scholarly journals Investigation on design method of curved compression surface of inlet on scramjet

2022 ◽  
Vol 355 ◽  
pp. 01001
Author(s):  
Pan Jin ◽  
Jin Feng
Keyword(s):  
Numerical Simulation ◽  
Calculation Method ◽  
Design Method ◽  
Flow Direction ◽  
Simulation Method ◽  
Curved Surfaces ◽  
Compression Efficiency ◽  
Gradient Distribution ◽  
System Pressure ◽  
Fluent Software

Suppose that curved compression surface of inlet consists of segments. Two curved surfaces formed by equal compression angles of the micro-element segments and a slight increase in the compression angle of the micro-element segments are designed respectively. The numerical simulation method is used to compare the performance of two curved surfaces with the reference three-wedge compression surface. Select NASA classic test data, in order to determine the turbulence model and calculation method chosen by the numerical simulation Fluent software. The results show: the configuration of the segment compression angle deeply affects compression efficiency of the curved surface compression system. Pressure gradient distribution on the compression surface with constant compression angles segments is nearly constant along the incoming flow direction, and the curved compression surface easily resist the separation of the boundary layer compared to three-wedges compression surface. The approximate calculation method of the bending shock profile is given.

scholarly journals Study of the Effect of Centrifugal Force on Rotor Blade Icing Process

2017 ◽  
Vol 2017 ◽  
pp. 1-9 ◽  
Author(s):  
Zhengzhi Wang ◽  
Chunling Zhu
Keyword(s):  
Numerical Simulation ◽  
Centrifugal Force ◽  
Rotor Blade ◽  
Flow Direction ◽  
Three Dimensional ◽  
Simulation Method ◽  
Two Phase ◽  
Numerical Simulation Method ◽  
Calculation Results ◽  
Flow Field Characteristics

In view of the rotor icing problems, the influence of centrifugal force on rotor blade icing is investigated. A numerical simulation method of three-dimensional rotor blade icing is presented. Body-fitted grids around the rotor blade are generated using overlapping grid technology and rotor flow field characteristics are obtained by solving N-S equations. According to Eulerian two-phase flow, the droplet trajectories are calculated and droplet impingement characteristics are obtained. The mass and energy conservation equations of ice accretion model are established and a new calculation method of runback water mass based on shear stress and centrifugal force is proposed to simulate water flow and ice shape. The calculation results are compared with available experimental results in order to verify the correctness of the numerical simulation method. The influence of centrifugal force on rotor icing is calculated. The results show that the flow direction and distribution of liquid water on rotor surfaces change under the action of centrifugal force, which lead to the increasing of icing at the stagnation point and the decreasing of icing on both frozen limitations.

Calculation and Design Method Study of the Coil-Wound Heat Exchanger

2014 ◽  
Vol 1008-1009 ◽  
pp. 850-860 ◽  
Author(s):  
Zhou Wei Zhang ◽  
Jia Xing Xue ◽  
Ya Hong Wang
Keyword(s):  
Heat Transfer ◽  
Numerical Simulation ◽  
Heat Exchanger ◽  
Design Method ◽  
Fluid Velocity ◽  
Exchange Process ◽  
Three Dimensional ◽  
Simulation Method ◽  
Physical Parameters ◽  
Numerical Result

A calculation method for counter-current type coil-wound heat exchanger is presented for heat exchange process. The numerical simulation method is applied to determine the basic physical parameters of wound bundles. By controlling the inlet fluid velocity varying in coil-wound heat exchanger to program and calculate the iterative process. The calculation data is analyzed by comparison of numerical result and the unit three dimensional pipe bundle model was built. Studies show that the introduction of numerical simulation can simplify the pipe winding process and accelerate the calculation and design of overall configuration in coil-wound heat exchanger. This method can be applied to the physical modeling and heat transfer calculation of pipe bundles in coil wound heat exchanger, program to calculate the complex heat transfer changing with velocity and other parameters, and optimize the overall design and calculation of spiral bundles.

Three-Dimensional Numerical Simulation of the Flow around Two Side-by-Side Cylinders of Different Diameters

2014 ◽  
Vol 721 ◽  
pp. 199-202
Author(s):  
Zhen Xiao Bi ◽  
Zhi Han Zhu
Keyword(s):  
Numerical Simulation ◽  
Flow Direction ◽  
Three Dimensional ◽  
Cross Flow ◽  
Simulation Method ◽  
Scale Model ◽  
Hydrodynamic Characteristics ◽  
Eddy Simulation ◽  
Drag And Lift ◽  
Different Diameters

This paper presents the calculation of hydrodynamic characteristics of two side-by-side cylinders of different diameters in three dimensional incompressible uniform cross flow by using Large-eddy simulation method based on dynamical Smagorinsky-Lilly sub-grid scale model. Solution of the three dimensional N-S equations were obtained by the finite volume method. The numerical simulation focused on investigating the characteristic of the pressure distribution (drag and lift force), vorticity field and turbulence Re=. Results shows that, the asymmetry of the time –averaged velocity distribution in the flow direction behind the two cylinders is very obvious; the frequency of eddy shedding of the small cylinder is about twice of the large one. The turbulence of cylinders is more obvious.

Cantalever Protection Aluminum Profiles Extrusion Die Design Method and Numerical Simulation

2012 ◽  
Vol 152-154 ◽  
pp. 301-305
Author(s):  
Jian Yi Pan ◽  
Yao Wang ◽  
Zhao Yao Zhou ◽  
Shou Bin Dong
Keyword(s):  
Numerical Simulation ◽  
Material Flow ◽  
Design Method ◽  
Simulation Method ◽  
Die Design ◽  
Design Scheme ◽  
Extrusion Dies ◽  
Cantilever Structure ◽  
Extrusion Die Design ◽  
Stress And Deformation

In order to improve the service life of extrusion dies with long cantilever structure, a design scheme of porthole die for half-hollow profiles with long cantilever was introduced. Using numerical simulation method, compared with conventional method for the half-hollow porthole design method of a typical profile die model, the equilibrium of the material flow at the outlet, the stress and deformation of the die were analyzed in detail. With selection of the cantilever thickness shrinkage as the objective function, experiment was done to verify the result of simulating analysis. The results indicated that there was only little difference for the equilibrium of material flow between the two design schemes, but the stress load and deformation of the design scheme were greatly improved.

Numerical Simulation of the Effect of Spoiler Ribs on the Flow Field in Household Soymilk Maker

2013 ◽  
Vol 483 ◽  
pp. 238-242
Author(s):  
Lian Hua Zhu ◽  
Qiang Song ◽  
Guo Ping Li ◽  
Xiang Bo Ze
Keyword(s):  
Numerical Simulation ◽  
Flow Field ◽  
Design Method ◽  
Orthogonal Experiment ◽  
Simulation Method ◽  
Orthogonal Experimental Design ◽  
Soy Milk ◽  
Structure Parameter ◽  
Experimental Design Method ◽  
Velocity Turbulence

The spoiler rib is a auxiliary structure of non mesh enclosure soy milk maker, it plays an important role in the process of crushing soybean. In this paper, we designed an orthogonal experiment according to different structure parameter of the spoiler ribs. By using the numerical simulation method, we can get the law of the flow field. We analysised the velocity, turbulence intensity distribution roles in the flow field of different rib's structure parameter, the model of power consumption. Finally, the optimal solutions were found by numerical orthogonal experimental design method in a several turn.

scholarly journals Development and Performance Analysis of Pneumatic Soft-Bodied Bionic Actuator

2021 ◽  
Vol 2021 ◽  
pp. 1-13
Author(s):  
Wenchuan Zhao ◽  
Yu Zhang ◽  
Ning Wang
Keyword(s):  
Numerical Simulation ◽  
Silica Gel ◽  
Dynamic Characteristics ◽  
Design Method ◽  
Structural Characteristics ◽  
Simulation Method ◽  
Structure Design ◽  
Deformation Analysis ◽  
Analysis Model ◽  
Nonlinear Hyperelasticity

The design of a pneumatic soft-bodied bionic actuator derives from the structural characteristics and motion mechanism of biological muscles, combined with the nonlinear hyperelasticity of silica gel, which can improve the mobility and environmental adaptability of soft-bodied bionic robots. Based on Yeoh’s second-order constitutive model of silica gel, the deformation analysis model of the actuator is established, and the rationality of the structure design and motion forms of the actuator and the accuracy of the deformation analysis model are verified by using the numerical simulation algorithm. According to the physical model of the pneumatic soft-bodied bionic actuator, the motion and dynamic characteristics of the actuator are tested and analyzed, the curves of motion and dynamic characteristics of the actuator are obtained, and the empirical formula of the bending angle and driving torque of the actuator is fitted out. The results show that the deformation analysis model and numerical simulation method are accurate, and the pneumatic soft-bodied bionic actuator is feasible and effective, which can provide a design method and reference basis for the research and implementation of soft-bodied bionic robot actuator.

Numerical Simulation of Cavity Flow within the Flow Field

2013 ◽  
Vol 712-715 ◽  
pp. 1259-1262
Author(s):  
Jian Yu Cai ◽  
He Juan Chen
Keyword(s):  
Numerical Simulation ◽  
Temperature Field ◽  
Flow Field ◽  
Centrifugal Pump ◽  
Calculation Method ◽  
Simulation Method ◽  
Cavity Flow ◽  
Mechanical Seal ◽  
Seal Ring ◽  
Temperature And Pressure

Analysis of numerical simulation was used on flow field and temperature field in mechanical seal cavity. It borrowed a new calculation method, which was more visual and simpler than before. And this method analysed the change in temperature field of mechanical seal ring and the distribution of temperature and pressure in the flow field when mechanical seal was working. The result showed that the numerical simulation method was effect to the flow field in centrifugal pump.

Numerical Simulation of Particle Impact Erosion within Electric Submersible Pump Based on Fluent

2014 ◽  
Vol 541-542 ◽  
pp. 713-715
Author(s):  
Si Jie Mei ◽  
Zun Ce Wang ◽  
Si Chen ◽  
Feng Xia Lu ◽  
Jin Gang He
Keyword(s):  
Numerical Simulation ◽  
Simulation Method ◽  
Solid Particles ◽  
Water Flooding ◽  
Erosion Wear ◽  
Submersible Pump ◽  
Submersible Electric Pump ◽  
Fluent Software ◽  
Electric Submersible Pump ◽  
Impact Erosion

In the same well water flooding process, solid particles contained in the fluid often result in the impeller submersible electric pump to erosion wear. We use Fluent software to establish the model of flow field,and use numerical simulation method to analyze the erosion wear. We use the erosion theory to calculate the erosion wear rate,and verify the correctness by the contrast between the results of numerical simulation and actual value.

Numerical Simulation Analysis of Cold Air Distribution System

2016 ◽  
Vol 858 ◽  
pp. 278-281
Author(s):  
Cheng Cai Sun ◽  
Bo Zhou ◽  
Jie Lv
Keyword(s):  
Numerical Simulation ◽  
Physical Model ◽  
Distribution System ◽  
Simulation Analysis ◽  
Three Dimensional ◽  
Simulation Method ◽  
Air Distribution ◽  
Indoor Airflow ◽  
Cold Air ◽  
Fluent Software

This paper based on an actual project as an example, researching the application of cold air distribution system by using the numerical simulation method. By using Fluent software to establish a three-dimensional physical model, simplificate the physical model, establish proper tuyere model, choose the appropriate turbulence model, select the appropriate boundary conditions. Then simulate indoor airflow organization, get the distribution of temperature field, velocity field in the working area, and evaluate the comfort in the working area. Though the research, this paper provides the appropriate air distribution which is the upper supply air and on opposite side bottom exhaust air. This paper though the numerical simulation concludes that adopts the appropriate air distribution could meet the requirements of indoor thermal comfort.

scholarly journals Study on the Design Method of Impeller on Low Specific Speed Centrifugal Pump

2015 ◽  
Vol 9 (1) ◽  
pp. 594-600
Author(s):  
Jianhua Liu ◽  
Xiangyang Zhao ◽  
Miaoxin Xiao
Keyword(s):  
Numerical Simulation ◽  
Centrifugal Pump ◽  
Design Method ◽  
Simulation Method ◽  
Design Methods ◽  
Pump Impeller ◽  
External Characteristic ◽  
Low Specific Speed ◽  
Specific Speed ◽  
Centrifugal Pump Impeller

In this work, the comparative study has been done for five kinds of design methods of the low specific speed centrifugal pump impeller adopted numerical simulation method by software of Fluent, so that the problems can be solved. Many different design methods exists for the low specific speed centrifugal pump impeller, which caused the design effect difficult to control. The numerical simulation method based on the Reynolds time averaged N-S equations (RANS) and RNG κ-ε turbulence models. Results revealed the inner flow pattern of these impeller, and these results were verified by external characteristic experiment. The research results showed that the design method, which adopted compound impeller with short blades and these short blades turned to the suction surface of long blades. Results proved that its flow distribution is even and external characteristic curve is more ideal.

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