In 16V265H Locomotive Diesel Engine Nozzle Flow Field Simulation Analysis

2014 ◽  
Vol 983 ◽  
pp. 368-373
Author(s):  
Shi He Li ◽  
Ming Hai Li ◽  
Xiao Du
Keyword(s):  
Flow Field ◽  
Fuel Injection ◽  
Simulation Analysis ◽  
Flow Characteristics ◽  
Experimental Conditions ◽  
Nozzle Pressure ◽  
Fluent Software ◽  
Level Of Selection ◽  
Distribution Of Flow ◽  
Locomotive Diesel

The investigation of the flow characteristics inside the nozzle becomes more and more important because the flow status in the nozzle and fuel injection significantly influence the emission and economy of diesel engines. Due to limited experimental conditions, we can make use of computer simulation, UG models can be used to predict the flow pattern inside the injectors and promote the level of selection and design of injectors. In this investigation, the UG model is calculated by FLUENT software after considering the compressibility and the viscosity of the fuel. By studying, we can predict the distribution of flow field inside the nozzle, analysis the rationality of the design of nozzle, determine the appropriate boundary conditions, mainly includes the nozzle pressure chamber and the needle tip structure, points out that the improvement direction.

Research on the Periodicity of Flow Field in a Compressor Sector Cascade

2020 ◽  
Author(s):  
Wenfeng Xu ◽  
Peng Sun ◽  
Guogang Yang
Keyword(s):  
Flow Field ◽  
Design Method ◽  
Flow Characteristics ◽  
Suction Side ◽  
Low Energy ◽  
Experimental Conditions ◽  
Flow Passage ◽  
Aerodynamic Parameters ◽  
Real Flow ◽  
Annular Cascade

Abstract Sector cascade experiments can not only be convenient to measure various aerodynamic parameters but also reveal the real flow characteristics in turbomachinery. However, the sector cascade is only a part of the whole annular cascade. The circumferential angle, the structure of the side guide plate (SGP) and the suction mode on the SGP have a great effect on the periodicity of the flow field. Therefore, the effect of structure on periodicity must be taken into consideration in order to obtain accurate data of the sector cascade experiment. In this paper, a compressor sector cascade composed of a row of adjustable guide vanes (AGVs) and a row of stators is designed. The effect of the circumferential angle, SGP structure and suction position on the periodicity is studied by numerical simulation. An optimal cascade scheme is selected for experimental research. The results show that a larger circumferential angle can weaken the effect of low-energy fluid near the SGP on the middle passages. However, given the limited experimental conditions, the circumferential angle is set at 110° which consists of 15 AGVs and 14 stators. What’s more, the SGP with the same bowed angle of AGV on both sides of the cascade can reduce the influence of the SGP on the adjacent passages and obtain a regular periodicity. The low-energy fluids still accumulate near the SGP. The suction near the stator suction side of the SGP can alleviate the blockage in the flow passage and further improve the periodicity of the cascade. Serious analysis of the experiment results have further identified that the suction near the stator suction side of SGP can make the aerodynamic parameters of the flow field uniform and lead to a good periodicity. At the same time, the feasibility of this design method is verified.

scholarly journals Simulation and experimental research based on carrier gas flow rate on the influence of four-channel coaxial nozzle flow field

2020 ◽  
pp. 002029402096423
Author(s):  
Shi Rui Guo ◽  
Qian Qian Yin ◽  
Lu Jun Cui ◽  
Xiao Lei Li ◽  
Ying Hao Cui ◽  
...  
Keyword(s):  
Flow Field ◽  
Gas Flow ◽  
Simulation Analysis ◽  
Two Phase ◽  
Carrier Gas ◽  
Coaxial Nozzle ◽  
Convergence Point ◽  
Flow Convergence ◽  
Fluent Software ◽  
Carrier Gas Flow

This paper investigates the influence of carrier gas flow on the external flow field of coaxial powder feeding nozzle. FLUENT software was adopted to establish gas-solid two-phase flow. The simulation of powder stream field under different carrier gas flow was also carried out. Results show that the larger the flow of carrier gas is, the higher the gas flow field velocity at the nozzle outlet is. At the same time, the concentration at the convergence point is lower, and the convergent point is maintained at 0.015 m. Under the condition of 4 L/min, the powder flow convergence is good. When it exceeds 4 L/min, powder spot diameter increases. The experiment of powder aggregation and laser cladding forming were completed, which shows that the forming effect is the best one under the condition of 4 L/min. It is consistent with the simulation analysis results and has a high reference to the optimization of the process parameters of coaxial nozzle.

Flow Field Analysis and Structure Optimization of Water Hydraulic Poppet Valve Based on the CFD

2013 ◽  
Vol 791-793 ◽  
pp. 734-737 ◽  
Author(s):  
Qiu Xia ◽  
Xiang Pan Guang
Keyword(s):  
Flow Field ◽  
Simulation Analysis ◽  
Internal Flow ◽  
Turbulent Energy ◽  
Field Analysis ◽  
Value Differences ◽  
Poppet Valve ◽  
Traditional Structure ◽  
Fluent Software ◽  
Water Hydraulic

This paper builds two water hydraulic poppet valve models which are of different structure, and simulation analysis used by FLUENT software on it’s internal flow field. The analysis results show that, after improving the structure of water hydraulic poppet valve, import and export pressure value differences decreased, effectively restrains the generation of cavitation, reduces the vibration amplitude and turn down noise, reduces loss of turbulent energy, the overall performance is superior to the traditional structure.

Simulation Analysis of Temperature Field of Permanent Magnet Governor

2014 ◽  
Vol 1044-1045 ◽  
pp. 422-425 ◽  
Author(s):  
Yan Jie Wang ◽  
San Ping Zhou
Keyword(s):  
Fluid Dynamics ◽  
Temperature Field ◽  
Flow Field ◽  
Permanent Magnet ◽  
Simulation Analysis ◽  
Eddy Current Loss ◽  
Ansys Fluent ◽  
Operation Process ◽  
Fluent Software ◽  
Computational Fluid Dynamics Cfd

In the operation process of permanent magnet governor, the temperature rises due to eddy current loss, and demagnetization of permanent magnet occurs at high temperature. The numerical simulation of fluid flow field and temperature field was carried out with the method of computational fluid dynamics (CFD) and ANSYS-Fluent software. And then we improved the structure of permanent magnet governor on the basis of analysis of the flow field and temperature distribution. The result indicates that the flow of improved structure increases, and temperature drops 46.°C, fulfilling the desired temperature range of permanent magnet can bear, which provides a theory basis for the design of ventilation-cooling structure of permanent magnet governor.

scholarly journals Steady-State Flow Characteristics and End Clearance Optimization of Internal Gear Grease Pump

2021 ◽  
Vol 2021 ◽  
pp. 1-16
Author(s):  
Xinjian Li ◽  
Lingfeng Tang ◽  
Ming Qian
Keyword(s):  
Flow Field ◽  
Field Model ◽  
Flow Characteristics ◽  
High Viscosity ◽  
Effect Of Temperature ◽  
Working Pressure ◽  
Side Plate ◽  
Clearance Flow ◽  
Fluent Software ◽  
Internal Gear

The internal gear grease pump is a mechanical device used for transfer of high viscosity fluid. The existing clearance between the end faces of the internal or external gear and the floating side plate might cause pump leakage during operation. In order to obtain the optimal end clearance of the internal gear grease pump, the rheological features of the lubricating lithium-based grease for various temperatures are explored via rotating rheometer. Shear force and apparent viscosity are chosen as monitored experimental parameters. The experimental data is fitted to obtain grease rheological features at various temperatures. The end clearance flow field model and the leakage model are established. Fluent software is employed for solving the flow field model and exploring the effect of temperature, end clearance, and speed on grease leakage. Superior grease flow performance is observed with an increase in temperature, which makes it to easier for the grease to leak from the end clearance. With an increase in the end clearance and the working pressure of the pump, an increase in leakage is also observed. Furthermore, it is found that rotational speed also affects the pump leakage. The leakage mechanism is obtained by combining the rheological features of the grease at the end clearance. The mathematical model method is utilized to solve for the optimal value of the end clearance.

Flow Field Numerical Simulation Analysis of Five Wing Horizontal Wave Turbine Power Plant with Different Blade Angles

2013 ◽  
Vol 477-478 ◽  
pp. 221-225
Author(s):  
Shi Ming Wang ◽  
Ka Tian
Keyword(s):  
Flow Field ◽  
Simulation Analysis ◽  
Turbine Blades ◽  
Maximum Velocity ◽  
Flow Distribution ◽  
High Flow ◽  
Rotational Period ◽  
Blade Angle ◽  
Horizontal Wave ◽  
Fluent Software

Used FLUENT software to simulate the flow distribution of a certain horizontal turbine with its blade angle changed from 25 ° to-35 °.The simulation results show the flow field changes with a period which was a fifth to the turbine rotational period. When the blade heads deflected laterally, the high flow velocity appeared near rear back turbine blades, or it appeared near the facing flow blades which were in the front lower part of the turbine. Besides, for blade angle deflected inside models, a stable annular velocity vector vortex gradually emerged around turbine as blade angle increased. The maximum velocity of flow field increased firstly and then stayed stable as blade angle changed. The flow distribution results fully confirmed that the reasonable optimization to the blade angle of the turbine can help the turbine achieve a more effective rotation and improve the flow distribution.

Experimental and Computational Studies on Flow Characteristics of Single Expansion Nozzle

2021 ◽  
Author(s):  
Dakshina Murthy Inturi ◽  
Lovaraju Pinnam ◽  
Ramachandra Raju Vegesna
Keyword(s):  
Mach Number ◽  
Flow Field ◽  
Pressure Ratio ◽  
Flow Characteristics ◽  
Oblique Shock ◽  
Solid Boundary ◽  
Computational Studies ◽  
Nozzle Pressure Ratio ◽  
Nozzle Pressure ◽  
Flow Field Characteristics

Abstract The present investigation aims to study the flow field characteristics of a single expansion nozzle (SEN). The flow field characteristics of conventional convergent-divergent (C-D) nozzle are also investigated for comparison. The experimental and computational studies were carried out for nozzle pressure ratios of 1.45, 1.55, 1.75, 2, 3, 4 and 5. The studies reveal that, for the single expansion nozzle the oblique shock moves towards the solid boundary with the increase of nozzle pressure ratio, which makes the flow to accelerate continuously in the majority of the divergent portion. The single expansion nozzle delivers the flow with higher Mach number than the C-D nozzle at the exit of the nozzle.

Experiment and Optimization of Settling Effect of Drip Streaming Filter

2014 ◽  
Vol 620 ◽  
pp. 246-253
Author(s):  
Su Zhen Wu ◽  
Han Song Yang
Keyword(s):  
Flow Field ◽  
Flow Rate ◽  
Simulation Analysis ◽  
Structural Parameters ◽  
Internal Flow ◽  
Tube Insertion ◽  
Insertion Depth ◽  
Sediment Production ◽  
Fluent Software ◽  
The Relationship

In this thesis, by changing the filter overflow tube insertion depth of spin streaming filter, combined with the existing drip irrigation equipment change the structure parameters of spin streaming filter. Using Fluent software to choose reasonable turbulence model for numerical simulation analysis, contrastive research on the field test was carried on, reveals the relationship between the internal flow field pressure and the flow rate. The sediment production increased before they are reduced with the increase of the overflow tube insertion depth. It should choose the optimal insertion depth according to the specific use and usage model of hydrocyclone in actually use. The variation trend of internal flow field pressure and the flow rate when selected structural parameters changed are also analyzed. With the increase of insertion depth, the axial velocity and radial velocity of sand and water inside the hydrocyclone shows the tendency of decrease. Furthermore, the field experiment verifies the simulation result, thus proving the feasibility of using Fluent computational fluid dynamics software to simulate the internal flow field of the spin streaming filter. The research results will provide referential basis for the design and application of the drip filter system.

Study on the Flow Field of Air Floating Pool of Pressurized Dissolved-Air Floatation Water Treatment System

2013 ◽  
Vol 706-708 ◽  
pp. 565-570
Author(s):  
Yan Min Li ◽  
Pei Yan Wang ◽  
Kun Li
Keyword(s):  
Water Treatment ◽  
Flow Field ◽  
Simulation Analysis ◽  
Reference Value ◽  
Structure Design ◽  
Treatment System ◽  
Water Treatment System ◽  
Research Results ◽  
Fluent Software ◽  
Dissolved Air

This paper used the FLUENT software to analyze a flow field of the advection type air-float pool, the simulation analysis is applied to study of partition plates, water retaining plate and floatation pool length depth ratio and other key parameters which influence the flotation pool flotation effect .The research results provide the basis for the structure design of improving the flotation pool. It has a certain reference value for the same type of flotation pool design.

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