Article
Engineering, Aerospace
Ji-Yeul Bae, Jihyuk Kim, Namkyu Lee, Hyung Mo Bae, Hyung Hee Cho
Summary: This paper investigates the surface heat transfer caused by the interaction of a jet and a supersonic crossflow near the jet injection hole. Experimental results show that the heat transfer augmentation is the highest near the hole, and is closely related to the momentum ratio change.
AEROSPACE SCIENCE AND TECHNOLOGY
(2021)
Article
Engineering, Aerospace
Ziao Zhang, Sean F. McCreton, Manuj Awasthi, Angus O. Wills, Danielle J. Moreau, Con J. Doolan
Summary: This study experimentally investigates Transverse Jets In Supersonic Crossflow using flow visualization, revealing shedding vortices and their interaction with adjacent shock structures. The presence of moving shocks in the helium TJISC enhances flow field unsteadiness and alters pressure distributions downstream, with the penetration depth slightly increased compared to air and argon cases.
AEROSPACE SCIENCE AND TECHNOLOGY
(2021)
Article
Engineering, Aerospace
Chen-Liang Qiao, He-Yong Xu, Jing Li, Han-Dong Hu
Summary: This study investigates the sonic transverse jet on a high-speed missile and analyzes the effects of injection pressure ratio and injection angle on the jet. The instability of jet-crossflow interaction and its influence on the control system are also studied. The findings provide valuable insights for the design of control systems.
AEROSPACE SCIENCE AND TECHNOLOGY
(2022)
Article
Engineering, Aerospace
Guoyan Zhao, Jianhui Du, Hongxi Yang, Tao Tang, Mingbo Sun
Summary: An approach combining numerical, experimental, and theoretical analyses was used to study the effects of injection parameters on the flame flashback phenomenon. The simulations showed good agreement with experimental observations. Higher fuel equivalence ratios, sharper injection degrees, longer premixing distances, and multiple injectors promoted fuel-flow interactions, enhancing mixing efficiency and fuel penetration. Changes in thermally choked flow and temperature fluctuation thresholds were found to be important factors influencing flame flashback.
AEROSPACE SCIENCE AND TECHNOLOGY
(2022)
Article
Engineering, Aerospace
Changhai Liang, Mingbo Sun, Yuhui Huang, Yuan Liu, Guoyan Zhao, Yixin Yang, Jiajian Zhu, Hongbo Wang, Fan Li, Guangwei Ma
Summary: This study focused on the scale effect of transverse gas fuel injected into a Ma=2.95 supersonic flow. NPLS and oil flow techniques were used to study flow structures and jet penetration, while the RANS model was employed to investigate fuel mixing characteristics. Turbulent boundary layer was found to play a crucial role in the scale effect of jet penetration and mixing characteristics.
AEROSPACE SCIENCE AND TECHNOLOGY
(2021)
Article
Engineering, Aerospace
Jan Siemen Smink, Harry W. M. Hoeijmakers, Cornelis H. Venner
Summary: This study investigated the mixing process of tandem dual-jet injection in a supersonic wind tunnel and established an empirical similarity relation between the jet shear layer position and the jet momentum and spacing.
Article
Computer Science, Interdisciplinary Applications
Amin Hassanvand, M. Barzegar Gerdroodbary, Amir Musa Abazari
Summary: The study investigates the effects of multiple hydrogen jets on an inclined surface in supersonic airflow, finding that mixing performance improves at high jet pressure and with increasing angle of the exterior surface. The study also highlights the significant impact of power and slant of the separation shock on the size of the mixing zone.
INTERNATIONAL JOURNAL OF MODERN PHYSICS C
(2021)
Article
Mechanics
R. Sebastian, A-M Schreyer
Summary: This study investigates the influence of jet spacing on the control effectiveness of air-jet vortex generators in supersonic flow. Using large-eddy simulations and experimental visualizations, the study analyzes the effects of different jet spacings on flow structures, vortical structures, and boundary-layer statistics. The insights gained from this study are crucial for the development of efficient control setups.
JOURNAL OF FLUID MECHANICS
(2022)
Article
Mechanics
Imran Rasheed, Debi Prasad Mishra
Summary: A high-speed compressible solver is developed by coupling OpenFOAM(R) and Cantera 2.5.0, which can solve detailed chemical reaction mechanisms. A sonic hydrogen jet discharging from a circular injector into a high enthalpy supersonic crossflow over a flat plate is selected as a test case to validate the solver and inspect the capability of RANS in predicting flame characteristics in high-speed flows.
Article
Engineering, Aerospace
Robin Sebastian, Anne-Marie Schreyer
Summary: Forced jet injection can effectively control flow separation by enhancing mixing and lateral spreading, leading to improved separation control. The injection induces periodic oscillations and large-scale rotation of the major vortex. High-frequency forced jet injection is more efficient in controlling flow separation, but periodic oscillations can cause faster dissipation and breakdown of the vortical structures.
Article
Chemistry, Physical
Yuelei Zhang, Puneet Rana, R. Moradi, Zhixiong Li
Summary: This study investigates the impact of coaxial injector arrays of hydrogen/air multi-jet on fuel mixing performance, aiming to optimize fuel distribution and penetration downstream in different operating conditions. The results show that the injection of coaxial air/hydrogen jet significantly enhances mixing downstream and the fuel jet space of 7 Dj offers maximum fuel mixing.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Article
Thermodynamics
Jiang-Fei Yu, Tao Tang, Jin-Cheng Zhang, Da-Peng Xiong, Hong-Bo Wang, Ming-Bo Sun
Summary: Numerical simulation is an important research method in the field of supersonic flow. This study focuses on the accuracy and reliability of numerical simulations of transverse supersonic jet in supersonic free flow. The results show that improving the accuracy of the scheme does not effectively improve the calculation results, while choosing an appropriate turbulence model can be helpful to improve the calculation accuracy. The conclusions of this study can provide support for determining the numerical model method and error analysis in the numerical simulation of jet flow mixing in supersonic flow field.
ADVANCES IN MECHANICAL ENGINEERING
(2023)
Article
Engineering, Aerospace
Majie Zhao, Taohong Ye, Qinling Li
Summary: Large-eddy simulations combined with the partially stirred reactor combustion model were used to investigate the turbulent mixing, combustion mode, and flame stability of a sonic hydrogen jet injecting into high-enthalpy supersonic crossflow. The study identified ignition processes influenced by shock and reflected shock effects.
Article
Engineering, Aerospace
Shenghao Yu, Bifeng Yin, Qinsheng Bi, Hekun Jia, Chen Chen
Summary: The study focuses on transverse jet breakup behaviors and droplet size distribution for circular and elliptical orifices in supersonic crossflow. Results show that elliptical nozzles have smaller jet penetration depth, more surface waves, and smaller droplet diameter compared to circular nozzles, especially at higher injection pressures.
Article
Mechanics
Tao Tang, Zhenguo Wang, Jiangfei Yu, Yuhui Huang, Mingbo Sun, Hongbo Wang, Guoyan Zhao, Yixin Yang, Dapeng Xiong
Summary: Large-eddy simulations have been used to investigate fuel-jet mixing and combustion characteristics in high-enthalpy inflow with trace-gas species. The results show that the presence of atomic oxygen and nitrous oxide has a significant influence on ignition delay times and flame distribution. The complex shock-wave system generated by the transverse jet enhances mixing and induces combustion.
Article
Engineering, Mechanical
Ashwani Assam, Nikhil Narayan Kalkote, Vatsalya Sharma, Vinayak Eswaran
JOURNAL OF FLUIDS ENGINEERING-TRANSACTIONS OF THE ASME
(2018)
Article
Engineering, Aerospace
Vatsalya Sharma, Vinayak Eswaran, Debasis Chakraborty
AEROSPACE SCIENCE AND TECHNOLOGY
(2020)
Article
Engineering, Aerospace
Vatsalya Sharma, Vinayak Eswaran, Debasis Chakraborty
AEROSPACE SCIENCE AND TECHNOLOGY
(2020)
Article
Engineering, Aerospace
Vatsalya Sharma, Vinayak Eswaran, Debasis Chakraborty
AEROSPACE SCIENCE AND TECHNOLOGY
(2020)
Article
Engineering, Aerospace
Vatsalya Sharma, Vinayak Eswaran, Debasis Chakraborty
Summary: This paper numerically studies the effect of isolator design on shock-augmented mixing in a supersonic Ramjet engine. The results show that changing the length of the isolator section has limited impact on the mixing efficiency. The authors conclude that the isolator dimensions can be chosen based on flow homogenization considerations.
AEROSPACE SCIENCE AND TECHNOLOGY
(2022)
Article
Engineering, Aerospace
Andrea Lani, Vatsalya Sharma, Vincent F. Giangaspero, Stefaan Poedts, Alan Viladegut, Olivier Chazot, Jasmine Giacomelli, Johannes Oswald, Alexander Behnke, Adam S. Pagan, Georg Herdrich, Minkwan Kim, Neil D. Sandham, Nathan L. Donaldson, Jan Thoemel, Juan C. M. Duncan, Johannes S. Laur, Sonja I. Schlachter, Rainer Gehring, Matthieu Dalban-Canassy, Julien Tanchon, Veit Grosse, Penelope Leyland, Angelo Casagrande, Manuel La Rosa Betancourt, Marcus Collier-Wright, Elias Boegel
Summary: This paper outlines the initial development of a novel magnetohydrodynamic (MHD) plasma control system that aims to mitigate the heat loads and communication blackout during planetary atmospheric entry. The system utilizes high-temperature superconductors (HTS) to generate strong magnetic fields and push away the ionized gas layer, reducing heat loads and improving communication. This technology has the potential to reduce the use of expensive and non-reusable thermal protection systems, improving the efficiency of spacecraft during atmospheric entry.
JOURNAL OF SPACE SAFETY ENGINEERING
(2023)