Flow Separation Control of an Ultra-compact S-shaped Convergent-divergent Nozzle Using the Blowing Method

Shi, J. W.; Hui, Z. H.; Zhou, L.; Wang, Z. X.

doi:10.47176/jafm.17.6.2398

Flow Separation Control of an Ultra-compact S-shaped Convergent-divergent Nozzle Using the Blowing Method

Document Type : Regular Article

Authors

School of Power and Energy, Northwestern Polytechnical University, Xi’an, Shaan Xi Province, 710072, China

10.47176/jafm.17.6.2398

Abstract

To enhance the aerodynamic performance of an ultra-compact S-shaped convergent-divergent nozzle and mitigate flow separation, numerical simulations were conducted using FLUENT software. The study employed the k-ω shear stress transport turbulent model to investigate a flow control method involving blowing. Detailed analysis was performed on the impact of blowing position, angle, and pressure ratio on controlling flow separation. The findings indicate that as the blowing position moves backward, the flow separation area diminishes. Additionally, downstream flow separation ceases at smaller blowing angles within the separation zone. However, excessively large blowing angles tend to create an “aerodynamic wall,” causing significant upstream flow loss and nozzle performance degradation. Enhancing the blowing pressure ratio, given proper mixing with low-energy fluid and no interference with the main flow, can improve the nozzle's aerodynamic performance. Under the optimal blowing scheme, the total pressure recovery coefficient and thrust coefficient are increased by approximately 0.52% and 3.75%, respectively, when compared with those of the reference nozzle.

Keywords

Main Subjects

Mixing and Jets

References

Chen, Z. J., & Wang, J. J. (2012). Numerical investigation on synthetic jet flow control inside an S-inlet duct. Science China Technological Sciences, 55, 2578–2584. https://doi.org/10.1007/s11431-012-4970-y

Crowe, D. S., & Martin, C. L. (2015). Hot streak characterization in serpentine exhaust nozzles. Aiaa/sae/asee Joint Propulsion Conference.

Crowe, D. S., & Martin, C. L. (2019). Hot streak characterization of high-performance double-serpentine exhaust nozzles at design conditions. Journal of Propulsion and Power, 35(3), 501–511. https://doi.org/10.2514/1.B37235

He, P., & Dong, J. Z. (2015). Effect of slot orientation on synthetic jet-based separation control in a serpentine inlet. Journal of Aerospace Power, 30(2), 306–314. https://doi.org/10.13224/j.cnki.jasp.2015.02.007

Hui, Z. H., Shi, J. W., Zhou, L., Wang, Z. X., & Liu, Y. Q. (2021) Experimental investigation of serpentine nozzles for turbofan. Aerospace Science and Technology, 117, 106892. https://doi.org/10.1016/j.ast.2021.106892

Jing, J. P., & Guo, R. W. (2007). Experiment of boundary layer suction in serpentine inlet under ground running. Journal of Nanjing University of Aeronautics and Astronautics, 39(1), 30–36. https://doi.org/10.3969/j.issn.1005-2615.2007.01.007

Kunik, W. G. (1986). Application of a computational model for vortex generators in subsonic internal flows. AIAA/ASME/SAE/ASEE 22nd Joint Propulsion Conference. Huntsville, Alabama.

Liu, L. (2015). Investigation of S shaped inlet distortion control and its impact on the flow field of the rear transonic fan-stage [Ph. D. thesis, Harbin Institute of technology], Harbin, China.

Reddy, N. K., & Sankar, M. (2020). Buoyant convective transport of nanofluids in a non-uniformly heated annulus. Journal of Physics: Conference Series, 1597, 012055. https://doi.org/10.1088/1742-6596/1597/1/012055

Sang, Z. K. (2010). Optimal design and active flow control of half flush-mounted S-duck inlet [Master thesis, Harbin Institute of technology], Harbin, China.

Sankar, M., Girish, N., & Siri, Z. (2018). Fully developed magnetoconvective heat transfer in vertical double-passage porous annuli. Springer Transactions in Civil and Environmental Engineering, 217–249. https://doi.org/10.1007/978-981-10-8773-8_7

Sankar, M., Kiran, S., Ramesh, G. K., & Makinde, O. D. (2017). Natural convection in a non-uniformly heated vertical annular cavity. Defect and Diffusion Forum, 377, 189–199. https://doi.org/10.4028/www.scientific.net/DDF.377.189

Sankar, M., Pushpa, B. V., Prasanna, B. M. R., & Do, Y. (2016). Influences of size and location of a thin baffle on natural convection in a vertical annular enclosure. Journal of Applied Fluid Mechanics, 9, 2671–2684. https://doi.org/10.29252/jafm.09.06.25501

Song, B. F., Feng, X. Q., & Hu, Y. (2010). The consideration of the next generation fighter under air and space combat environment. Advances in Aeronautical Science and Engineering, 1(2), 107–111. https://doi.org/10.16615/j.cnki.1674-8190.2010.02.020

Sun, B. G., Li, F., & Qiu, Z. (2011). Research on infrared radiation characteristics of binary nozzle jet. National Conference on Optoelectronics and Quantum Electronics Technology, China.

Sun, X. L., Wang, Z. X., & Zhou, L. (2014). Experimental and computational investigation of double serpentine nozzle. Proceedings of the Institution of Mechanical Engineers, Part G: Journal of Aerospace Engineering, 229(11), 2035–2050. https://doi.org/10.1177/0954410014564402

Swamy, H. A. K., Sankar, M., & Reddy, N. K. (2022). Analysis of entropy generation and energy transport of cu-water nanoliquid in a tilted vertical porous annulus. International Journal of Applied and Computational Mathematics, 8, 1-10. https://doi.org/10.1007/s40819-021-01207-y

Vakili, A. D., Wu J. M., & Liver P. (1985). Flow control in a diffusing S-duct. AIAA ShearFlow Control Conference, Boulder, Colorado

Vikas, K., & Farrukh, A. (2003). Use of supersonic microjets for active separation control in diffusers. 33rd AIAA Fluid Dynamics Conference and Exhibit, Oriando, Florida.

Wang, Z. X., Yu, M. Z., & Shi, J. W. (2018). The research on flow mechanism and flow control method of ultra-compact serpentine convergent divergent nozzle. Journal of Engineering Thermophysics, 39(8), 1718–1724. https://doi.org/CNKI:SUN:GCRB.0.2018-08-012

Wise, K. A. (2023). X-45 program overview and flight test status. AIAA Unmanned Unlimited Systems, Technologies, and Operations. AIAA-2003-6645.

Xu, D. G, Sang, J. H., & Luo, M. D. (2012). Research on application of UAV’s infrared stealth technology. Infrared and Laser Engineering, 41(12), 3154–3159. https://doi.org/10.3969/j.issn.1007-2276.2012.12.004

Zhao, Z. S., Dong, J., & Guo, C. P. (2010). Numerical simulation and optimization of inlet jet flow control. Aerodynamic Research and Experiment, 2, 1–8. https://doi.org/10.13224/j.cnki.jasp.2010.02.017

Zhao, Z. S., Dong, J., & Guo, C. P. (2011). Parameters optimization of passive flow control device for a dual S inlet by numerical vortex generator model. Acta Aerodynamica Sinica, 29(1), 22–26. https://doi.org/10.3969/j.issn.0258-1825.2011.01.004

Zhou, L., Meng, Y. B., & Wang, Z. X. (2021). Numerical study on flow characteristics of serpentine convergent divergent nozzle. Journal of Propulsion Technology, 42(1), 103–113. https://doi.org/10.13675/j.cnki.tjjs.200271