Generator Room Ventilation Applying Fans Simulation, ANSYS Fluent Training
$11.00
The present problem simulates the airflow around several generators and the effect of a set of fans on them, using ansys fluent software.
This product includes Mesh file and a Training Movie.
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Description
Project Description
The present problem simulates the airflow around several generators and the effect of a set of fans on them, using ansys fluent software. Generators are generally a mechanical device that can convert mechanical energy into AC or DC electrical energy. This process of generating electricity is done by changing the magnetic field on a conductor. An alternator is a part of a generator in which a magnetic field (rotor) rotates around an armature (stator). In this simulation, a shed is modeled as the location of 30 rows of generators. The open air flow enters the interior of the generator room from the roof of the shed and in front of each of the generator devices.
On the other hand, in this simulation, an attempt has been made to consider two groups of large and small fans inside this shed and in the areas around the alternator generator to measure the effect of the fan on the air flow around the generator. Large fans are modeled in a circle with a diameter of 1400 mm in the space between the two generators and small fans are designed in a square shape with a side of 900 mm and behind each generator. Large fans have a volume flow equivalent to 31000 Ls-1 and small fans have a volume flow equivalent to 12000 Ls-1, which by dividing these volumetric flow rates by the density of air flow, the mass flow rate of each Large and small fans are equal to 37.975 kg.s-1 and 14.7 kg.s-1, respectively.
Project Description
To simulate the air inlet flows, the inlet pressure condition equivalent to the relative pressure of 0 pascal is used and to simulate the outlet air flow, the outlet pressure condition is applied. To determine the amount of exhaust air flow from each of the fans in the pressure outlet boundary condition, the target mass flow mode is used; Thus, the amount of outlet air flow rate is defined based on a range of pressure values between the maximum and minimum pressure values. In general, the purpose of this work is to investigate the speed and volume of air in the areas around the alternator behind the generator and the space between the devices.
The effect of the change in height at which the large fans are installed has also been measured on the airflow. In fact, the large fans in the three different tests were designed at different heights above ground level.
Generator Room Geometry & Mesh
The current model is designed in three dimensions using Design Modeler software. The model includes a generator room (shed) in which 30 generators are located in series in two halves of the shed. Behind each of the generators, there is a small square fan and in the space between each of the two adjacent fans, there is a big circular fan with a diameter of 1400 mm. This project has been done in three modes in which the height of large fans is different. Also, sections as open air ducts without using a fan have been installed on the roof of the shed and also in the front part of the generators.
The meshing of the model has been done using ANSYS Meshing software, and the mesh type is unstructured. The element number is 5033223. The following figure shows the mesh.
Generator Room Ventilation CFD Simulation
We consider several assumptions to simulate the present model:
- We perform a pressure-based solver.
- The simulation is steady.
- The gravity effect on the fluid is ignored.
The following table represents a summary of the defining steps of the problem and its solution:
Models | ||
Viscous | k-epsilon | |
k-epsilon model | standard | |
near wall treatment | standard wall functions | |
Boundary conditions | ||
Main Inlet | Pressure Inlet | |
gauge pressure | 0 pascal | |
Ceiling Inlet | Pressure Inlet | |
gauge pressure | 0 pascal | |
Small Fan | Pressure Outlet | |
gauge pressure | 0 pascal | |
target mass flow rate | 14.7 kg.s^{-1} | |
upper limit of absolute pressure | 5000000 pascal | |
downer limit of absolute pressure | 1 pascal | |
Large Fan | Pressure Outlet | |
gauge pressure | 0 pascal | |
target mass flow rate | 37.975 kg.s^{-1} | |
upper limit of absolute pressure | 5000000 pascal | |
downer limit of absolute pressure | 1 pascal | |
Walls | Wall | |
wall motion | stationary wall | |
Methods | ||
Pressure-Velocity Coupling | Simple | |
Pressure | second order | |
momentum | second order upwind | |
turbulent kinetic energy | first order upwind | |
turbulent dissipation rate | first order upwind | |
Initialization | ||
Initialization methods | Hybrid |
Results
At the end of the solution process, two-dimensional and three-dimensional contours related to pressure and velocity in three different modes, including three different heights, were obtained from the location of large fans. Two-dimensional contours are defined in two sections Y-Z and X-Y.
There is a mesh file in this product. By the way, the Training File presents how to solve the problem and extract all desired results.
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