Studies on Unsteady Laminar-Turbulent Transition Caused by Wakes in Turbine Rotor-Stator Interaction Based on a Hybrid-LES Model

2005 ◽  
Author(s):  
Debasish Biswas
Keyword(s):  
Turbine Rotor ◽  
Turbulent Transition ◽  
Rotor Stator Interaction ◽  
Les Model ◽  
Laminar Turbulent Transition

Aerodynamic Optimization of an Impulse Turbine Cascade Including Laminar/Turbulent Transition Prediction

2010 ◽  
Author(s):  
Ernesto Benini ◽  
Claudio Comis da Ronco ◽  
Rita Ponza
Keyword(s):  
Total Pressure ◽  
Pressure Coefficient ◽  
Optimization Procedure ◽  
Turbine Rotor ◽  
Aerodynamic Optimization ◽  
Impulse Turbine ◽  
Pressure Losses ◽  
Transition Prediction ◽  
Turbulent Transition ◽  
Laminar Turbulent Transition

Aerodynamic optimization of an impulse turbine rotor cascade is described in this paper. The aim of the optimization is to minimize the total pressure losses through the cascade by reshaping the turbine airfoil. For a more realistic calculation of the boundary layer and the associated losses, laminar/turbulent transition is computed by means of the commercial CFD code Fluent. The solver underwent an accurate validation before it is inserted into the optimization loop. A proper optimization procedure is developed which is based on a sequential use of two modules: first, a global search is performed using a genetic algorithm, then a local optimization is carried out by means of a Sequential Quadratic Programming (SQP) algorithm. The benefits of this approach are demonstrated, in that the total pressure coefficient of the cascade can be lowered up to 25%.

ESTIMATION OF THE EFFECT OF FREE-STREAM TURBULENCE AND SOLID PARTICLES ON THE LAMINAR-TURBULENT TRANSITION AT HYPERSONIC SPEEDS

2016 ◽  
Vol 47 (1) ◽  
pp. 15-28 ◽  
Author(s):  
Mikhail Aleksandrovich Pugach ◽  
Alexander Aleksandrovich Ryzhov ◽  
Alexander Vitalievich Fedorov
Keyword(s):  
Free Stream ◽  
Solid Particles ◽  
Free Stream Turbulence ◽  
Turbulent Transition ◽  
Hypersonic Speeds ◽  
Laminar Turbulent Transition

INFLUENCE OF THE PLATE LEADING-EDGE SHAPE AND THICKNESS ON THE BOUNDARY LAYER LAMINAR-TURBULENT TRANSITION IN HYPERSONIC FLOW

2019 ◽  
Vol 50 (5) ◽  
pp. 461-481
Author(s):  
Sergei Vasilyevich Aleksandrov ◽  
Evgeniya Andreevna Aleksandrova ◽  
Volf Ya. Borovoy ◽  
Andrey Vyacheslavovich Gubernatenko ◽  
Vladimir Evguenyevich Mosharov ◽  
...  
Keyword(s):  
Boundary Layer ◽  
Hypersonic Flow ◽  
Leading Edge ◽  
Turbulent Transition ◽  
Laminar Turbulent Transition

LAMINAR-TURBULENT TRANSITION ON THE LV6 LAMINARIZED AIRFOIL. PART II: EFFECT OF FREE STREAM DISTURBANCES

2011 ◽  
Vol 42 (6) ◽  
pp. 729-756
Author(s):  
Vadim Anatol'evich Vlasov ◽  
Sergey Vadimovich Zhigulev ◽  
Aleksandr Igorevich Ivanov ◽  
Andrey Filippovich Kiselev ◽  
Vladimir Aleksandrovich Kuzminsky ◽  
...  
Keyword(s):  
Free Stream ◽  
Turbulent Transition ◽  
Laminar Turbulent Transition
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