Computational Analysis of Chevron-Enhanced Bypass Dual Throat Nozzle for Thrust Vectoring Efficiency

Karthikeyan Periasamy ； Shanmugarajan Ravichandran Ramasamy ； Surendra Bogadi ； Yogesh Kumar Sinha

《Journal of Aeronautics, Astronautics and Aviation》 56卷5期 Vol.56 No.5 (2024/10) Pp. 967-976

https://doi.org/10.6125/JoAAA.202410_56(5).05

摘要

This study explores the efficacy of Fluidic Thrust Vectoring (FTV) techniques for directing aircraft thrust to manage the attitude or angular velocity of an aerospace vehicle, focusing specifically on the application of Fluidic Throat Skewing. A novel approach is employed utilizing a Bypass Dual Throat Nozzle (BDTN) augmented with chevrons to achieve FTV under varying expansion scenarios, assessed through computational analysis. The study limits bypass mass injection to 3% of the total mass injection. Computational Fluid Dynamics (CFD) simulations were executed using commercial CFD solver ANSYS CFX, employing Navier-Stokes equations to evaluate thrust vectoring performance. The findings reveal that the BDTN configuration achieves a maximum vectoring angle of 16.66 degrees and a thrust coefficient of 0.839 at a Nozzle Pressure Ratio (NPR) of 8, marking a 7% reduction in thrust coefficient compared to a conventional Dual Throat Nozzle (DTN). Notably, the Chevron-integrated BDTN model (BDTN-C) demonstrated a superior vectoring angle of 21.47 degrees-a 28.99% improvement-with a thrust coefficient of 0.631 (a reduction) at a lower NPR of. The study concludes that Chevron-augmented BDTN significantly improves vectoring at lower NPR, offering insights into optimizing thrust vectoring performance in aerospace applications.

關鍵字

Fluidic Thrust Vectoring ； Computational Fluid Dynamics ； Chevrons ； Dual Throat Nozzle ； Nozzle Pressure Ratio

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