The Design – Jet Combustion Chamber Flow Rates Simulation | ANSYS Fluent
Over the past twenty years, there has been a significant increase in the use of gas turbines in various industries, power plants, planes, and rockets. The efficiency of turbines directly affects fuel consumption and dramatically reduces cost efficiency. The gas turbine consists of several parts, including an air inlet, a compressor for increasing air pressure, the combustion chamber in which the combustion of fuel and air takes place, the turbine for extraction of energy, and finally, a gas outlet. To increase the efficiency of gas turbines, we need to examine each component and part. Combustion in the chamber is one of the most important parts of the gas turbine. The flow inside the combustion chamber also involves chemical reactions. Therefore, the design of the combustion chamber is very important. The computational fluid dynamics analysis of the combustion chamber is absolutely essential and helps to better understand the combustion and flow patterns. The results of simulations will reduce the cost of construction, and by increasing performance, we can contribute to a healthier environment.
The simulation of the combustion and combustion chamber in a gas turbine engine was carried out in this project. This combustion chamber is related to the gas turbine with a nominal capacity of 605 megawatts and an efficiency of 62.22%, one of which is a heavy-duty gas turbine, which is widely used in gas plants and the combined cycle to move power generators. The turbine is manufactured by engineering and licensed by GE. The fuel used is liquid fuels, gasoline, heavy fuel oil, and gas fuels with a variety of thermal values, in particular natural gas.
In this analysis, it has been tried to analyze the simulation of jet combustion chamber flow rates, using the ANSYS Fluent software.
Geometry & Grid
The geometry required for this analysis was generated by Ansys Design Modeler software. The meshing required for this analysis was also generated by Ansys Meshing software. The mesh type used in this analysis is unstructured. The total number of volume properties for geometry is 3,2519e-002 m³.
In this analysis, the k-epsilon (2 equation) turbulence viscosity model is used to check the fluid flow. The standard wall function is used near the wall.
The flow of primary air input design modeler geometry for this analysis is considered as a mass flow rate and is 0.0025 kg/s. The turbulence of the design modeler is set with an intensity equal to 10 %. The turbulence viscosity ratio of the design modeler is set with a viscosity ratio of 10.
The flow of secondary air input design modeler geometry for this analysis is considered as a mass flow rate and is 0.0025 kg/s. The turbulence of the design modeler is set with an intensity equal to 10 %. The turbulence viscosity ratio of the design modeler is set with a viscosity ratio of 10.
The flow output range is also considered as a pressure outlet for the flow output region and gauge pressure is equal to 0. The inner wall is also considered a Stationary Wall.
Discretization of Equations
In this analysis, high-resolution is used for the advection scheme of the basic settings. In this analysis, the first-order is used for turbulence numerics. In this analysis, the residual type of convergence criteria is RMS and the residual target of convergence criteria is 1.E-3.
The results are presented as temperature contours as well as streamlines.
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