We optimize the locations and levels of these cooling strips for a certain hump location. Moreover, cooling through multiple strips is as effective as cooling through a single strip. We optimize the locations of these strips for a certain hump location. Also the total flow rate required using multiple strips is less than that required using a single strip. Golf balls are given underspin and as a result of the boundary layer interaction with the surrounding air and Bernoulli effect, they experience aerodynamic lift. Applying suction through multiple strips can be as effective as continuous suction. Moreover, a heating strip destabilizes the flow in the presence of a hump. The results show that cooling and suction strips stabilize the flow and therefore delay transition from laminar to turbulent flow. The influence of suction and heat-transfer strips on controlling the destabilizing influence of the hump is investigated. Moreover, the amplification factor increases as the hump height increases and as the hump is moved downstream. Also this most dangerous frequency decreases as the hump is moved downstream.
The results show that compressibility stabilizes the flow and that the most dangerous frequency decreases as the Mach number increases for a fixed location of the hump. The analysis is performed for different heights and locations of the hump and for different Mach numbers. The output of this stability program is the growth rates which are integrated along a prescribed path to yield the amplification factor (i.e., N-factor), which is used to predict transition from laminar to turbulent flow. Then, the two-dimensional mean flow is fed into a stability program which is capable of doing two-and three-dimensional analysis.
Boundary layer airfoil code#
The code is capable of solving compressible as well as incompressible flows. If you were able to visualize how the particles were moving in that region close to the airfoil, in the BL, youd see the particles smoothly following the contour of the airfoil, if the BL was laminar. The mean flow is calculated by using an interacting boundary-layer solver which accounts for strong viscous/inviscid interaction and separation bubbles. The boundary layer, a mathematical construct yet a convenient way to visualize whats going on, can be laminar, or turbulent. The effect of humps on the stability of subsonic boundary layers over an airfoil is investigated.
0 kommentar(er)
