Numerical investigation of compressible flow around nose cone with Multi-row disk and multi coolant jets

Self Cite

The main challenge for the advancement of current high-speed automotives is aerodynamic heating. In this study, the application of lateral jet for thermal protection of the high-speed automotives is extensively studied. The simulation of the lateral coolant jet is done via Computational fluid dynamic at high-velocity condition. Finding optimum jet configuration for reduction of the aerodynamic heating is the main goal of this research. Two different coolant jets (Helium and Carbon dioxide) are investigated as coolant jet and flow study and fuel penetration mechanism are fully presented. In addition, the thermal load on the main body of nose cone is compared for different configurations. Our results specify that the injection of lateral jet near the tip of spike is effective for thermal protection of main body via deflection of bow shock. Also, Carbon dioxide jet with lower diffusivity is more effective for the protection of forebody with multi-row disk from sever aerodynamic heating.

Section: Resultssupporting

confidence: 85%

Influence of lateral single jets for thermal protection of reentry nose cone with multi-row disk spike at hypersonic flow: computational study

Shi

Cheng

Alizadeh

et al. 2023

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“…The shock wave formation is inherently happened in our model and consequently, the energy equation must be considered in our modeling 41 , 42 . Meanwhile, the turbulence effects are also important in our model and SST model of turbulence is considered for the calculation of viscosity 31 , 42 , 43 . The secondary gas of hydrogen is also modeled as fuel jet and mass transport equation is also used with Fick.…”

Section: Governing Equations and Numerical Methodologymentioning

confidence: 99%

Application of multi-extruded fuel injectors for mixing enhancement of hydrogen gas at scramjet engine: computational study

Abdollahi,

Ranjbar,

Aminian

et al. 2023

Scramjet engines are considered a highly promising technology for improving high-speed flight. In this study, we investigate the effects of using multi-extruded nozzles on fuel mixing and distribution inside the combustion chamber at supersonic flow. Additionally, we explore the impact of an inner air jet on fuel mixing in annular nozzles. To model fuel penetration in the combustor, we employ a computational technique. Our study compares the roles of three different extruded injectors on fuel diffusion and distribution at supersonic cross-flow. Our findings reveal that the use of an inner air jet increases fuel mixing in the annular jet, while the use of extruded nozzles improves fuel distribution by enhancing the vortices between injectors. These results demonstrate the potential benefits of incorporating multi-extruded nozzles and inner air jets in the design of scramjet engines.

“…This turbulence results in the breakup of larger fuel droplets into smaller droplets, enhancing the atomization process. Smaller fuel droplets have a larger surface area, promoting better mixing with air and improving combustion efficiency 9 – 11 .…”

Section: Introductionmentioning

confidence: 99%

Using shock generator for the fuel mixing of the extruded single 4-lobe nozzle at supersonic combustion chamber

Alizadeh,

Jasim,

Sohrabi

et al. 2024

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The importance of the fuel injection configuration on the propulsion efficiency of high-speed vehicles is apparent. In this article, the use of an annular extruded 4-lobe nozzle for the injection of fuel jet in a supersonic combustor of a scramjet engine in the existence of a shock generator is examined. The main aim of this study is to obtain the efficient jet arrangement for efficient fuel mixing inside the engine of hypersonic vehicles. A numerical approach is used to model the supersonic air stream and cross-jet flow with the SST turbulence model. The role of nozzle altitude and internal air jet on the fuel mixing of the hydrogen within the high-speed domain are disclosed. The importance of the horseshoe vortex and counter-rotating vortex on the fuel distribution is also presented. Our results show that the usage of a coaxial jet instead of an annular jet would increase fuel mixing by more than 40% in the combustion chamber.