed the ability of an ejector to switch from the on-design working regime to the off-design one when wall roughness is considered. The numerical results were also compared with available experimental data. Accounting for wall roughness in the numerical analysis significantly improved the agreement between the experimental and numerical data, especially in terms of wall static pressure distributions. This study sheds light on secondary flow choking within a supersonic ejector considering wall roughness.

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

2023

Kód důvěrnosti údajů

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

Název periodika

International Journal of Heat and Fluid Flow

ISSN

0142-727X

e-ISSN

—

Svazek periodika

103

Číslo periodika v rámci svazku

OCT

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

15

Strana od-do

—

Kód UT WoS článku

001036810300001

EID výsledku v databázi Scopus

2-s2.0-85162228005