OPTIMIZING DESIGN OF BLADES FOR HIGH-SPEED AXIAL FANS

2020 ◽  
Vol 56 (6) ◽  
pp. 1024-1031
Author(s):  
A. M. Krasyuk ◽  
E. Yu. Russky
Keyword(s):  
High Speed ◽  
Optimizing Design ◽  
Axial Fans

ASSESSMENT OF MULTALL AS CFD CODE FOR THE ANALYSIS OF TUBE-AXIAL FANS

2021 ◽  
pp. 1-12
Author(s):  
Piero Danieli ◽  
Massimo Masi ◽  
Giovanni Delibra ◽  
Alessandro Corsini ◽  
Andrea Lazzaretto
Keyword(s):  
Experimental Data ◽  
Steady State ◽  
Velocity Distribution ◽  
High Speed ◽  
State Of The Art ◽  
Stable Operation ◽  
Pressure Curve ◽  
Analysis Tool ◽  
Low Speed ◽  
Axial Fans

Abstract This work deals with the application of the open source CFD code MULTALL to the analysis of tube-axial-fans. The code has been widely validated in the literature for high-speed turbomachine flows but not applied yet to low speed tutbomachines. The aim of this work is to assess the degree of reliability of MULTALL as a tool for simulating the internal flow in industrial axial-flow fan rotors. To this end, the predictions of the steady-state air flow field in the annular sector of a 315 mm tube-axial fan obtained by MULTALL 18.3 are compared with those obtained by two state-of-the-art CFD codes and experimental data of the global aerodynamic performance of the fan and the pitch-wise averaged velocity distribution downstream of the rotor. All the steady-state RANS calculations were performed on either fully structured hexahedron or hexa-dominant grids using classical formulations of algebraic turbulence models. The pressure curve and the trend of the aeraulic efficiency in the stable operation range of the fan predicted by MULTALL show very good agreement with both the experimental data and the other CFD results. Although the estimation of the fan efficiency predicted by MULTALL can be noticeably improved by the more sophisticated state-of-the-art CFD codes, the analysis of the velocity distribution at the rotor exit supports the use of MULTALL as a reliable CFD analysis tool for designers of low-speed axial fans.

scholarly journals DEVELOPMENT OF AERODYNAMIC DIAGRAMS OF HIGH-LOADED REVERSE AXIAL FANS

2020 ◽  
Vol 2 ◽  
pp. 72-81
Author(s):  
Pavel V. Kosykh
Keyword(s):  
Flow Rate ◽  
Total Pressure ◽  
High Speed ◽  
Guide Vane ◽  
Pressure Coefficient ◽  
Aerodynamic Characteristics ◽  
Inlet Guide Vane ◽  
Ansys Software ◽  
Axial Fans ◽  
Limiting Values

Present-day achievements in the field of strength calculation and structural optimization allow creating main mine fans with higher tip speed than in currently used machines. The paper considers the features of calculating the aerodynamic diagrams of mine reverse axial fans with a tip speed over 200 m/s. It is shown that at such speed it is possible to obtain high-flow fans with significantly smaller dimensions than their existing counterparts. Aerodynamic diagrams with high reverse characteristics (flow rate of more than 0.7 from the direct mode for the network of the same aerodynamic characteristics as in direct mode) are developed. The aerodynamic characteristics of the developed diagrams are calculated in the ANSYS software package. It is shown that an increase in the tip speed contributes to an increase in reverse properties of fans compared to less high-speed machines designed for the same total pressure. The limiting values of axial velocity coefficient and pressure coefficient are determined, at which it is possible to obtain a fan without an inlet guide vane, with a monotonic dependence of total pressure on flow rate.

A parametric fin structure design study for cooling aerospace electro-mechanical actuators with high-speed axial fans

2019 ◽  
Vol 56 (5) ◽  
pp. 1565-1577
Author(s):  
Osama Mesalhy ◽  
Cody Rath ◽  
Daniel Rini ◽  
John Kizito ◽  
Quinn Leland ◽  
...  
Keyword(s):  
High Speed ◽  
Structure Design ◽  
Design Study ◽  
Axial Fans

Application of Computer Simulation in Developing Automotive Parts of Al Alloy by Using Semi-Solid Die Cast Process

2006 ◽  
Vol 116-117 ◽  
pp. 630-634 ◽  
Author(s):  
Yi Tao Yang ◽  
Heng Hua Zhang ◽  
Guang Jie Shao
Keyword(s):  
Computer Simulation ◽  
High Speed ◽  
Al Alloy ◽  
Filling Process ◽  
Forming Process ◽  
Die Cast ◽  
Optimizing Design ◽  
Simulation And Experiment ◽  
Automotive Parts ◽  
Semi Solid

To aid the optimizing design of filling system, computer simulation technique is introduced to predict injection-forming process and to protect defects during trial manufacture of automotive parts by using semi-solid die cast process. By comparing formed appearance of parts in experiments and that in simulations, and observing the relationship between internal defects inspected by X-ray and flow field obtained in simulation, it is indicated that there are quite good agreements between simulation and experiment, right predictions for cast defects resulting from filling process can be made and improving direction is proposed. The realization of numerical visualization for filling process of high speed during semi-solid die cast process will play an important role in optimizing technology plan and process.

Optimizing Design for the Traveling Wave Electrodes in Low-Drive High-Speed Electro-Optic Polymer Modulators

2005 ◽  
Vol 24 (6) ◽  
pp. 521-528 ◽  
Author(s):  
Kun Liang ◽  
Qiong Song ◽  
Fei Lu ◽  
Boyu Wu ◽  
Wang Chen ◽  
...  
Keyword(s):  
Traveling Wave ◽  
High Speed ◽  
Electro Optic ◽  
Optimizing Design ◽  
Polymer Modulators

Assessment of MULTALL As CFD Code for the Analysis of Tube-Axial Fans

2020 ◽  
Author(s):  
Piero Danieli ◽  
Massimo Masi ◽  
Giovanni Delibra ◽  
Alessandro Corsini ◽  
Andrea Lazzaretto
Keyword(s):  
Experimental Data ◽  
Steady State ◽  
Velocity Distribution ◽  
High Speed ◽  
State Of The Art ◽  
Stable Operation ◽  
Pressure Curve ◽  
Analysis Tool ◽  
Low Speed ◽  
Axial Fans

Abstract This work deals with the application of the open source CFD code MULTALL to the analysis of tube-axial-fans. The code has been widely validated in the literature for high-speed turbomachine flows but not applied yet to low speed tutbomachines. The aim of this work is to assess the degree of reliability of MULTALL as a tool for simulating the internal flow in industrial axial-flow fan rotors. To this end, the predictions of the steady-state air flow field in the annular sector of a 315mm tube-axial fan obtained by MULTALL 18.3 are compared with those obtained by two state-of-the-art CFD codes and experimental data of the global aerodynamic performance of the fan and the pitch-wise averaged velocity distribution downstream of the rotor. All the steady-state RANS calculations were performed on either fully structured hexahedron or hexa-dominant grids using classical formulations of algebraic turbulence models. The pressure curve and the trend of the aeraulic efficiency in the stable operation range of the fan predicted by MULTALL show very good agreement with both the experimental data and the other CFD results. Although the estimation of the fan efficiency predicted by MULTALL can be noticeably improved by the more sophisticated state-of-the-art CFD codes, the analysis of the velocity distribution at the rotor exit supports the use of MULTALL as a reliable CFD analysis tool for designers of low-speed axial fans.

Electromagnetic Compatibility of PCB Based on Electromagnetic Simulation Methods

2014 ◽  
Vol 556-562 ◽  
pp. 1794-1797 ◽  
Author(s):  
Zhu Ting Yao ◽  
Jing Jing Ge
Keyword(s):  
High Speed ◽  
Electromagnetic Compatibility ◽  
Point Of View ◽  
Design Problems ◽  
Logical Point ◽  
Pcb Design ◽  
Optimizing Design ◽  
Circuit Fabrication ◽  
Power Direction ◽  
High Speed Design

With the circuit fabrication technology continues toward high-speed, high-density, low-power direction, modern circuit design techniques have changed radically. The speed improvement of digital system means rise and fall time of signals as short as possible, the improvement of frequency and edge rates will bring a series of high-speed design problems, these problems bring great challenges to the system hardware design, the correct design from logical point of view, if there is improper in the actual PCB design will lead to failure of the entire design. EMI radiation of PCB is analyzed, EMC simulation of PCB and optimizing improved are finished. The PCB electromagnetic compatibility is analyzed by using Protel 99SE and Ansoft Designer 2.2 software, and simulation result indicates optimizing design is correct and effective.

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