Browsing Mechanical & Industrial Engineering by Author "Badr, Osama"
Now showing items 1-16 of 16
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Aeroacoustic Simulation for NASA CC3 Centrifugal Compressor Operating at off Design Condition
Alqaradawi, Mohamed; Shahin, Ibrahim; Gadala, Mohamed; Badr, Osama (2016 , Conference Paper)This paper covers the characterization of the acoustic noise and the unsteady flow field of a high speed centrifugal compressor NASA CC3. In order to accurately predict the noise, all analyses are carried out through the ... -
Centrifugal Compressor Spiral Dry Gas Seal Simulation Working at Reverse Rotation
Ibrahim, Shahin; Gadala, Mohamed; Alqaradawi, Mohamed; Badr, Osama ( Elsevier Ltd , 2013 , Conference Paper)Unidirectional dry gas seal may experiences reverse rotation when equipped in a centrifugal compressor. This paper describes how the reverse rotation effects on the spiral unidirectional dry gas seal performance and pressure ... -
Dry gas seal simulation with different spiral tapered grooves
Shahin, Ibrahim; Gadala, Mohamed; Alqaradawi, Mohamed; Badr, Osama ( UiTM Press , 2014 , Article)The flow and performance analysis for a dry gas seal (DGS) with a standard and tapered spiral grooves is developed using a verified FLUENT CFD model. A comprehensive analysis is proposed to resolve the effect of modifying ... -
Effect of blade tip geometry on centrifugal compressor performance and stability
Shahina, Ibrahim; Alqaradawi, Mohamed; Gadala, Mohamed; Badr, Osama ( Medwell Journals , 2016 , Article)The reliability operation for small fuel cells and hybrid fuel cell with gas turbine requires centrifugal compressor surge prevention. This study concerns a high speed centrifugal compressor stage with different blade tip ... -
Influence of changing casing groove parameters on the performance of centrifugal compressors near stall condition
Halawa, Taher; Gadala, Mohamed S.; Alqaradawi, Mohamed; Badr, Osama ( American Society of Mechanical Engineers (ASME) , 2016 , Article)The casing treatment is an effective method for increasing the stall margin of compressors and enhancing the flow distribution at the blades tip. The present numerical study focuses on making an optimization of the casing ... -
Large eddy simulation of surge inception and active surge control in a high speed centrifugal compressor with a vaned diffuser
Shahin, Ibrahim; Alqaradawi, Mohamed; Gadala, Mohamed; Badr, Osama ( Elsevier Inc. , 2016 , Article)In this study, we present a numerical investigation of active surge control and performance improvement for an aero engine centrifugal compressor (NASA CC3) using self-recirculating bleed slots with different bleeding ... -
Large eddy simulation of surge inception and active surge control in a high speed centrifugal compressor with a vaned diffuser
Shahin, Ibrahim; Alqaradawi, Mohamed; Gadala, Mohamed; Badr, Osama ( Elsevier , 2016 , Article)In this study, we present a numerical investigation of active surge control and performance improvement for an aero engine centrifugal compressor (NASA CC3) using self-recirculating bleed slots with different bleeding ... -
Numerical investigation of rotating stall characteristics and active stall control in centrifugal compressors
Halawa, Taher; Alqaradawi, Mohamed; Badr, Osama; Gadala, Mohamed S. ( American Society of Mechanical Engineers (ASME) , 2014 , Conference Paper)This paper focuses on providing better view for the understanding of rotating stall phenomenon in centrifugal compressors by using numerical simulations and presents a study of the role of air injection method in delaying ... -
Numerical investigation of rotating stall in centrifugal compressor with vaned and vaneless diffuser
Halawa, Taher; Alqaradawi, Mohamed; Gadala, Mohamed S.; Shahin, Ibrahim; Badr, Osama ( Science Press , 2015 , Article)This study presents a numerical simulation of the stall and surge in a centrifugal compressor and presents a descriptionof the stall development in two different cases. The first case is for a compressor with vaneless ... -
Numerical investigation of steady air injection flow to control rotating stall in centrifugal compressors
Halawa, Taher; Alqaradawi, Mohamed; Badr, Osama; Gadala, Mohamed S. ( Web Portal ASME (American Society of Mechanical Engineers) , 2014 , Conference Paper)This paper concerns the role of air injection method in stabilization and stall control in centrifugal compressors. The main aim is to find the best arrangement of air injection parameters such as injection angle and ... -
Numerical simulation and control of rotating stall in a transonic centrifugal compressor
Halawa, Taher; Alqaradawi, Mohamed; Badr, Osama; Gadala, Mohamed S. ( Web Portal ASME (American Society of Mechanical Engineers) , 2014 , Conference Paper)This study presents a numerical simulation of precursors and characteristics of rotating stall in a centrifugal compressor with vaned diffuser. The aim is to further understand the causes of stall inception, characteristics ... -
Numerical simulation of stall development into surge and stall control using air injection in centrifugal compressors
Halawa, Taher; Alqaradawi, Mohamed; Badr, Osama; Gadala, Mohamed S. ( American Society of Mechanical Engineers (ASME) , 2014 , Conference Paper)This study presents a numerical simulation of the formation of rotating stall and the initiation of surge in order to study the connection between stall and surge in centrifugal compressors. Also, the current paper introduces ... -
Numerical simulation of using combined active and passive stall control techniques in centrifugal compressors
Halawa, Taher; Alqaradawi, Mohamed; Badr, Osama; Gadala, Mohamed S. ( American Society of Mechanical Engineers (ASME) , 2014 , Conference Paper)This study presents a numerical simulation of stall control by using the casing treatment method which represents the passive control technique and also by using the air injection method which represents the active control ... -
On the aero acoustic and internal flows structure in a centrifugal compressor with hub side cavity operating at off design condition
Ibrahim, Shahin; Alqaradawi, Mohamed; Gadala, Mohamed; Badr, Osama ( Elsevier , 2016 , Article)This paper covers the characterization of the acoustic noise and the unsteady flow field of a high speed centrifugal compressor NASA CC3. In order to accurately predict the noise, all analyses are carried out through the ... -
Three Dimensional Computational Study for Spiral Dry Gas Seal with Constant Groove Depth and Different Tapered Grooves
Ibrahim, Shahin; Gadala, Mohamed; Alqaradawi, Mohamed; Badr, Osama ( Elsevier Ltd , 2013 , Conference Paper)The three dimensional simulation for dry gas seal with constant depth spiral grooves and with different taper grooves is done using ANSYS FLUENT CFD code. Grid independence study and code validation are done with experimental ... -
Unsteady CFD simulation for high speed centrifugal compressor operating near surge
Shahin, Ibrahim; Gadala, Mohamed; Alqaradawi, Mohamed; Badr, Osama ( American Society of Mechanical Engineers (ASME) , 2014 , Conference Paper)Centrifugal compressor surge and stall are an instabilities flow and system phenomenon, which can lead to a loss of engine power, large pressure transients and, in some cases, failure of the compressor and bearing system. ...