scholarly journals Numerical Investigation Of Surface Roughness Effects On The Flow Field In A Swirl Flow

2014 ◽  
Vol 19 (2) ◽  
pp. 1 ◽  
Author(s):  
Ali SAKİN ◽  
İrfan KARAGÖZ
Keyword(s):  
Surface Roughness ◽  
Flow Field ◽  
Numerical Investigation ◽  
Swirl Flow ◽  
Roughness Effects

Numerical investigation of the surface roughness effects on the subsonic flow around a circular cone-cylinder

2020 ◽  
Vol 107 ◽  
pp. 106271
Author(s):  
Noureddine Saidi ◽  
Mahfoudh Cerdoun ◽  
Smail Khalfallah ◽  
Toufik Belmrabet
Keyword(s):  
Surface Roughness ◽  
Numerical Investigation ◽  
Subsonic Flow ◽  
Circular Cone ◽  
Roughness Effects

scholarly journals Numerical investigation of surface roughness effects on heat transfer in a turbine cascade

2019 ◽  
Author(s):  
Arunprasath Subramanian ◽  
Andrea Gamannossi ◽  
Lorenzo Mazzei ◽  
Antonio Andreini
Keyword(s):  
Heat Transfer ◽  
Surface Roughness ◽  
Numerical Investigation ◽  
Turbine Cascade ◽  
Roughness Effects

Impact of Swirl Flow on Combustor Liner Heat Transfer and Cooling: A Numerical Investigation With Hybrid RANS-LES Models

2015 ◽  
Author(s):  
L. Mazzei ◽  
A. Andreini ◽  
B. Facchini ◽  
F. Turrini
Keyword(s):  
Heat Transfer ◽  
Flow Field ◽  
Numerical Investigation ◽  
Film Cooling ◽  
Swirling Flow ◽  
Cooling System ◽  
Swirl Flow ◽  
Opening Angle ◽  
Lean Burn ◽  
Combustor Liner

This paper reports the main findings of a numerical investigation aimed at characterizing the flow field and the wall heat transfer resulting from the interaction of a swirling flow provided by lean burn injectors and a slot cooling system, which generates film cooling in the first part of the combustor liner. In order to overcome some well-known limitations of RANS approach, e.g. the underestimation of mixing, the simulations were performed with hybrid RANS-LES models, namely SAS-SST and DES-SST, which are proving to be a viable approach to resolve the main structures of the flow field. The numerical results were compared to experimental data obtained on a non-reactive three sector planar rig developed in the context of the EU project LEMCOTEC. The analysis of the flow field has highlighted a generally good agreement against PIV measurements, especially for the SAS-SST model, whereas DES-SST returns some discrepancies in the opening angle of the swirling flow, altering the location of the corner vortex. Also the assessment in terms of Nu/Nu0 distribution confirms the overall accuracy of SAS-SST, where a constant over-prediction in the magnitude of the heat transfer is shown by DES-SST, even though potential improvements with mesh refinement are pointed out.

scholarly journals Numerical Investigation of Flow Field Near the Exhaust Opening Indoor

2019 ◽  
Vol 267 ◽  
pp. 032081
Author(s):  
Chanjun Meng ◽  
Bo Yuan ◽  
Chuan He ◽  
Chunfu Xi ◽  
Liangming Pan
Keyword(s):  
Flow Field ◽  
Numerical Investigation

Numerical simulation of swirling flow effect on the first stage vane film cooling distribution

2016 ◽  
Vol 07 (03) ◽  
pp. 1650031
Author(s):  
Hong Yin
Keyword(s):  
Flow Field ◽  
Film Cooling ◽  
Swirling Flow ◽  
Cooling System ◽  
Leading Edge ◽  
Suction Side ◽  
Local Area ◽  
Swirl Flow ◽  
Flow Effect ◽  
Recirculation Flow

In advanced gas turbine technology, lean premixed combustion is an effective strategy to reduce peak temperature and thus, NO[Formula: see text] emissions. The swirler is adopted to establish recirculation flow zone, enhancing mixing and stabilizing the flame. Therefore, the swirling flow is dominant in the combustor flow field and has impact on the vane. This paper mainly investigates the swirling flow effect on the turbine first stage vane cooling system by conducting a group of numerical simulations. Firstly, the numerical methods of turbulence modeling using RANS and LES are compared. The computational model of one single swirl flow field is considered. Both the RANS and LES results give reasonable recirculation zone shape. When comparing the velocity distribution, the RANS results generally match the experimental data but fail to at some local area. The LES modeling gives better results and more detailed unsteady flow field. In the second step, the RANS modeling is incorporated to investigate the vane film cooling performance under the swirling inflow boundary condition. According to the numerical results, the leading edge film cooling is largely altered by the swirling flow, especially for the swirl core-leading edge aligned case. Compared to the pressure side, the suction side film cooling is more sensitive to the swirling flow. Locally, the film cooling jet is lifted and turned by the strong swirling flow.

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