CFD analysis on the effect of Pintle geometry in the performance of expansion Deflection Dual-Bell Nozzle

The purpose of the rocket nozzle is to expand and accelerate the combustion products to very high supersonic velocities. Since rocket nozzles need to operate at different ranges from sea level to high altitudes, there are different types of altitude compensating nozzles (ACN), with many studies usin...

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Bibliographic Details
Main Authors: Naik, Atharva, Charapalle, Samruddhi, Kalekar, Yashdeep, Walave, Gurudas, Balaji, K., Bajaj, Dinesh Kumar
Format: Conference Proceeding
Language:English
Subjects:
Altitude
CAD
Combustion products
Computational fluid dynamics
Computer aided design
Configurations
Deflection
Diameters
Flow characteristics
High altitude
Mach number
Nozzle design
Nozzles
Pressure ratio
Qualitative analysis
Rocket nozzles
Shape
Thrust
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Summary:The purpose of the rocket nozzle is to expand and accelerate the combustion products to very high supersonic velocities. Since rocket nozzles need to operate at different ranges from sea level to high altitudes, there are different types of altitude compensating nozzles (ACN), with many studies using expansion deflection nozzles (EDN) and double bell nozzles (DBN). Together they form an expansion-Deflection Dual Bell Nozzle (EDDBN), and According to reports, pressure ratios( mode transition) of EDDBN are elevated as compared to DBN. The purpose of this study is to determine the changes in features of the flow and effectiveness of altitude compensation by varying the Pintel geometry of the EDDBN. We analyze how pintel shape changes affect pressure and Mach number contour changes, and identify the most efficient configuration in altitude mode while maintaining a 100-nozzle pressure ratio. The study was conducted with the aid of appropriate two-dimensional axisymmetric Reynolds-averaged numerical simulations with the aid of the commercial CFD program ANSYS, qualitative and quantitative analyses have been carried out in the current work. At fixed nozzle pressure ratio, it is found that the more extended pintle diameter configuration gives better flow characteristics which means the flow characteristics get better with increase in diameter of pintle which leads to reduced thrust and flow losses and improved thrust performance, hence better performance for EDDB Nozzle design, confirming the application of design.
ISSN:0094-243X
1551-7616
DOI:10.1063/5.0157079