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.

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.

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.

scholarly journals POLA ALIRAN FLUIDA PADA DELIQUIDISER

2018 ◽  
Vol 5 (2) ◽  
pp. 237-241
Author(s):  
Ragil T Indrawati
Keyword(s):  
Steady State ◽  
Drag Coefficient ◽  
Mass Flow ◽  
Computational Fluid Dynamic ◽  
Liquid Velocity ◽  
Fluid Dynamic ◽  
Solid Content ◽  
Working Pressure

ujuan penelitian ini untuk mengetahui fenomena pola aliran fluida yang terjadi pada deliquidiser serta properties yang ada pada daerah inlet, drain, oil outlet dan gas outlet. Penelitian dilakukan menggunakan pendekatan simulasi pemodelan matematis Computational Fluid Dynamic (CFD) menggunakan software Ansys. Dalam penelitian ini diasumsikan bahwa model akan disimulasikan skala 1:1 pada 2 phase fluida yaitu fase gas dan liquid dengan 2 jenis fluida (gas dan liquid). Simulasi akan mengacu pada kondisi steady state dan tidak ada solid content. Asumsi inlet fluid pada kondisi 5% turbulence, komposisi gas dan fraksi volume gas & liquid ialah konstan. Drag coefficient yang diguankan ialah 0.44 dengan working pressure 207 psi.Hasil penelitian menunjukkan bahwa bahwa persebaran fraksi gas dari bagian inlet tersebar secara merata pada semua bagian. Akan tetapi, setelah weirplate, ketika melewati nozzle dan menuju outlet gas, gas cenderung bergerak ke atas. Sedangkan, fraksi liquid mengalir dibagian bawah tengah ke bawah setelah fraksi gas. Gas dan liquid velocity streamline menunjukkan pola pergerakan dari inlet kemudian menumbuk weirplate, melewati nozzle dan keluar melalui outlet gas. Optimasi pada sistem telah dilakukan dan hasil yang diperoleh menunjukkan nilai fraksi gas dan fraksi liquid sebesar 0.74 dan 0.17 dalam aliran yang keluar dari bagian outlet. Sedangkan, untuk mass flow pada outlet gas sebesar 8.8 kg/s dan mass flow pada drain sebesar 0.05 kg/s.

A computational fluid dynamic and experimental study of an ozone contactor

2002 ◽  
Vol 46 (9) ◽  
pp. 87-93 ◽  
Author(s):  
T. Huang ◽  
C.J. Brouckaert ◽  
M. Docrat ◽  
M. Pryor
Keyword(s):  
Experimental Study ◽  
Computational Fluid Dynamic ◽  
Fluid Dynamic ◽  
Gas Injection ◽  
Tracer Tests ◽  
Cfd Model ◽  
Reactor Inlet ◽  
Model Predictions ◽  
Set Up ◽  
Ozone Contactor

A computational fluid dynamic (CFD) model of an ozone contacting chamber in the Umgeni Water Wiggins Waterworks in Durban, South Africa, has been set up and verified by experimental tracer tests, as part of an investigation to optimise the control and disinfection efficiency of the contactor. The effect of gas injection was modelled by increasing the turbulent intensity at the reactor inlet. Experimental tracer responses which were used as partial verification of the model correspond very closely to model predictions.

Research on Windage Power Loss of Spur Gear Base on CFD

2012 ◽  
Vol 184-185 ◽  
pp. 450-455 ◽  
Author(s):  
Ning Zhao ◽  
Qing Jian Jia
Keyword(s):  
Computational Fluid Dynamic ◽  
Power Loss ◽  
Fluid Dynamic ◽  
Three Dimensional ◽  
Spur Gear ◽  
Cfd Model ◽  
Major Parameter ◽  
Proportional Relationship ◽  
Tooth Flank ◽  
Icem Cfd

The paper established three-dimensional Computational fluid dynamic (CFD) model of the oil-air mixture in the gearbox after meshing by ICEM CFD simulated the turbulence model by the CFD. The method of calculate the windage power loss (WPL) of the spur gear were put forward. In order to reduced the WPL, compared the results between the CFD model with different modulus、clearance of the shroud and radius of the modification of gear top. The modulus is major parameter to WPL; the gear with shroud have lower WPL , WPL of the tooth flank and clearance of the tooth flank shroud do not show the proportional relationship, the gear with smallest clearance of gear side have lowest WPL，the modification of gear top can reduce the eddy scale which can reduce the WPL.

Unsteady Loading of Rotor Blades by High Pressure Air Injection

2009 ◽  
Author(s):  
John N. Chi
Keyword(s):  
High Pressure ◽  
Computational Fluid Dynamic ◽  
Rotor Blade ◽  
Fluid Dynamic ◽  
Air Injection ◽  
Cfd Model ◽  
One Dimensional ◽  
Transonic Compressor ◽  
Aerodynamic Loading ◽  
Transonic Rotor

A gas turbine engine consists of three primary components: a compressor, a combustion chamber, and a turbine. The operating range, performance, and reliability of gas turbine engines are limited by aerodynamic instabilities that occur in the compressor at low mass flow rates. Two of such compressor instabilities are rotating stall and surge. The stabilization of compression systems by means of active control has been demonstrated on several research compressors using different actuators such as inlet guide vanes, bleed valves, and air injection to manipulate the compressor flow field. This paper presents experimental and model simulated results of the steady and unsteady behaviors of air injection in high speed axial flow compressors that can be used for feasibility studies and control algorithm development. A control oriented model of the unsteady response of the transonic compressor blade rows to steady air injection is presented. This behavior was modeled by one-dimensional flow in a diffusing passage subject to a time varying inlet flow condition in the rotor relative reference frame. The one-dimensional model was then used to provide simplified input boundary conditions for a computational fluid dynamic (CFD) model that predicted aerodynamic loading on a transonic rotor blade due to steady air injection. The aerodynamic loading on a transonic rotor blade due to steady air injection were then simulated from the computational fluid dynamic (CFD) model. The simulation results for an evenly circumferentially spaced discrete number of jet actuators show that the fluctuating loading due to jet injection are non-sinusoidal and periodic. Total pressure, total temperature, and absolute flow angle survey measurements that map out the effect of high pressure air injection on a transonic compressor rotor for different levels of steady injection and different orientations are also presented.

ANALISIS KECEPATAN AIR MASUK TERHADAP BUKAAN GUIDE VANE TURBIN CROSSFLOW SKALA PICO HYDRO DENGAN SIMULASI CFD

2021 ◽  
Vol 3 (3) ◽  
pp. 94-101
Author(s):  
Dimas Riadi ◽  
Remon Lapisa ◽  
Hendri Nurdin ◽  
Mulianti Mulianti
Keyword(s):  
Steady State ◽  
Computational Fluid Dynamic ◽  
Guide Vane ◽  
Fluid Dynamic ◽  
Cross Flow

Turbin Ossberger atau yang biasa dikenal dengan turbin Cross-flow adalah type turbin bertekanan yang kerap dipakai pada PLTA. Contohnya adalah pembangkit listrik tenaga pico hydro. Kenagarian Koto Hilalang di Kabupaten Solok Kecamatan Kubung, Sumatera Barat merupakan salah satu contoh lokasi dimana Pembangkit Listrik Tenaga pico hydro dapat digunakan sebagai sumber tenaga. Penelitian ini dilakukan untuk menganalisis akibat dari variasi guide vane pada turbin jenis cross-flow yang dimanfaatkan sebagai pembangkit listrik tenaga pico hydro dengan daya yang dihasilkan sebesar 31,85 Kw. Dengan adanya penelitian ini dapat menentukan kecepatan magnitude air terhadap variasi bukaan guide vane untuk meningkatkan efisiensi turbin. Metode dalam pelaksanaan penelitian ini yaitu simulasi Computational Fluid Dynamic (CFD) dilakukan pada perangkat lunak Autodesk CFD dengan model turbulens k-ipsilon. Tahapan dalam melaksanakan simulasi CFD ini yakni dengan memvariasikan bukaan guide vane dengan variasi 25%, 50%, 75%, 100%. Hasil analisis pada simulasi CFD menunjukan bahwa kecepatan maksimal berada pada bukaan 25% yang menghasilkan kecepatan masuk sebesar 112,79 m/s pada parametric distance 32, simulasi ini menunjukan kecepatan masuk air mengalami penurunan. Kecepatan masuk air pada simulasi ini di buat tetap dengan sebesar 11,72 m/s dan dalam keadaan steady state.

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