Performance characteristics in transonic axial compressor rotor blade using circular jets

The reduction of the flow separation region or even eliminating it from the transonic axial flow compressor has been a motivating research area as it reduces turbulence and modifies the flow field into more desired state. Even a small performance improvement could be a big help in saving fuel cost....

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Main Author:	Epsipha, Pauline
Format:	Thesis
Language:	English
Published:	2016
Subjects:	Aerodynamics Transonic Compressors - Blades
Online Access:	http://psasir.upm.edu.my/id/eprint/70648/1/FK%202016%20151%20-%20IR.pdf
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id	my-upm-ir.70648
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spelling	my-upm-ir.706482019-08-22T00:58:34Z Performance characteristics in transonic axial compressor rotor blade using circular jets 2016-10 Epsipha, Pauline The reduction of the flow separation region or even eliminating it from the transonic axial flow compressor has been a motivating research area as it reduces turbulence and modifies the flow field into more desired state. Even a small performance improvement could be a big help in saving fuel cost. Several active and passive flow control options were established and one among them is synthetic jet. Synthetic jet provides unsteady momentum to the flow field without net mass injection. Synthetic jets with slot orifice are previously investigated in transonic level study for its efficiency enhancement. Hence, a systematic numerical investigation was carried out to understand the impact of circular jets as continuous steady jet in transonic level study which is followed by time constrained synthetic jet (transient) for the analysis of flow control effectiveness. The seven and fourteen array of jet formation were placed at three positions specifically upstream, downstream and close to the flow separation point (25%, 50% and 75% of the blade span) at suction side of transonic compressor rotor blade. Two velocities such as 300m/s and 500 m/s were tested in all three jet position models to discover the superior separation control model and finally one reasonable model with better flow control effectiveness was used to run the time constrained synthetic jet approach for analyzing the flow field. High actuation velocity provided (500m/s) shows healthier variation in flow control compared to lower velocity (300m/s) due to its low momentum coefficient. In seven array jet formations, the jet flow fixed upstream the separation point (25% of blade span) controls the separation region more effectively while in fourteen array configuration, the jet placed at the midpoint of the blade span (close to separation point) enhances the separation control showing desirable flow control. However the vital part is that velocity distribution over the blade which reduces the flow separation in contradictory abundantly affects the total pressure ratio which also impacts adiabatic efficiency. Thus 4% of efficiency loss were calculated in seven array configuration and 13% of efficiency loss in fourteen array configuration. Comparative study over these models gives us the detailed analysis of flow field performance characteristics such as velocityvariation, 3D velocity streamline, pressure distribution, Mach number distribution, efficiency and total pressure ratio. Aerodynamics, Transonic Compressors - Blades 2016-10 Thesis http://psasir.upm.edu.my/id/eprint/70648/ http://psasir.upm.edu.my/id/eprint/70648/1/FK%202016%20151%20-%20IR.pdf text en public masters Universiti Putra Malaysia Aerodynamics, Transonic Compressors - Blades
institution	Universiti Putra Malaysia
collection	PSAS Institutional Repository
language	English
topic	Aerodynamics Transonic Compressors - Blades
spellingShingle	Aerodynamics Transonic Compressors - Blades Epsipha, Pauline Performance characteristics in transonic axial compressor rotor blade using circular jets
description	The reduction of the flow separation region or even eliminating it from the transonic axial flow compressor has been a motivating research area as it reduces turbulence and modifies the flow field into more desired state. Even a small performance improvement could be a big help in saving fuel cost. Several active and passive flow control options were established and one among them is synthetic jet. Synthetic jet provides unsteady momentum to the flow field without net mass injection. Synthetic jets with slot orifice are previously investigated in transonic level study for its efficiency enhancement. Hence, a systematic numerical investigation was carried out to understand the impact of circular jets as continuous steady jet in transonic level study which is followed by time constrained synthetic jet (transient) for the analysis of flow control effectiveness. The seven and fourteen array of jet formation were placed at three positions specifically upstream, downstream and close to the flow separation point (25%, 50% and 75% of the blade span) at suction side of transonic compressor rotor blade. Two velocities such as 300m/s and 500 m/s were tested in all three jet position models to discover the superior separation control model and finally one reasonable model with better flow control effectiveness was used to run the time constrained synthetic jet approach for analyzing the flow field. High actuation velocity provided (500m/s) shows healthier variation in flow control compared to lower velocity (300m/s) due to its low momentum coefficient. In seven array jet formations, the jet flow fixed upstream the separation point (25% of blade span) controls the separation region more effectively while in fourteen array configuration, the jet placed at the midpoint of the blade span (close to separation point) enhances the separation control showing desirable flow control. However the vital part is that velocity distribution over the blade which reduces the flow separation in contradictory abundantly affects the total pressure ratio which also impacts adiabatic efficiency. Thus 4% of efficiency loss were calculated in seven array configuration and 13% of efficiency loss in fourteen array configuration. Comparative study over these models gives us the detailed analysis of flow field performance characteristics such as velocityvariation, 3D velocity streamline, pressure distribution, Mach number distribution, efficiency and total pressure ratio.
format	Thesis
qualification_level	Master's degree
author	Epsipha, Pauline
author_facet	Epsipha, Pauline
author_sort	Epsipha, Pauline
title	Performance characteristics in transonic axial compressor rotor blade using circular jets
title_short	Performance characteristics in transonic axial compressor rotor blade using circular jets
title_full	Performance characteristics in transonic axial compressor rotor blade using circular jets
title_fullStr	Performance characteristics in transonic axial compressor rotor blade using circular jets
title_full_unstemmed	Performance characteristics in transonic axial compressor rotor blade using circular jets
title_sort	performance characteristics in transonic axial compressor rotor blade using circular jets
granting_institution	Universiti Putra Malaysia
publishDate	2016
url	http://psasir.upm.edu.my/id/eprint/70648/1/FK%202016%20151%20-%20IR.pdf
_version_	1747812882390712320

Performance characteristics in transonic axial compressor rotor blade using circular jets

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