Parametric Analysis of Pylon-Aided Fuel Injection in Scramjet Engines

2013 ◽  
Vol 135 (2) ◽  
Author(s):  
Mitchell R. Pohlman ◽  
Robert B. Greendyke
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Supersonic Flow ◽  
Performance Analysis ◽  
Parametric Analysis ◽  
Fuel Injection ◽  
Absolute Size ◽  
Plume Area ◽  
Air Mixing ◽  
Computational Fluid Dynamics Cfd

The current study investigates means to increase the efficiency of fuel-air mixing into supersonic flow upstream of a flame holding cavity. Previous work has shown much promise in increasing the penetration and mixing of a fuel-air mixture into the freestream by injecting fuel behind small triangular pylons. The current paper examines 21 triangular pylons of varying widths, heights, and lengths with a computational fluid dynamics (CFD) performance analysis. Increasing the height of the pylons increased the penetration, flammable fuel plume area, and floor gap. Variations in pylon length had no discernible impact on the fuel-air mixing metrics. Aerodynamic loses were minimal for all pylon configurations and did not correlate to the absolute size of the pylons tested.

Three-Dimensional CFD Analysis of Gas Mixing in Large Volumes

2001 ◽  
Author(s):  
Brian L. Smith
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Steady State ◽  
Three Dimensional ◽  
Air Injection ◽  
Cfd Analysis ◽  
Gas Mixing ◽  
Air Mixing ◽  
Computational Fluid Dynamics Cfd ◽  
Pure Steam

Abstract The paper describes three-dimensional Computational Fluid Dynamics (CFD) calculations undertaken in support of analyses of steam/air mixing which takes place in the drywell volumes of the 1/40th-scale ESBWR1 mock-up facility PANDA under conditions of symmetric steam/air injection and asymmetric outflow. Steady-state simulations for pure steam conditions illustrate how the flow streams mix to ensure balanced outflow conditions to the condensers. A transient calculation has also been performed to examine how air released from solution in the PANDA boiler would ultimately accumulate in the separate condenser units. Results provide a possible explanation for the rundown in performance of one of the condensers which was repeatedly observed in some of the PANDA tests.

Performance analysis of a water ejector using Computational Fluid Dynamics (CFD) simulations and mathematical modeling

Energy ◽  
2021 ◽  
pp. 119779
Author(s):  
Victor Jorge de Oliveira Marum ◽  
Lívia Bueno Reis ◽  
Felipe Silva Maffei ◽  
Shahin Ranjbarzadeh ◽  
Ivan Korkischko ◽  
...  
Keyword(s):  
Mathematical Modeling ◽  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Performance Analysis ◽  
Cfd Simulations ◽  
Computational Fluid Dynamics Cfd

scholarly journals Validation of a Grid Independent Spray Model and Fuel Chemistry Mechanism for Low Temperature Diesel Combustion

2009 ◽  
Vol 1 (3) ◽  
pp. 283-316 ◽  
Author(s):  
Takeshi Yoshikawa ◽  
Rolf D. Reitz
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Low Temperature ◽  
Fuel Injection ◽  
Fuel Spray ◽  
Computational Time ◽  
Low Temperature Combustion ◽  
Computational Mesh ◽  
Temperature Combustion ◽  
Computational Fluid Dynamics Cfd

Spray and combustion submodels used in a Computational Fluid Dynamics (CFD) code, KIVACHEMKIN, were validated for Low Temperature Combustion (LTC) in a diesel engine by comparing measured and model predicted fuel spray penetrations, and in-cylinder distributions of OH and soot. The conditions considered were long ignition delay, early and late fuel injection cases. It was found that use of a grid independent spray model, called the GASJET model, with an improved n-heptane chemistry mechanism can well predict the heat release rate, not only of the main combustion stage, but also of the cool flame stage. Additionally, the GASJET model appropriately predicts the distributions of OH and soot in the cylinder even when the resolution of the computational mesh is decreased by half, which significantly reduces the required computational time.

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