Interactions of a Low-Aspect-Ratio Cantilevered Dynamic Pin with a Boundary Layer

AIAA Journal ◽  
2017 ◽  
Vol 55 (7) ◽  
pp. 2142-2157 ◽  
Author(s):  
S. Gildersleeve ◽  
B. A. Tuna ◽  
M. Amitay
Keyword(s):  
Boundary Layer ◽  
Aspect Ratio ◽  
Low Aspect Ratio

Heat Transfer Around a Cylindrical Protuberance Mounted in a Plane Turbulent Boundary Layer

2005 ◽  
Vol 128 (2) ◽  
pp. 153-161 ◽  
Author(s):  
Takayuki Tsutsui ◽  
Masafumi Kawahara
Keyword(s):  
Heat Transfer ◽  
Boundary Layer ◽  
Aspect Ratio ◽  
Turbulent Boundary Layer ◽  
Layer Thickness ◽  
Boundary Layer Thickness ◽  
Reynolds Numbers ◽  
Heat Transfer Characteristics ◽  
Low Aspect Ratio ◽  
Maximum Value

Heat transfer characteristics around a low aspect ratio cylindrical protuberance placed in a turbulent boundary layer were investigated. The diameters of the protuberance, D, were 40 and 80mm, and the height to diameter aspect ratio H∕D ranged from 0.125 to 1.0. The Reynolds numbers based on D ranged from 1.1×104 to 1.1×105 and the thickness of the turbulent boundary layer at the protuberance location, δ, ranged from 26 to 120mm for these experiments. In this paper we detail the effects of the boundary layer thickness and the protuberance aspect ratio on heat transfer. The results revealed that the overall heat transfer for the cylindrical protuberance reaches a maximum value when H∕δ=0.24.

Performance Prediction for High Turning Low Aspect Ratio Stator Cascades in the Transonic Regime

1970 ◽  
Vol 92 (4) ◽  
pp. 390-398
Author(s):  
H. F. L. Griepentrog
Keyword(s):  
Boundary Layer ◽  
Aspect Ratio ◽  
Flow Field ◽  
Performance Prediction ◽  
Transonic Flow ◽  
Secondary Flows ◽  
Compressor Stage ◽  
Low Aspect Ratio ◽  
Aspect Ratios ◽  
Boundary Layer Interaction

This paper describes a method for the prediction of the transonic flow field in a high solidity, high turning cascade, suitable for use as stator of a shock-in-rotor supersonic compressor stage. Effects of shock boundary layer interaction is taken into account by empirical correlation, valid for blade aspect ratios below unity. Use of partial slots for reduction of the secondary flows is briefly discussed and a correlation on slot efficiency is presented.

Convective Heat Exchange and Friction in a Thin Laminar-to-Turbulent Boundary Layer on the Impermeable Lateral Surfaces of Blunted Cones Featuring a Low Aspect Ratio

2021 ◽  
pp. 25-37
Author(s):  
V.V. Gorskiy ◽  
A.G. Savvina
Keyword(s):  
Boundary Layer ◽  
Aspect Ratio ◽  
Turbulent Boundary Layer ◽  
Convective Heat ◽  
Turbulent Viscosity ◽  
Aircraft Design ◽  
Effective Length ◽  
Low Aspect Ratio ◽  
Viscosity Models ◽  
Semi Empirical

In order to provide a high-quality solution to the problem of computing convective heat transfer parameters in a laminar-to-turbulent boundary layer, it is necessary to numerically integrate differential equations describing that layer, completed by semi-empirical turbulent viscosity models, said models having been tested by comparing their output to the results of experimental investigations where the gas dynamics of a gas flow around a body is correctly simulated. Developing relatively simple yet adequately accurate computation methods becomes crucial for practical applications. To date, the effective length method, being simple yet apparently boasting an acceptable accuracy, has become the most widespread technique for solving this problem in aircraft design and aerospace technology. However, this statement is not correct for large Reynolds numbers on a hemisphere. Under these conditions, semi-empirical apparent turbulent viscosity models provide significantly better matches to experimental data. The paper analyses the feasibility of using a similar approach for the lateral surface of a blunted cone featuring a low aspect ratio. We describe a new efficient approach to solving this problem, demonstrating a high accuracy and maximum simplicity when used in practice. We check the results of systematic computations using our method against comparable data obtained via the most frequently cited approaches to solving this problem

Experimental and theoretical investigation of boundary layer perturbations on a low-aspect-ratio wing

2006 ◽  
Vol 13 (4) ◽  
pp. 507-514 ◽  
Author(s):  
V. V. Kozlov ◽  
I. D. Zverkov ◽  
B. Yu. Zanin ◽  
A. V. Dovgal ◽  
V. Ya. Rudyak ◽  
...  
Keyword(s):  
Boundary Layer ◽  
Aspect Ratio ◽  
Theoretical Investigation ◽  
Low Aspect Ratio
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