An Investigation to Control Base Pressure in Suddenly Expanded Flows
In suddenly expanded flows, due to the abrupt expansion of the flow from a nozzle into an enlarged duct, the pressure reduces in the base region of the enlarged duct which increases the base drag. The techniques used to increase the base pressure are namely passive control technique and active control technique. In passive control technique the geometrical modifications are employed by providing splitter plates, ribs, cavities etc. while in active control technique the secondary control jets are provided in the base region of an enlarged duct to increase base pressure up to atmospheric pressure. The air blowing pressure from secondary control jets should be optimum. This paper presents the computational fluid dynamic (CFD) analysis to optimize blowing pressure ratio i.e. the ratio of inlet pressure of control jets to the atmospheric pressure, to increase base pressure up to atmospheric pressure in the base region of an enlarged duct. In the present study, CFD analysis was carried out for different air blowing pressure ratios to optimize it. Flow and geometry parameters considered for the analysis are Mach number, area ratio, nozzle pressure ratio and blowing pressure ratio. Mach numbers considered for analysis are 1.5, 2.0 and 2.5. Area ratios and nozzle pressure ratios considered for analysis are 2, 5 and 8. The CFD analysis is done for different combinations of Mach numbers, area ratios, and the nozzle pressure ratios by varying blowing pressure ratio from 2 to 8 in step of 1. Based on analysis results anyone can select optimum value of blowing pressure ratio at a given Mach number, area ratio and nozzle pressure ratio to increase base pressure nearly up to atmospheric pressure.
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E. Rathakrishnan and R. Srikanth, Flow Through Pipes with Sudden Enlargement, Mechanics Research Communications Vol. 18 (4), 1991. Printed in the USA (1991), 199-206.
Viswanath, Flow management techniques for base and after body drag reduction, Progress in Aerospace Sciences 32, (1996), 79-129.
E. Rathakrishnan, S. A. Khan, Active control of suddenly expanded flows from over expanded nozzles, International Journal of Turbo and Jet Engines, 19, (2002), 119-126.
S. A. Khan and E. Rathakrishnan, Control of suddenly expanded flows with micro jets, International Journal of Turbo and Jet Engines, 20, (2003), 63-81.
S. A. Khan and E. Rathakrishnan, Active control of suddenly expanded flows from under expanded nozzles, International Journal of Turbo and Jet Engines, 21, (2004), 233-253.
S. A. Khan and E. Rathakrishnan, Control of suddenly expanded flows from Correctly expanded nozzles, International Journal of Turbo and Jet Engines, 21, (2004), 255-278.
S. A. Khan and E. Rathakrishnan, Nozzle expansion level effect on suddenly expanded flow, International Journal of Turbo and Jet Engines, 23, (2006), 233-257.
Shafiqur Rehman and S. A. Khan, Control of Base Pressure with Micro Jets Part-I. Aircraft Engineering and Aerospace Technology: An International Journal (AEAT), Volume 80, Issue 2, (2008), 158-164.
Maughal Ahmed Ali Baig, E Rathakrishnan et. al., Control of Base Flows with Micro Jets, Int. J. Turbo Jet-Engines, Vol. 28 (2011), 59–69.
Biswas, A., Sinha, P., Mullick, A., Majumdar, B., A Computational Analysis of Flow Development Through a Constant Area S-Duct, (2013) International Review of Aerospace Engineering (IREASE), 6 (3), pp. 145-152.
Ashfaq, S., Khan, S., Rathakrishnan, E., Control of Base Pressure with Micro Jets for Area Ratio 2.4, (2014) International Review of Mechanical Engineering (IREME), 8 (1), pp. 1-10.
Fharukh Ahmed G M, Experimental Study of Suddenly Expanded Flow from Correctly Expanded Nozzles, ARPN Journal of Engineering and Applied Sciences, Volume 11, No. 16, (2016), 10041-10047.
S. A. Khan et.al., Experimental Studies of the Base Flow from the Nozzles with Sudden Expansion with Micro Jets, International Journal of Energy, Environment and Economics, (2016), Volume 24, Number 1, 59-66.
S. A. Khan et.al. Experimental and numerical studies on flow from axisymmetric nozzle flow with sudden, International Journal of Energy, Environment and Economics, (2016), Volume 24, Number 1, 184-191.
Vigneshvaran Sethuraman et.al, Effect of sudden expansion for varied area ratios at subsonic and sonic flow regimes, International Journal of Energy, Environment and Economics, (2016), Volume 24, Number 1, 261-268.
Chaudhary et al., Experimental investigation on the effectiveness of active control mechanism on base pressure at low supersonic Mach numbers, Innovative design and development practices in aerospace and automotive engineering, published by Springer Link, (2016), 978-981.
Pathan K. A., P. S. Dabeer and S. A. Khan, CFD Analysis of the Supersonic Nozzle Flow with Sudden Expansion, International Organization of Scientific Research-Journal of Mechanical and Civil Engineering (IOSR-JMCE), Special Issue Volume 4, (2016), 05-07.
Jaimon D. Quadros et al., Investigation of effect of process parameters on suddenly Expanded flows through an axi-symmetric nozzle for different Mach Numbers using Design of Experiments, International Conference on Mechanical, Automotive and Aerospace Engineering 2016, IOP Conf. Series: Materials Science and Engineering 184 (2017), 1-8.
M. Asadullah, et al., Active control of base pressure with counter clockwise rotating cylinder at Mach 2, 4th IEEE International Conference on Engineering Technologies and Applied Sciences (ICETAS), (2017), 1-6.
Sunil, A., Tide, P., An Investigation on Suppression of Vortex Instabilities for Flow Past a Bluff Body Using a Passive Device, (2017) International Review of Mechanical Engineering (IREME), 11 (2), pp. 132-137.
K. A. Pathan, S. A. Khan and P. S. Dabeer, CFD analysis of effect of area ratio on suddenly expanded flows, 2nd International Conference for Convergence in Technology (I2CT) published by IEEE USA, (2017), 1192-1198.
K. A. Pathan, S. A. Khan and P. S. Dabeer, CFD analysis of effect of Mach number, area ratio and nozzle pressure ratio on velocity for suddenly expanded flows, 2nd International Conference for Convergence in Technology (I2CT) published by IEEE USA, (2017) 1104-1110.
K. A. Pathan, S. A. Khan and P. S. Dabeer, CFD analysis of effect of flow and geometry parameters on thrust force created by flow from nozzle, 2nd International Conference for Convergence in Technology (I2CT) published by IEEE USA, (2017), 1121-1125.
Vigneshvaran Sethuraman and S. A. Khan, Base Pressure Control using Micro-jets in Supersonic Flow Regimes, International Journal of Aviation, Aeronautics and Aerospace, Volume 5, Issue 1, (2018).
Tarakka, R., Salam, N., Jalaluddin, J., Ihsan, M., Active Flow Control by Suction on Vehicle Models with Variations on Front Geometry, (2018) International Review of Mechanical Engineering (IREME), 12 (2), pp. 128-134.
Alias, M., Mohd Rafie, A., Wiriadidjaja, S., Two Dimensional Numerical Study of Aerodynamic Characteristic for Rotating Cylinder at High Reynolds Number, (2016) International Review of Aerospace Engineering (IREASE), 9 (6), pp. 208-215.
Aziz, M., Elsayed, A., CFD Investigations for UAV and MAV Low Speed Airfoils Characteristics, (2015) International Review of Aerospace Engineering (IREASE), 8 (3), pp. 95-100.
Ahmed, S., Nazari, A., Numerical Study of Rotating Cylinder Effects on the Performance of a Symmetrical Airfoil Section, (2015) International Review on Modelling and Simulations (IREMOS), 8 (2), pp. 239-244.
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