ADVANCED FLUIDIC THRUST VECTORING WITH DUAL THROAT NOZZLE: ACHIEVING SUPERIOR THRUST VECTORING ANGLE AND EFFICIENCY WITH DUAL PORT INJECTION

This study investigates the performance enhancement of a novel fluidic thrust vectoring (FTV) technique utilizing a dual throat nozzle (DTN). The DTN incorporates dual secondary injection ports strategically positioned within the cavity to amplify pressure differentials and improve sonic-plane skewing. By manipulating port locations, the study aims to optimize the thrust vectoring angle (δ<i><sub>p</sub></i>) and thrust efficiency (η). Performance parameters, including the thrust coefficient (<i>C<sub>f</sub></i>), coefficient of discharge (<i>C<sub>d</sub></i>), δ<i><sub>p</sub></i>, and η, are evaluated for various port configurations. Results demonstrate that positioning the second port closer to the upstream throat enhances δ<i><sub>p</sub></i> and η due to increased interaction between primary and secondary flows. The optimal configuration, MSD10, achieves a maximum δ<i><sub>p</sub></i> of 12.760° at nozzle pressure ratio (NPR) = 4 and secondary pressure ratio (SPR) = 1.5. Although the second port introduces a slight reduction in η, consistent performance across a range of NPRs indicates robustness in off-design conditions. The study concludes that the optimal operating condition for the DTN is at NPR = 4 and SPR = 1, achieving a δ<i><sub>p</sub></i> of 8.792° with a 2.2% secondary injection mass flow rate and maximum η of 3.954%.