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Numerical modeling of vortex non-steady flow field of viscous gas and acoustic characteristics based on the open source project for calculating the flow around aircraft
Engineering Education # 08, August 2013
DOI: 10.7463/0813.0605410
This paper shows the possibility of using the open source CFD software package OpenFOAM and developed methods for calculating unsteady vortex flow fields and acoustic fields in studying the flow around aircraft. Numerical calculations of aerodynamic characteristics of an airbrake mounted on the fuselage of an aircraft were conducted. A hybrid model of turbulence using RANS and LES approaches was defined. Curle’s acoustic analogy was used for calculation. Flow fields of the aircraft and acoustic performance were obtained. Pulsations acting on the tail fin induced by an airbrake were also analyzed. It was determined that pulsations of a lateral force on the fin of an aircraft caused by airbrake was 6 times more than pulsations in absence of the airbrake; and the sound pressure level was more than 50 dB.
Experimental and mathematical simulation of fairing aircraft with braking devices
Engineering Education # 11, November 2012
DOI: 10.7463/1112.0489665
The purpose of this work is to determine the influence of design parameters, such as a form of the fairing, lengthening of the body, type of brakes, on aerodynamic characteristics and flow structure of an aircraft. This paper presents the results of physical experiments on the flow around aircraft with different configurations of the bow and braking. Numerical calculations of the studied bodies and comparative analysis of the results were conducted. Problem formulation and method of calculation were described. The Reynolds equations were closed using the k-omega SST turbulence model. The solution method is based on the finite method algorithm. The influence of gas flow between the plates on the value of the base drag was revealed.
Selection of aerodynamic configuration of a probe streamlined by a turbulent swirling gas flow
Engineering Education # 10, October 2012
DOI: 10.7463/1012.0461853
The purpose of the study is to select an optimum componentry for the device "Scanliner". The authors present results of numerical calculations of streamlining of the probe with different componentry in a swirling gas flow. The problem and solution method are described. Reynolds equations are closed by Menter turbulence model. The basis of the calculation method is a method of control volume. The authors provide a calculation of ADF of different componentry of the bodies at changing the angle of the attack and angular velocity of the spin flow. The authors compare experimental results obtained in the installation 'screw-ring'. Basing on these results, a recommendation can be given re optimal componentry for the device which has a form of a blunt cylinder with two disks.
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