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Author: Kanika Gakhar Publisher: ISBN: Category : Languages : en Pages : 201
Book Description
This thesis describes an analysis of the effect of freestream turbulence (FST) on turbulent boundary layer loss generation. A relation has been derived between a turbulence parameter, which characterizes the FST, and the increase in boundary layer dissipation coefficient. The relation gives guidelines for trade studies, for example between combustor turbulence properties and turbine performance in a typical gas turbine engine. Based on the FST length-scale, two regimes of FST influence have been defined, with consequent different functional dependencies between FST parameters and boundary layer dissipation coefficient. In one regime, characterized by self-similarity of mean velocity and turbulence production profiles, the dissipation coefficient is a function of local parameters, and can be determined using measurement data for effects of FST on skin-friction. In the second regime, the boundary layer deviates from equilibrium due to the lag between the rate of turbulence production and dissipation. For this latter case, a method has been developed to estimate the effect of FST on dissipation using a modified shear-lag model, based on the conservation of turbulent kinetic energy. This thesis shows that the increase in boundary layer loss due to local FST can be as high as 73%, and that non-equilibrium effects can result in an additional increase in boundary layer loss as high as 8%. Finally, the framework developed in this thesis has also been applied to an industry relevant situation, quantifying the effect of combustor turbulence on high pressure turbine (HPT) performance. Example trade studies show that increasing the size of dilution ports, increasing the length of the combustor, and rearranging or re-orienting the dilution jets in cross-flow in the combustor all can help decrease HPT profile loss generation, and potentially increase stage efficiency up to 0.5%.
Author: Kanika Gakhar Publisher: ISBN: Category : Languages : en Pages : 201
Book Description
This thesis describes an analysis of the effect of freestream turbulence (FST) on turbulent boundary layer loss generation. A relation has been derived between a turbulence parameter, which characterizes the FST, and the increase in boundary layer dissipation coefficient. The relation gives guidelines for trade studies, for example between combustor turbulence properties and turbine performance in a typical gas turbine engine. Based on the FST length-scale, two regimes of FST influence have been defined, with consequent different functional dependencies between FST parameters and boundary layer dissipation coefficient. In one regime, characterized by self-similarity of mean velocity and turbulence production profiles, the dissipation coefficient is a function of local parameters, and can be determined using measurement data for effects of FST on skin-friction. In the second regime, the boundary layer deviates from equilibrium due to the lag between the rate of turbulence production and dissipation. For this latter case, a method has been developed to estimate the effect of FST on dissipation using a modified shear-lag model, based on the conservation of turbulent kinetic energy. This thesis shows that the increase in boundary layer loss due to local FST can be as high as 73%, and that non-equilibrium effects can result in an additional increase in boundary layer loss as high as 8%. Finally, the framework developed in this thesis has also been applied to an industry relevant situation, quantifying the effect of combustor turbulence on high pressure turbine (HPT) performance. Example trade studies show that increasing the size of dilution ports, increasing the length of the combustor, and rearranging or re-orienting the dilution jets in cross-flow in the combustor all can help decrease HPT profile loss generation, and potentially increase stage efficiency up to 0.5%.
Author: Salman Absar Publisher: ISBN: Category : Languages : en Pages : 283
Book Description
The present study shows the effects of high freestream turbulence on the performance of a two dimensional cascade. The cascade consisted of seven NACA 65-A506 airfoils with two inches chord. Experiments were carried out at flow Reynolds number per foot in excess of two and a half million. Flow turbulence intensity of 7% was generated upstream of the cascade. Blades with three different categories of surface roughness were studied. High freestream turbulence results in a decrease in total pressure loss coefficient in the cascade and an increase in the total pressure loss coefficient in the wake. The results also show an increase in pressure coefficient, over the suction surface, independent of the amount of surface roughness. The boundary layer thickness, after 50% chord, increases substantially, with an increase in freestream turbulence. This effect is aggravated with higher surface roughness. The effects of high freestream turbulence on boundary layer edge velocity are sensitive to local surface roughness. With low surface roughness, the boundary layer edge velocity increase with freestream turbulence. The results indicate an opposite effect when local surface roughness is increased.
Author: Kanika Gakhar
Author: Kanika Gakhar
Author: S. J. Leib
Author: Haribhajan Singh Kocher
Author: Salman Absar
Author: Alexander Vladimir Lisin
Author: Th Herbert
Author: 
Author: Irshad Hussain Syed
Author: Stanford University. Thermosciences Division
Author: Isabella Fumarola