Book ChapterDOI
Numerical Investigation of Supersonic Dense-Gas Boundary Layers
Luca Sciacovelli,Donatella Passiatore,Xavier Gloerfelt,Paola Cinnella,Francesco Grasso +4 more
- pp 91-103
TLDR
In this paper, a study of dense-gas effects on the laminar, transitional and turbulent characteristics of boundary layer flows is conducted, which shows that temperature variations are small due to the high specific heats of dense gases, leading to velocity profiles close to the incompressible ones.Abstract:
A study of dense-gas effects on the laminar, transitional and turbulent characteristics of boundary layer flows is conducted. The laminar similarity solution shows that temperature variations are small due to the high specific heats of dense gases, leading to velocity profiles close to the incompressible ones. Nevertheless, the complex thermodynamics of the base flow has a major impact on unstable modes, which bear similarities with those obtained for a strongly cooled wall. Numerical simulations of spatially developing boundary layers yield turbulent statistics for the dense gas flow that remain closer to the incompressible regime than perfect gas ones despite the presence of strongly compressible structures.read more
References
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Journal ArticleDOI
Direct simulation of a turbulent boundary layer up to R sub theta = 1410
TL;DR: In this paper, the turbulent boundary layer on a flat plate, with zero pressure gradient, is simulated numerically at four stations between R sub theta = 225 and R sub tta = 1410.
Boundary-Layer Linear Stability Theory
TL;DR: In this paper, the amplitude ratio of the most amplified frequency as a function of Reynolds number for a Blasius boundary layer, and found that this quantity had values between five and nine at the observed Ret.
Journal ArticleDOI
Assessment of direct numerical simulation data of turbulent boundary layers
Philipp Schlatter,Ramis Örlü +1 more
TL;DR: In this paper, statistics obtained from seven different direct numerical simulations (DNSs) pertaining to a canonical turbulent boundary layer (TBL) under zero pressure gradient are compiled and compared, and the resulting comparison shows surprisingly large differences not only in both basic integral quantities such as the friction coefficient or the shape factor H12, but also in their predictions of mean and fluctuation profiles far into the sublayer.
Journal ArticleDOI
Direct numerical simulation and analysis of a spatially evolving supersonic turbulent boundary layer at M=2.25
TL;DR: In this article, a spatially developing supersonic adiabatic flat plate boundary layer flow (at M∞=2.25 and Reθ≈4000) is analyzed by means of direct numerical simulation.
Journal ArticleDOI
Organic Rankine Cycle Power Systems: From the Concept to Current Technology, Applications, and an Outlook to the Future
Piero Colonna,Emiliano Casati,Carsten Trapp,Tiemo Mathijssen,Jaakko Larjola,Teemu Turunen-Saaresti,Antti Uusitalo +6 more
TL;DR: The cumulative global capacity of organic Rankine cycle (ORC) power systems for the conversion of renewable and waste thermal energy is undergoing a rapid growth and is estimated to be approx. 2000 MWe considering only installations that went into operation after 1995 as mentioned in this paper.