One-equation turbulence models applied to practical scramjet inlet-Reference-Cited by-同舟云学术

One-equation turbulence models applied to practical scramjet inlet

Published:2021-06-04 Issue:0 Volume:0 Page:
ISSN:2191-0332
Container-title:International Journal of Turbo & Jet-Engines
language:en
Short-container-title:

Author:

Pasha Amjad A.¹^ORCID,Juhany Khalid A.¹,Pillai Subramania N.²

Affiliation:

1. Aerospace Engineering Department , King Abdulaziz University , Jeddah 21589 , Saudi Arabia

2. Turbulence and Flow Control Lab , School of Mechanical Engineering, SASTRA Deemed University , Thanjavur 613401 , Tamil Nadu , India

Abstract

Abstract Reynolds-averaged Navier–Stokes equations are used to simulate a practical scramjet inlet geometry using the shock-unsteadiness modified Spalart–Allmaras (SA) turbulence model. The geometry consists of fore-body ramps, expansion corners, and inlet ducts. The focus is to study the impingement of the cowl shock on the opposite wall boundary-layer. The resulting separation bubble can lead to blockage and inlet unstarts. The shock-unsteadiness correction is employed and is found to improve the computational fluid dynamics (CFD) prediction of flow separation in shock/boundary-layer interactions. The shock-unsteadiness parameter is calibrated against available experimental data of canonical flows, and the predicted flow-field is analyzed in detail. A large separation bubble size normalized to the upstream boundary-layer thickness of 4.6 is observed in the interaction region. Across the reattachment region in the interaction region, a peak value of wall pressure is observed. The inlet performance parameters are also calculated. The total pressure losses of 62% are observed across different shock waves, with an additional loss of 15% due to viscous boundary-layer effects.

Publisher

Walter de Gruyter GmbH

Subject

Aerospace Engineering

Link

https://www.degruyter.com/document/doi/10.1515/tjeng-2021-0013/pdf

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