scholarly journals Drag on an Oscillating Airfoil in a Fluctuating Free Stream

1979 ◽  
Vol 101 (3) ◽  
pp. 391-399 ◽  
Author(s):  
S. B. R. Kottapalli ◽  
G. Alvin Pierce
Keyword(s):  
Boundary Layer ◽  
Analytical Study ◽  
Free Stream ◽  
Time Dependent ◽  
Friction Drag ◽  
Boundary Layer Analysis ◽  
Reduced Frequency ◽  
Layer Analysis ◽  
Flow Pressure ◽  
Oscillating Airfoil

An analytical study is presented regarding the unsteady skin friction drag of an oscillating airfoil exposed to a fluctuating free stream speed. Both laminar and turbulent conditions are covered in the analysis. The unsteady potential flow pressure and velocity distributions required for the subsequent boundary layer analysis are obtained by an approximate development. The time-dependent boundary layer is solved by a finite difference scheme. It was found that depending on the values of the phase difference between free stream fluctuations and airfoil oscillations, reduced frequency, and amplitude of free stream fluctuations, the drag can either lead or lag the free stream.

Boundary layer analysis of ventilated partial cavity for friction drag reduction

2021 ◽  
Vol 239 ◽  
pp. 109799
Author(s):  
Luyao Wang ◽  
Shijie Qin ◽  
Hezhen Fang ◽  
Dazhuan Wu ◽  
Bin Huang ◽  
...  
Keyword(s):  
Boundary Layer ◽  
Drag Reduction ◽  
Friction Drag ◽  
Boundary Layer Analysis ◽  
Layer Analysis ◽  
Friction Drag Reduction

scholarly journals Boundary layer analysis and heat transfer of a nanofluid

2014 ◽  
Vol 17 (2) ◽  
pp. 401-412 ◽  
Author(s):  
M. M. MacDevette ◽  
T. G. Myers ◽  
B. Wetton
Keyword(s):  
Heat Transfer ◽  
Boundary Layer ◽  
Boundary Layer Analysis ◽  
Layer Analysis

A Systematic Computational Design System for Turbine Cascades, Airfoil Geometry and Blade-to-Blade Analysis

1983 ◽  
Author(s):  
Z.-Q. Ye
Keyword(s):  
Boundary Layer ◽  
Leading Edge ◽  
Computational Design ◽  
Design System ◽  
Finite Area ◽  
Streamline Curvature ◽  
Boundary Layer Analysis ◽  
Curvature Analysis ◽  
Layer Analysis ◽  
Turbine Cascades

This paper describes a systematic computational design system for two-dimensional turbine cascades. The system includes a sequence of calculations in which airfoil profiles are designed from velocity diagram requirements and specified geometric parameters, followed by an inviscid global streamline curvature analysis, a magnified reanalysis around the leading edge, and a transitional profile boundary layer and wake mixing analysis. A finite area technique and a body-fitted mesh are used for the reanalysis. The boundary layer analysis is performed using the dissipation-integral method of Walz which has been modified in the present application. Several turbine airfoil profile geometry designs are presented. Also two sample cascade design cases and their calculated performance for a range of Mach numbers and incidence angles are given and discussed.

Boundary Layer Analysis of Exothermic and Endothermic Kind of Chemical Reaction in the Flow of Non-Darcian Unsteady Micropolar Fluid along an Infinite Vertical Surface

2017 ◽  
Vol 28 ◽  
pp. 90-101 ◽  
Author(s):  
O.K. Koriko ◽  
A.J. Omowaye ◽  
Isaac Lare Animasaun ◽  
Idris O. Babatunde
Keyword(s):  
Boundary Layer ◽  
Differential Equations ◽  
Chemical Reaction ◽  
Micropolar Fluid ◽  
Local Heat Transfer ◽  
Flow Region ◽  
Local Similarity ◽  
Suction Parameter ◽  
Boundary Layer Analysis ◽  
Layer Analysis

The problem of unsteady non – Newtonian flow past a vertical porous surface in the presence of thermal radiation is investigated. Using the theory of boundary layer analysis, the flow of micropolar fluid in the presence of exothermic and endothermic kind of chemical reaction is considered. It is assumed that the relationship between the flow rate and the pressure drop as the fluid flows over a porous medium is non – linear. Using local similarity transformation, the governing partial differential equations of the physical model are reduced to ordinary differential equations. The corresponding boundary value problem is solved numerically using shooting method along with Runge-Kutta Gill method together with quadratic interpolation. It is found that increase in micro-rotation parameter increases the velocity while the micro- rotation decreases across the flow region. Maximum micro-rotation of tiny particles is guaranteed at higher values of suction parameter. Local heat transfer rate decreases with an increase in exothermic /endothermic parameter.

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