Research the Internal Flow Field of Valve Stem Leakage

2013 ◽  
Vol 397-400 ◽  
pp. 257-260 ◽  
Author(s):  
Yan Tao An ◽  
Ru Jian Ma ◽  
Yong Wang
Keyword(s):  
Flow Field ◽  
Channel Model ◽  
Flow Direction ◽  
Internal Flow ◽  
Cavity Flow ◽  
Noise Sources ◽  
Valve Body ◽  
Valve Stem ◽  
Outlet Flow ◽  
Surrounding Areas

Establish valve stem leakage flow channel model, apply the CFD numerical simulation the internal flow field and noise. Research shows that it is no effect on the valve inlet and outlet flow field when the valve stem leakage. It is no effect on the valve body flow field and the greatest influence the balance cavity flow field. Changing the flow direction of the balance cavity and produce left vortex, it break left vortex of right part. New tremendous noise sources appear the balance cavity and improve the noise of surrounding areas.

Simulation and Analysis the Internal Flow Field of Control Valve Bonnet Leakage

2013 ◽  
Vol 423-426 ◽  
pp. 2078-2081 ◽  
Author(s):  
Yan Tao An ◽  
Ru Jian Ma ◽  
Yong Wang
Keyword(s):  
Numerical Simulation ◽  
Flow Field ◽  
Flow Direction ◽  
Control Valve ◽  
Internal Flow ◽  
Surrounding Area ◽  
Valve Body ◽  
Outlet Flow ◽  
Cfd Numerical Simulation

Apply the CFD numerical simulation the internal flow field and noise when the control valve is bonnet leakage and trouble-free. Research shows that bonnet leaking has almost no effect on valve inlet and outlet flow field. It is an impact on valve body flow field and the greatest impact on balance cavity. It changes the flow direction of the balance cavity and produces right vortex, in balance cavity where originally without noise, the tremendous noise appeares and improves the noise of the surrounding area.

Numerical Analysis of Flow Field Characteristics in Three-Z-Shaped Ultrasonic Flowmeter

2012 ◽  
Vol 226-228 ◽  
pp. 1829-1834 ◽  
Author(s):  
Jing Yuan Tang ◽  
Jian Ming Chen ◽  
Hong Bin Ma ◽  
Guang Yu Tang
Keyword(s):  
Flow Field ◽  
Cross Sections ◽  
Flow Direction ◽  
Fluid Velocity ◽  
Internal Flow ◽  
Reynolds Stress Model ◽  
Ultrasonic Flowmeter ◽  
Developed Turbulence ◽  
Fluid Field ◽  
Flow Field Characteristics

The flow field characteristics in U-typed bend has been extensively studied for transit time ultrasonic flowmeters designing, but for the flowmeter with three-Z-shaped round pipe there is still lack of corresponding research. This paper presents a computational fluid dynamics (CFD) approach for modeling of the three-Z-shaped ultrasonic flowmeter and studying of internal fluid field characteristics based on Reynolds stress model (RSM). The fluid velocity profile in the three ultrasound path is obtained using CFD and secondary flow in cross section also is analyzed. The simulation results show that the internal flow fields in the flowmeter are not fully developed turbulence with asymmetric axial velocity distribution and dramatic changes along the flow direction, and there are obvious secondary cross flows on theirs cross-sections. The CFD simulations provide useful insights into the flow field associated with ultrasonic flowmeters design.

Characteristic Analysis for the Internal Flow Field of CVT Torque Converter Based on FLUENT

2013 ◽  
Vol 427-429 ◽  
pp. 29-32
Author(s):  
Jin Gang Liu ◽  
Le Xiong ◽  
Yuan Qiang Tan
Keyword(s):  
Flow Field ◽  
Velocity Distribution ◽  
Channel Model ◽  
Internal Flow ◽  
Torque Converter ◽  
Characteristic Analysis ◽  
Design And Optimization ◽  
Distribution Of Flow

According to the issue of CVT torque converter internal flow field such as the complexity and not easy to calculate, the channel model of torque converter is established by UG, the grid of channel model is generated by GAMBIT, the internal flow field of torque converter is simulated based on FLUENT while the pressure and velocity distribution of flow field are calculated under three different conditions. The results show that analyzing the flow field of torque converter by FLUENT has certain guiding significance for the design and optimization of torque converter.

scholarly journals Experimental study on fiber suspensions in a curved expansion duct with particle image velocimetry

2012 ◽  
Vol 16 (5) ◽  
pp. 1414-1418 ◽  
Author(s):  
Xiao-Yu Liang ◽  
Huan-Huan Wu ◽  
Cheng-Xu Tu ◽  
Kai Zhang
Keyword(s):  
Particle Image Velocimetry ◽  
Flow Field ◽  
Flow Rate ◽  
Particle Image ◽  
Flow Direction ◽  
Internal Flow ◽  
Concave Wall ◽  
Image Velocimetry ◽  
Inlet Flow Rate ◽  
Convex Wall

The visualization measurement of internal flow field in a curved expansion duct is experimentally studied using particle image velocimetry technology and the influence of flow rate on flow field is analyzed. The streamline distribution and related performance curve in the internal flow field can be figured out through further analysis of experiment data. The results show that fiber orientation is mainly affected by velocity gradient, the fibers near the wall are aligned with the flow direction more quickly than the fibers in intermediate region, and the fibers near the concave wall are more quickly aligned with the flow direction than the convex wall. The larger inlet flow rate which will accordingly lead to increase inlet velocity enables the more quick adaptation and steady of fibers in flow direction.

Performance improvement of a high-speed aero-fuel centrifugal pump through active inlet injector

2020 ◽  
pp. 095441002096096
Author(s):  
Jia Li ◽  
Xin Wang ◽  
Wancheng Wang ◽  
Yue Wang
Keyword(s):  
Flow Field ◽  
Centrifugal Pump ◽  
Turbulence Model ◽  
High Speed ◽  
Flow Direction ◽  
Active Flow Control ◽  
Turbulence Models ◽  
Internal Flow ◽  
Geometrical Parameters ◽  
Centrifugal Pumps

This paper presents a high-speed aero-fuel centrifugal pump with an active inlet injector for an aero-engine aiming at regulating the internal flow field and improving overall hydraulic performance. Unlike most of the existing centrifugal pumps for aero-engines, an injector is designed and integrated with the pump to accomplish the active flow control. Firstly, by employing the energy equation in the pump, reasonable geometrical parameters of the injector are calculated. Then, a validation study is conducted with three known turbulence models, showing that simulations with the RNG κ- ε turbulence model can accurately predict the head and efficiency of the experimental pump. Finally, simulation results with the determined turbulence model are discussed. The results show that the static pressure is uniformly distributed inside the impeller, the volute and the injector. The flow field is significantly ameliorated by improving the pressure inside the suction pipe and controlling the flow direction via the injector. Furthermore, the head and efficiency of the designed pump with an active inlet injector are improved compared to the one without an injector.

scholarly journals Numerical study on the flow characteristics of centrifugal compressor impeller with crack damage

2021 ◽  
Vol 13 (7) ◽  
pp. 168781402110346
Author(s):  
Zhaoyu Liang ◽  
Longhao Xiang ◽  
Xuesong Wei ◽  
Songying Chen ◽  
Jingting Liu ◽  
...  
Keyword(s):  
Flow Field ◽  
Entropy Production ◽  
Numerical Study ◽  
Flow Direction ◽  
Flow Characteristics ◽  
Internal Flow ◽  
Maximum Pressure ◽  
Corrosion Propagation ◽  
Maximum Value ◽  
Compressor Impeller

The distribution and characteristics of internal flow field of the impeller with crack damage in service environment was investigated via numerical simulation with RNG k-ε turbulence model. The diffuser and volute are added based on the original impeller to simulate the internal flow field comprehensively. It was found that along the flow direction, the pressure, velocity, and temperature of the fluid increase continuously, and the maximum value appears near the outlet of the impeller. The maximum pressure and velocity in the crack area are distributed around the middle section and the trailing edge of the crack. Entropy production theory was applied in the study of internal flow, which reveals that the entropy production becomes larger around the crack. The further propagation of the crack is promoted by the opening force perpendicular to the entrance direction of the middle crack, the corrosion propagation at the rear edge of the crack, and the thermal deformation of the blade. The accelerated crack process will finally lead to the blade fracture accident.

Numerical Simulation and Improved Design of Inner Flow Field on Single Function Shower

2012 ◽  
Vol 246-247 ◽  
pp. 423-427
Author(s):  
Jing Huang ◽  
Jun Zhang ◽  
Hong Zhou He ◽  
Ming Fang Lu ◽  
Xiao Liu
Keyword(s):  
Numerical Simulation ◽  
Flow Field ◽  
Flow Characteristics ◽  
Internal Flow ◽  
Flow Speed ◽  
Single Function ◽  
Working Medium ◽  
Water Region ◽  
Outlet Flow ◽  
Improved Design

To reveal the variation of the inner flow field on a single function shower, numerical simulation was conducted for single-phase flow using water as the working medium. The standard k-ε turbulence model is employed to simulate inner flow characteristics. To improve the uniformity of outlet flow, according to the simulation results of the old shower, the mold structural have been modified. The results show that, the outlet shape and different size will affect the internal flow field. According to the old shower analysis of the flow, speed of the outlet fluctuations are more obvious, while the improved shower flow rate of the outlet distribution is more uniform and old shower exists of vortex in the two shares of water region, but improved shower vortex is smaller and the distribution of flow is also better than the former.

scholarly journals Internal Flow of a High Specific-Speed Diagonal-Flow Fan (Rotor Outlet Flow Fields with Rotating Stall)

2003 ◽  
Vol 9 (5) ◽  
pp. 337-344 ◽  
Author(s):  
Norimasa Shiomi ◽  
Wen-Xin Cai ◽  
Akio Muraoka ◽  
Kenji Kaneko ◽  
Toshiaki Setoguchi
Keyword(s):  
Flow Field ◽  
Three Dimensional ◽  
Internal Flow ◽  
Flow Fields ◽  
Rotating Stall ◽  
Rotor Blades ◽  
Rotor Speed ◽  
Double Phase ◽  
Outlet Flow ◽  
Specific Speed

We carried out investigations for the purpose of clarifying the rotor outlet flow fields with rotating stall cell in a diagonal-flow fan. The test fan was a high–specific-speed (ns=1620) type of diagonal-flow fan that had 6 rotor blades and 11 stator blades. It has been shown that the number of the stall cell is 1, and its propagating speed is approximately 80% of its rotor speed, although little has been known about the behavior of the stall cell because a flow field with a rotating stall cell is essentially unsteady. In order to capture the behavior of the stall cell at the rotor outlet flow fields, hot-wire surveys were performed using a single-slant hotwire probe. The data obtained by these surveys were processed by means of a double phase-locked averaging technique, which enabled us to capture the flow field with the rotating stall cell in the reference coordinate system fixed to the rotor. As a result, time-dependent ensemble averages of the three-dimensional velocity components at the rotor outlet flow fields were obtained. The behavior of the stall cell was shown for each velocity component, and the flow patterns on the meridional planes were illustrated.

Numerical Study on Mechanical Characteristics of Steam Turbine Valve Disc

2013 ◽  
Vol 572 ◽  
pp. 319-322
Author(s):  
Dong Yue Qu ◽  
Zhong Yuan Guo ◽  
Chong Liu
Keyword(s):  
Flow Field ◽  
Axial Force ◽  
Numerical Study ◽  
Pressure Ratio ◽  
Flow Characteristics ◽  
Control Valve ◽  
Internal Flow ◽  
Simulation Method ◽  
Complex Flow ◽  
Valve Stem

The instability flow in the control valve often lead to abnormal vibration, the valve wear and the valve stem destruction, also lead to pressure loss. The flow in the control valve show complex flow regime distribution and variation, it is a typical unsteady flow. Therefore, it is necessary to theoretical calculation and qualitative analyses the flow field of valve by the numerical simulation method. In this paper, we study on the axial force of valve stem that caused by the fluid pulsation pressure. Establishing the flow field model of the control valve, generating the computational grid through the pre-processor, using the CFD software to do discretized and solved, getting visualization graphics of the internal flow field. Study the changes of the flow characteristics according to different pressure ratio, getting the variation characteristic of axial force. Provide the basis for subsequent optimization and design of the low vibration control valve.

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