Document Details

Document Type : Thesis 
Document Title :
NUMERICAL INVESTIGATION OF SUPERSONIC RECTANGULAR JET WITH AFT DECK
دراسة عددية لنفاث مستطيل ذو سطح خلفي عند سرعات فوق صوتية
 
Subject : Faculty of Engineering 
Document Language : Arabic 
Abstract : This study investigates flow physics of under-expanded turbulent jets issuing from rectangular exit nozzles with an aft deck, a representative of an airframe integrated propulsion system significant in reducing infrared signature for stealth aircrafts as well as reducing noise and drag for civil aircrafts. Three nozzles with different aft deck lengths (1.36Dh, 2.37Dh and 3.36Dh) for Nozzle Pressure ratio values of 1.9, 2.45, 3, 3.5 and 4 were considered alongside a baseline nozzle without an aft deck. Ansys Fluent was used to carry out the computations. Computed pitot pressure along the jet centerline and at different streamwise locations together with pressure on the aft deck were validated against available experimental data and further used to analyze the effect of aft deck length on entrainment rate and the interaction of shocks train with shear and boundary layer for various NPRs. Temperature distribution was also reported to assess the effect of the aft deck on the infrared signature. The simulation captures the flow phenomenon well and agrees with the experimental data with a slight shift in the shock locations. The introduction of aft deck decreases the entrainment rate, alters the shear layer growth as well as the shock expansion pattern which increases the potential core, thickens the boundary layer at low NPRs and induces flow separation and reattachment at high NPRs. Additionally, jet deflections were observed depending on the deck length and the nozzle pressure ratio (NPR). The infrared signature was found out to be reduced in all aft cases. Lastly, a 2D and 3D flow cases were compared. Key words: supersonic jet, rectangular nozzle, aft deck, jet deflection, flow separation 
Supervisor : Dr. Ibraheem ALQadi 
Thesis Type : Master Thesis 
Publishing Year : 1445 AH
2023 AD 
Added Date : Tuesday, November 28, 2023 

Researchers

Researcher Name (Arabic)Researcher Name (English)Researcher TypeDr GradeEmail
شرف الدين أوولابي عبد الرؤوفAbdulrauf, Sarafadeen OwolabiResearcherMaster 

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 49563.pdf pdf 

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