Numerical Simulation of the Unsteady Flow Patterns in a Small Squirrel-Cage Fan

2006 ◽  
Author(s):  
Sandra Velarde-Sua´rez ◽  
Rafael Ballesteros-Tajadura ◽  
Jose´ Gonza´lez-Pe´rez ◽  
Bruno Pereiras-Garci´a
Keyword(s):  
Numerical Simulation ◽  
Air Conditioning ◽  
Flow Distribution ◽  
Geometrical Model ◽  
Squirrel Cage ◽  
Automotive Air Conditioning ◽  
Commercial Code ◽  
Performance Curves ◽  
Flow Features ◽  
Good Agreement

In this work, a numerical simulation on the main flow features in a squirrel-cage fan, used in automotive air conditioning units, has been carried out. A 3D unsteady model has been developed for the entire machine. The flow in this geometrical model has been solved using the commercial code FLUENT®. Some of the analyzed features are the performance curves, the flow distribution over the different aspiration sections, the pressure and velocity distributions in selected surfaces, and the forces on the blades and on the whole impeller. The numerical results have been compared with the available experimental data, showing a reasonable good agreement.

Numerical Simulation and Experimental Study of a Two-Floor Structure Pumping System

2010 ◽  
Author(s):  
Chao Liu ◽  
Yan Jin ◽  
Jiren Zhou ◽  
Fangping Tang
Keyword(s):  
Numerical Simulation ◽  
Simple Structure ◽  
High Efficiency ◽  
Test Results ◽  
Pumping System ◽  
Performance Curves ◽  
The Standard Model ◽  
Floor Structure ◽  
Low Efficiency ◽  
Good Agreement

The two-floor flow passages pumping system with the simple structure is well practical in the Basin of Yangzi River downstream. However, this kind of pumping system has some disadvantages, such as low efficiency, easy to appear submerse vortex in discharge flow passages which causes the unit vibration and does harm to the operating of pump unit. In order to solve these problems, the design scheme with a new curve of diffusing outlet structure and inlet cone put forward, which are used in the renovation of the two-floor flow passages pumping station. With the numerical simulation of the two-floor flow passages pumping system, the flow fields are analyzed, and the external performance curves are obtained. To verify the calculation, a model tests were done using the standard model of pump. The test results are compared with the performance curves of numerical simulation. Good agreement of two results is found in the high efficiency area, which can show the calculation is believable. The new design improves the efficiency of pumping system significantly and eliminates the submerse vortex, also can guarantees the economy and security of operating.

Numerical Simulation of Heat Flow in a Vehicle Cabin Using the Personal Air Conditioning System

2013 ◽  
Vol 694-697 ◽  
pp. 755-761
Author(s):  
Yang Zeng ◽  
Masafumi Katsuta ◽  
Tomohiro Anamizu
Keyword(s):  
Numerical Simulation ◽  
Heat Flow ◽  
Electric Power ◽  
Air Conditioning ◽  
Battery Electric Vehicle ◽  
Cfd Analysis ◽  
Air Conditioning System ◽  
Vehicle Cabin ◽  
Thermal Distribution ◽  
Good Agreement

The personal air conditioning system is used in the battery electric vehicle instead of the traditional one and the experiment validated that this system can make passengers feel comfort after four minutes. All the system can only consume electric power 338.8 W, which is less than the traditional air conditioning of cabin. A simplified 3-D N box vehicle cabin model was created to simulate the thermal distribution under this system by using the CFD analysis and the results of calculation have good agreement with the experiment recording.

Numerical Simulation of Immersion Quench Cooling Process: Part II

2008 ◽  
Author(s):  
Vedanth Srinivasan ◽  
Kil-min Moon ◽  
David Greif ◽  
DeMing Wang ◽  
Myung-hwan Kim
Keyword(s):  
Numerical Simulation ◽  
Computational Grids ◽  
Temperature Pattern ◽  
Cooling Process ◽  
Application Process ◽  
Commercial Code ◽  
Flow Features ◽  
Solid Region ◽  
Field Information ◽  
Quench Cooling

In this article, we present the numerical simulation of a real cylinder head quenching cooling process using a newly developed approach for immersion quenching described in Part I of this research. Computational grids, consisting of 1.6 million cells in the coolant (liquid) domain and 1.5 million cells in the solid region, are utilized to perform the ACCI coupled quenching simulation implemented in the commercial code AVL-FIRE framework. Multitude of flow features such as vapor pocket generation, bubble clustering and their disposition are captured very effectively during the computation. Comprehensive descriptions of the flow field information and the temperature pattern in the solid at different time instants are provided. A comparison of the registered temperature readings at different monitoring locations with the numerical results generates an overall very good agreement. Our results indicate the presence of intense non-uniformity in the temperature distribution within the solid region which is of grave importance in evaluating the stress and fatigue patterns generated in the quenched object. The capability of the quenching model in simulating a real-time immersion quenching application process and the efficiency in reducing the overall model size by the application of the ACCI procedure is well demonstrated.

A Comparison of the Numerical Simulation and Experimental Investigation of the Flow Around a High Speed Train

2002 ◽  
Author(s):  
N. Paradot ◽  
C. Talotte ◽  
H. Garem ◽  
J. Delville ◽  
J.-P. Bonnet
Keyword(s):  
Numerical Simulation ◽  
Experimental Investigation ◽  
Kinetic Energy ◽  
High Speed ◽  
Streamwise Velocity ◽  
High Speed Train ◽  
Wind Tunnel Experiments ◽  
Commercial Code ◽  
Basic Blocks ◽  
Good Agreement

Numerical simulations of the turbulent flow surrounding a high speed train are carried out at SNCF (French Railways) using the commercial code Star CD. The numerical methodology developed consists in building the complete detailed topology of a train with basic blocks. The validation of the method is done through a comparison with wind tunnel experiments. A globally good agreement is found concerning the drag estimation of a short trainset. Predictions of mean streamwise velocity and turbulent kinetic energy show the quite satisfactory capabilities of the methodology.

Numerical Simulation for the Spray Field in Absorption Refrigerator for Automotive Air-Conditioning

2014 ◽  
Vol 532 ◽  
pp. 475-478
Author(s):  
Hai Jun Qiao ◽  
Jia Nan Wu
Keyword(s):  
Numerical Simulation ◽  
Flow Field ◽  
Air Conditioning ◽  
Cfd Simulation ◽  
Simulation Technology ◽  
Automotive Air Conditioning ◽  
Cold Source ◽  
Spray Field ◽  
Narrow Space ◽  
Absorption Refrigerator

Absorption cold source in the vehicles differs from ordinary absorption cold source especially in its narrow space and relatively compact arrangement. In this study, CFD simulation technology, simulation and analysis of spray flow field in an absorber of automotive absorption refrigerator is carried out to verify the effectiveness of packings. This could lay a foundation for making further improvement on performance of car's absorption cold source

Numerical Model for the Unsteady Flow Features of a Squirrel Cage Fan

2009 ◽  
Author(s):  
Rafael Ballesteros-Tajadura ◽  
Francisco Israel Guerras Colo´n ◽  
Sandra Velarde-Sua´rez ◽  
Jesu´s Manuel Ferna´ndez Oro ◽  
Katia Mari´a Argu¨elles Di´az ◽  
...  
Keyword(s):  
Flow Field ◽  
Unsteady Flow ◽  
Flow Rate ◽  
Flow Distribution ◽  
Experimental Tests ◽  
Centrifugal Fan ◽  
Flow Rates ◽  
Squirrel Cage ◽  
Flow Features ◽  
Separation Zones

This paper shows a numerical research on the unsteady flow field inside a squirrel cage fan. The studied features are both the instantaneous flow fields and the average fluid flow associated to the blade passage frequency. The squirrel cage fan studied is a small centrifugal fan with a twin impeller configuration, each with 23 forward curved blades. The blades chord is 0.013 m and each impeller has a diameter of 0.08 m and a width of 0.094 m. The impellers operate inside an external spiral casing with a rectangular exit, followed by the outlet duct. A first series of experimental tests were performed in order to characterize the unit. The performance curves (head, power and efficiency versus flow rate) were measured. These tests show a nominal flow rate at around 0.098 m3/s and a specific speed ωs = 1.9. From there on, three different flow rates were considered to study different flow behaviours in the impeller. In parallel with the mentioned experimental study, the unsteady 3D flow field inside the fan equipped with the same impeller was modelled for the referred flow rates, by means of the commercial CFD code FLUENT. To facilitate the modification of any geometrical feature, the mesh of the modelled fan was divided in several regions: inlet duct, impeller, volute and diffuser with outlet duct. The main goal of the paper is to show the numerical results obtained on the absolute and relative frames. Three main flow features will be analysed: the inlet flow distribution, the blade to blade field and the impeller exit flow. At the fan inlet, special care will be taken to detect possible recirculation or separation zones. On the other hand, and for each studied flow rate, the distribution of outlet flow field is also analysed. Conclusions on flow uniformity are drawn.

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