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ISSN: 2348-7887

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STM JOURNALS

1. Numerical Simulation of Flow Field, Fountain Flow and Associated Noise in Supersonic Impinging Twin Jet using Large Eddy Simulation Devi Archana Das, Nishant Madanagopal 1

2. Numerical Investigation of Drag and Lift Forces on Turbulent Flow on an Airfoil Shaped Body at Different Angles of Attack Suvanjan Bhattacharyya, Shramona Chakraborty, Sumanta Laha 9

3. Conceptual Design and Validation of Working of the Wing Morphing Mechanism Using BellowsNandu Jith P. J., Akshay Pal 16

4. Displacements in Thick Beams Using Refined Shear Deformation TheoryAjay G. Dahake, Mahendra R. Chitlange 22

ContentsJournal of Aerospace Engineering & Technology

JoAET (2014) © STM Journals 2014. All Rights Reserved

Journal of Aerospace Engineering & Technology ISSN: 2231-038X (online), ISSN: 2348-7887 (print)

Volume 4, Issue 3

www.stmjournals.com

Numerical Simulation of Flow Field, Fountain Flow and

Associated Noise in Supersonic Impinging Twin Jet using

Large Eddy Simulation

Devi Archana Das*, Nishant Madanagopal Amity Institute of Space Science and Technology, Amity University,

Sector 125, Noida, Uttar Pradesh - 201303, India

Abstract A three-dimensional flow field is produced by a supersonic twin-jet impingement. It is

studied using the turbulence model Large Eddy Simulation (LES). The numerical model

consists of two parallel jets of diameter 3D apart, which are issued from a plane which is at a distance H = 2D, 3D, 4D above the ground. The Nozzle Pressure Ratio (NPR) is kept

at 3.7 for all the flow conditions. The study is based on the extent of rise of the fountain due to the impinging of the jets on the ground plane. The associated noise is calculated

from the pressure distributions at certain important points defined. Instantaneous flow,

mean velocity magnitude, RMS pressure data, mean centre line jet velocities and various fountain flow contours for the twin-jet impingement are produced and discussed. A high

level of unsteadiness and strong interactions between the fountain and the jets are

observed, which varies for the different H/D ratios.

Keywords: LES, supersonic twin-jet impingement, acoustics, vortex formation,

fast fourier transform

*Author for Correspondence E-mail: deviarchanadas@gmail.com

JoAET (2014) © STM Journals 2014. All Rights Reserved

Journal of Aerospace Engineering & Technology ISSN: 2231-038X (online), ISSN: 2348-7887 (print)

Volume 4, Issue 3

www.stmjournals.com

Numerical Investigation of Drag and Lift Forces on

Turbulent Flow on an Airfoil Shaped Body at Different

Angles of Attack

Suvanjan Bhattacharyya1*, Shramona Chakraborty

2, Sumanta Laha

1

1Mechanical Engineering Department, MCKV Institute of Engineering, Liluah,

Howrah, West Bengal, India 2Computer Science Engineering Department, MCKV Institute of Engineering, Liluah,

Howrah, West Bengal, India

Abstract Numerical analysis of drag and lift force on an airfoil shaped body at different angles is

presented. Fundamentals of aircraft design are provided with detailed estimation of the aerodynamic drag and lift of airfoil is presented. This work presents the configuration

optimization of an aerofoil body in air using SST computational fluid dynamics (CFD)

modeling and compared with the experimental result. The governing equations are solved with a finite-volume-based numerical method. A three-dimensional non uniform grid was

generated, in order to critically examine the flow. At different angle the coefficient of drag and lift is determine. Airfoil was placed in a low speed wind tunnel with pressure

taps along its surface. The wind tunnel was operated at nominal velocities during the

coefficient measurement, a Reynolds number of about 100–2000. The airfoil, with a 10 inch chord, was analyzed at 0

o, 5

o, 10

o, 15

o, 20

o, 25

o angles of attack and with fixed load.

Keywords: CFD, drag force, coefficient of drag, coefficient of lift, wind tunnel

JoAET (2014)© STM Journals 2014. All Rights Reserved

Journal of Aerospace Engineering & Technology ISSN: 2231-038X (online), ISSN: 2348-7887 (print)

Volume 4, Issue 3

www.stmjournals.com

Conceptual Design and Validation of Working of the Wing

Morphing Mechanism Using Bellows

Nandu Jith P. J.*, Akshay Pal Amity Institute of Space Science and Technology, Amity University, Noida (U.P.), India

Abstract The research on creating a smooth seamless wing which can literally morph its shape in

mid-flight like birds has been in progress for many years. Such a wing will greatly

enhance the flying capabilities of a normal aircraft. The wing can be morphed at different speeds to increase greater fuel efficiency. Our new design tends to create such a design

without interfering with structural integrity of the wing.

Keywords: Morphing wing, bellows, pneumatic system

JoAET (2014)© STM Journals 2014. All Rights Reserved

Journal of Aerospace Engineering & Technology ISSN: 2231-038X (online), ISSN: 2348-7887 (print)

Volume 4, Issue 3

www.stmjournals.com

Displacements in Thick Beams Using Refined Shear

Deformation Theory

Ajay G. Dahake1*, Mahendra R. Chitlange

2

1Department of Civil Engineering, Marathwada Institute of Engineering, Maharashtra State, India

2Government Polytechnic, Jalna, Maharashtra State, India

Abstract A trigonometric shear deformation theory for displacement of thick beams, by considering the transverse shear deformation effects, is presented. Variables in the

present theory are same as that of in the first order shear deformation theory. The

sinusoidal function is used in displacement field in terms of thickness coordinate to represent the shear deformation effects. Governing differential equations and various

boundary conditions are obtained by using the principle of virtual work. The thick

isotropic beams are considered for the numerical studies to demonstrate the efficacy of the theory. It has been shown that the theory is capable of predicting the local effect of

stress concentration due to fixity of support. The cantilever and fixed isotropic beams subjected to various loads are examined using the present theory. Results obtained are

discussed with those of other theories.

Keywords: Thick beam, trigonometric shear deformation, principle of virtual work,

equilibrium equations, displacement, stress