CFD investigation of shock boundary layer interaction in hypersonic flow and flow control using micro ramps

2022-01-01
Gupta, Gautam
Kumar, Akshay Ashok
Sivakumar, R.
Jayaraman, Kandasamy
Purpose This study aims to investigate the prevalence of shock boundary layer interaction (SBLI) in air-breathing intake system is highly undesirable since this leads to high pressure gradients, typical stream mutilation and pressure drop. A novel flow control mechanism is incorporated in this research holding an array configuration of passive flow control device (micro ramps [MR]) that is adapted to improve the boundary layer stability. Design/methodology/approach Two geometric variants of the MR, namely, MR40 and MR80 is considered which reduce the pressure drop during SBLI. The incidence oblique shock wave angle of 34 degrees is considered for the modelling. Large eddy simulation (LES) turbulence model was used with subgrid models of Wall modelled LES, Smagorinsky-Lilly to compute the unsteady effects of SBLI control using micro vortex generators. The unsteady results are compared with steady Reynold's average Naviers-Stoke's equation for calibrating the turbulence models. Findings The array configuration of MR80 reduces the pressure drop by 22% as compared with no ramp configuration and also reduces the flow distortion in hypersonic inlet. The most affected region of the MR is in the vicinity of center-line. Quantitative results prove that the upstream influence of the shock waves has been largely reduces by MR80 array configuration as compared to single MR80 pattern configuration. Different vortex structures found in the experiments was exclusively predicted using LES. Originality/value This paper substantiates the requirement of MR array configuration for transferring the momentum from free stream to the boundary layer and thereby energizing the boundary layer. This process of energization delays the flow separation in hypersonic flow.
AIRCRAFT ENGINEERING AND AEROSPACE TECHNOLOGY

Suggestions

CFD Simulations of Hydrodynamics of Conical Spouted Bed Nuclear Fuel Coaters
Lule, Senem Senturk; Çolak, Üner; KÖKSAL, MURAT; Külah, Görkem (2015-06-01)
The ability of the two fluid method (TFM) to predict the gas-solid flow phenomenon in conical spouted beds operated with high density (6050kgm(-3)) particles simulating the nuclear fuel coating conditions is investigated. The effects of geometric and operational factors, such as conical angle and static bed height, are also assessed. The results show that TFM predicts the time-averaged bed pressure drop quite well. The qualitative variation of the particle velocity, solids volume fraction, and axial particl...
CFD simulation of the developing boundary layer in an atmospheric wind tunnel
Kıran, Defne; Aksel, Mehmet Haluk; Çete, Ali Ruhşen; Department of Mechanical Engineering (2018)
Structural coupling methods are widely used in predicting dynamics of coupled systems. In this study, the reverse problem, i.e. predicting the dynamic behavior of a particular subsystem from the knowledge of the dynamics of the overall system and of all the other subsystems, is studied. This problem arises when a substructure cannot be measured separately, but only when coupled to neighboring substructures. The dynamic decoupling problem of coupled linear structures is well investigated in literature. Howev...
Synthesis and characterization of bulk glass-forming iron-boron based alloy systems
Gürbüz, Selen Nimet; Akdeniz, Mahmut Vedat; Department of Metallurgical and Materials Engineering (2004)
The aim of this study, which was carried out in two main parts, is to investigate the glass forming ability of Fe-based systems. The first part involves the theoretical modeling to cover the requirement of a predictive model to identify the Fe-based alloy families that have high glass forming ability in the frame of atomistic and thermodynamic approach. The second part involves the experimental investigations to prove the results of the conducted theoretical modeling studies. For this purpose, in the first ...
Formation of air-entraining vortices at horizontal intakes without approach flow induced circulation
Göğüş, Mustafa; Köken, Mete (2016-02-01)
The aim of this experimental study is to investigate the effects of hydraulic parameters on the formation of air-entraining vortices at horizontal intake structures without approach flow induced circulation. Six intake pipes of different diameters were tested in the study. The intake pipe to be tested was horizontally mounted to the front side of a large reservoir and then for a wide range of discharges experiments were conducted and critical submergences were detected with adjustable approach channel sidew...
CPT-Based Probabilistic Soil Characterization and Classification
Çetin, Kemal Önder (American Society of Civil Engineers (ASCE), 2009-01-01)
Due to lack of soil sampling during conventional cone penetration testing, it is necessary to characterize and classify soils based on tip and sleeve friction values as well as pore pressure induced during and after penetration. Currently available semiempirical methods exhibit a significant variability in the estimation of soil type. Within the confines of this paper it is attempted to present a new probabilistic cone penetration test (CPT)-based soil characterization and classification methodology, which ...
Citation Formats
G. Gupta, A. A. Kumar, R. Sivakumar, and K. Jayaraman, “CFD investigation of shock boundary layer interaction in hypersonic flow and flow control using micro ramps,” AIRCRAFT ENGINEERING AND AEROSPACE TECHNOLOGY, pp. 0–0, 2022, Accessed: 00, 2022. [Online]. Available: https://hdl.handle.net/11511/96008.