scholarly journals A Computational Fluid Dynamic Study of Developed Parallel Stations for Primary Fans

Processes ◽  
2021 ◽  
Vol 9 (9) ◽  
pp. 1607
Author(s):  
Juan Pablo Hurtado ◽  
Gabriel Reyes ◽  
Juan Pablo Vargas ◽  
Enrique Acuña
Keyword(s):  
Computational Fluid Dynamic ◽  
Energy Cost ◽  
Fluid Dynamic ◽  
Shock Pressure ◽  
Cfd Model ◽  
Blade Angle ◽  
Cfd Simulations ◽  
Pressure Losses ◽  
Operating Points ◽  
Over Time

A Computational fluid dynamic (CFD) model was developed considering three geometries for primary parallel fan stations that have already been developed, implemented, and are currently in operation within Chilean mines. To standardize the comparison, the same primary fan was used in all the simulations with a unique set of settings (speed, blade angle, and density). The CFD representation was used to determine the operating point per configuration and compare the performances in terms of airflow and pressure delivered. This approach allowed ranking primary fan station geometry based on resistance curve and energy consumption of the fan. This paper presents the results obtained through the CFD simulations and the corresponding primary fans operating points of each configuration: symmetrical branches (SB), overlap branches (OB), and run around (RA) bypass. The RA configuration was identified as the best-performing station geometry on the lowest frictional and shock pressure losses, highest airflow delivery, and lowest energy cost. The results are discussed, considering pressure, velocity, and vector contours to understand the fluid dynamics phenomena occurring inside the station. The capital cost involved in the development of each primary parallel station was considered in the analysis in addition to the energy cost to determine the economic configuration over time.

Smoke Simulation in an Underground Train Station Using Computational Fluid Dynamic

2014 ◽  
Vol 663 ◽  
pp. 366-372 ◽  
Author(s):  
Zambri Harun ◽  
Muhammad Saiful bin Sahari ◽  
Taib Iskandar Mohamad
Keyword(s):  
Computational Fluid Dynamic ◽  
Fire Safety ◽  
Fluid Dynamic ◽  
Fire Department ◽  
Cfd Simulations ◽  
Train Station ◽  
Hazardous Gases ◽  
Design Software ◽  
Underground Station ◽  
Safety Systems

The design of the ventilation and fire safety systems for the Johor Bahru Sentral, a semi-underground train station, part of the Integrated Custom, Immigration and Quarantine Complex (ICIQ) is based on normal Malaysian Standards (MS), British Standards and the local fire department’s requirements. However, the large and complex space in the underground station coupled with scheduled diesel-powered locomotives which frequent the station by stopping or passing require detailed simulations. Both ventilation and the fire safety systems employ Computational Fluid Dynamic (CFD) methods to provide realistic balance against the typical calculations based on spread sheets and certain design software. This study compares smoke simulations results performed by the mechanical and fire consultants with the simulations carried out through this project. An assumption of a locomotive catches fire near the main platform is made. The burning locomotive is the source of the smoke while the occupants on platforms and waiting areas are the subjects to escape safely. The process of the simulation includes modelling and meshing processes on the structure of the railway station imported from Inventor CAD Autodesk software drawing. The CFD simulations are performed using Star-CCM+. The smokes flow around the building with buoyancy forces and extracted via exhaust fans. Through these simulations, we found that when a locomotive catches fire, the passengers could evacuate the building safely before the fire department machinery arrives. Furthermore, we notice that the ventilation fans activation based on detection of hazardous gases may not be efficient way to remove the latter. A schedule clean-up sync with train arrivals effectively removes toxic gas.

Improved Prediction of Indoor Contaminant Distribution for Entire Buildings

2002 ◽  
Author(s):  
Jinchao Yuan ◽  
Jelena Srebric
Keyword(s):  
Computational Fluid Dynamic ◽  
Fluid Dynamic ◽  
The Other ◽  
Zone Model ◽  
Cfd Model ◽  
Combined Model ◽  
Contaminant Distribution

This paper presents a study on improvements of multi-zone models for predicting building contaminant distribution by combining a multi-zone model with a Computational Fluid Dynamic (CFD) model. The motivation is to avoid the long computations in the CFD model that are required for predicting concentrations in entire buildings. Two cases are investigated using the combined model and the results are compared to reliable experimental or CFD data. The comparisons show that the combined model provides better results than the multi-zone model alone in one of the cases, while in the other no major improvements were observed. Further investigation and development of the combined model is needed.

A Multizone Model of an Economizer in a 600 MW Boiler Unit

2012 ◽  
Vol 134 (4) ◽  
Author(s):  
Wang Jizhou ◽  
Zhang Yanping ◽  
Li Yu ◽  
Huang Shuhong
Keyword(s):  
Steady State ◽  
Computational Fluid Dynamic ◽  
Fluid Dynamic ◽  
Computational Cost ◽  
Distribution Characteristics ◽  
Boiler Unit ◽  
Cfd Model ◽  
Distribution Parameters ◽  
Multizone Model ◽  
Operational Data

In this paper, a multizone model is developed to investigate the performance of an economizer under all conditions. The model primarily determines the economizer’s distribution parameters under all conditions with a small computational cost. Both the steady-state and dynamic behavior are calculated. These results are shown to be accurate and reliable using a computational fluid dynamic (CFD) model and the operational data obtained from a 600 MW boiler unit in Hubei province, China. Additionally, the model is used to predict the distribution characteristics during some fault conditions.

A Study on the Influence of Intake Geometry on the Turbocharger Compressor Performance

2018 ◽  
Author(s):  
Dhinagaran Ramachandran ◽  
Sreenivasa Somashekarappa ◽  
Balamurugan Mayandi ◽  
Ranganathan Reddy Shanmugam ◽  
Saravanan Boolingam ◽  
...  
Keyword(s):  
Total Pressure ◽  
Combustion Engine ◽  
Fluid Dynamic ◽  
Cfd Simulations ◽  
Pressure Losses ◽  
Inlet Distortion ◽  
Compressor Performance ◽  
Compressor Map ◽  
Compressor Efficiency ◽  
Insight Into

Increasing demands on the improvement of the performance of the turbocharged internal combustion engine places in turn higher demands on the efficiency of turbochargers. The aerodynamic performance of the turbocharger compressor is influenced by the uniformity of airflow that the impeller receives. Typically, the compressor performance is measured in a gas stand with straight and conical adaptors. The ducting before the compressor in a vehicle is invariably more complex with additional bends than in the gas stand test setup. This creates differences in performance of engine compared to the performance based on the compressor map obtained from the gas stand. In this study, Computational Fluid Dynamic (CFD) simulations are performed for a compressor with a baseline intake that has a single bend and the results are compared with the test data. Subsequently tests and CFD simulations are performed with ducts having additional bends. The CFD results provide insight into the losses arising in the intake. Additional bends and the nature of bends add to total pressure losses and distorts the flow going into the impeller. The inlet distortion and total pressure losses are quantitatively expressed in terms of a set of parameters in order to facilitate comparison of different designs. The intake geometry is modified to improve the overall compressor efficiency by reducing pressure drop and inlet distortion.

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