Review of research into the concept of the microblowing technique for turbulent skin friction reduction

Abstract

A new technology for reducing turbulent skin friction, called the Microblowing Technique (MBT), is presented. Results from proof-of-concept experiments show that this technology could potentially reduce turbulent skin friction by more than 50% of the skin friction of a solid flat plate for subsonic and supersonic flow conditions. The primary purpose of this review paper is to provide readers with information on the turbulent skin friction reduction obtained from many experiments using the MBT. Although the MBT has a penalty for obtaining the microblowing air associated with it, some combinations of the MBT with suction boundary layer control methods are an attractive alternative for a real application. Several computational simulations to understand the flow physics of the MBT are also included. More experiments and computational fluid dynamics (0) computations are needed for the understanding of the unsteady flow nature of the MBT and the optimization of this new technology.

Current state and prospects of researches on the control of turbulent boundary layer by air blowing

“…As is seen, the periodical velocity variation along the plate length plainly correlates with the orifice intervals, which is represented with 250-fold image blowup. Note by the way that, in accordance with the results of direct friction measurement [66], a smaller orifice diameter does not improve the situation. Probably the nonuniform character of the flow at the orifice exit might be partially weakened by a carefully chosen permeable substrate (filter) located immediately below the perforated plate.…”

“…Ref. [66] presents the aggregation of preliminary Hwang and co-authors' experience; herein, they give the results of the investigations of five perforated plates with thickness from 0.152 to 1.020 mm, porosity varying from 21% to 50% and orifice diameters varying from in 0.06 to 0.381 mm the wind tunnel at Mach numbers from 0.3 to 0.7. The relative mass flow rate of the blown air varied within the range of 0-0.205 kg/m 2 /s.…”

“…[72]. In the works of Hwang [64,66] the parameters of perforated surface were varied quite widely. Parkhe [74] used three perforated plates with a porosity of 23%, 4%, and 40%; hole diameter of 0.165 mm, 0.130 mm, and 1.676 mm; aspect ratio of 6.16, 1.77, and 0.68, respectively.…”

Aerodynamic Effects of Uniform Blowing and Suction on a NACA4412 Airfoil

“…More recent studies confirmed this possibility, investigating the effects of MBT on more complex geometries as well as on turbulent boundary layers subject to adverse-pressure gradients. For a detailed description of the development of the MBT technique, we refer to the review by Hwang (2004), whereas Kornilov (2015) discusses more recent advancements, focusing on experimental results.…”

Steady Blowing / Suction into Turbulent Boundary Layer of a Symmetrical Aerofoil Section

“…Существует множество способов улучшения аэродинамических характеристик летательного аппарата (ЛА), а также отдельных его элементов, в том числе крыла самолета. Некоторые из них основаны на совершенствовании облика ЛА, другие [1][2][3][4] на применении пассивных и активных методов управления пограничным слоем. Проблема состоит в том, что при обтекании многих элементов ЛА, таких как фюзеляж самолета, корпус ракеты, а в некоторых случаях и крыло, пограничный слой в широком диапазоне чисел Рейнольдса находится в турбулентном состоянии.…”