Character of flow field on turbine blade with 3-electrode feeding method in electrochemical machining

2008 ◽  
Vol 44 (04) ◽  
pp. 189 ◽  
Author(s):  
Zhengyang XU
Keyword(s):  
Flow Field ◽  
Turbine Blade ◽  
Electrochemical Machining ◽  
Feeding Method

Comparative Analysis of Flow Field in Mixed and Non Mixed Gas Electrochemical Machining for Aero-Engine Turbine Blade Cooling Holes

2017 ◽  
Vol 868 ◽  
pp. 166-171
Author(s):  
Zhing Yong Li ◽  
Xiu Ting Wei ◽  
Wen Wen Lu ◽  
Qing Wei Cui
Keyword(s):  
Flow Field ◽  
Flow Velocity ◽  
Turbine Blade ◽  
Electrochemical Machining ◽  
Machining Accuracy ◽  
Mixed Gas ◽  
Turbine Blade Cooling ◽  
Blade Cooling ◽  
Vortex Zone ◽  
Aero Engine

By the cooling holes in aero-engine turbine blade as the research object, this study focuses on two kinds of ECM methods, which are mix gas added to the nonlinear electrolyte (NaNO3) and non-mixed gas. Mixed and non-mixed gas ECM experiments of turbine blade cooling holes were carried out respectively. The corresponding two-dimensional CAD model of cooling hole was constructed combined with the experimental data and theoretical analysis. Numerical simulation analysis was carried out of the flow field base on the above models by using the fluid dynamics analysis software FLUENT. The influence flow velocity and flow velocity distribution on the machining accuracy and efficiency of ECM were investigated in detail. The vortex zone distribution of gas-NaNO3 mixed phase flow field and single NaNO3 solution flow field was analyzed qualitatively. The simulation results indicated that the flow velocity in the machining gap with mixed gas was significantly higher than the velocity during ECM process for cooling holes. The electrolytic products and heat were washed away completely, the electrolyte can be updated in time. Fluid vortex zone distribution was improved obviously, the flow field distribution became more uniform after mixed gas in ECM process. The machining accuracy and efficiency for cooling holes making may be improved greatly with gas mixed in electrolyte NaNO3.

scholarly journals Key Technology of the Electrochemical Machining Flow Field in Aero-rotor Blades Made of Inconel®718

2021 ◽  
Author(s):  
Liang HUANG ◽  
Yan CAO ◽  
Chunlei TIAN ◽  
Ruochen ZHAO ◽  
Jiang DU ◽  
...  
Keyword(s):  
Flow Field ◽  
Electrochemical Machining ◽  
Rotor Blades ◽  
Key Technology

Simulation and Experiment Research on Liquid Channel of Diffuser Blade by Electrochemical Machining

2021 ◽  
Author(s):  
Jinkai Xu ◽  
Jin Tao ◽  
Wanfei Ren ◽  
Kun Tian ◽  
Xiaoqing Sun ◽  
...  
Keyword(s):  
Flow Field ◽  
Electrochemical Machining ◽  
Leading Edge ◽  
Feed Speed ◽  
Trailing Edge ◽  
Gap Flow ◽  
Clearance Flow ◽  
Field Uniformity ◽  
Simulation And Experiment ◽  
Channel Center

Abstract Aiming to solve the problems of the low electrolyte flow rate at leading edge and trailing edge and poor uniformity of the end clearance flow field during the electrochemical machining (ECM) of diffuser blades, a gap flow field simulation model was established by designing three liquid-increasing channels at the leading edge and the trailing edge of the cathode. The simulation results indicate that the liquid-increasing hole channel (LIHC) with an outlet area S of 1.5 mm2 and a distance L from channel center to edge point of 3.2 mm achieves optimal performance. In addition, the experiment results show that the optimized cathode with liquid-increasing hole channel (LIHC) significantly improves the machining efficiency, accuracy and surface quality. Specifically, the feed speed increased from 0.25 mm/min to 0.43 mm/min, the taper decreased from 4.02° to 2.45°, the surface roughness value of blade back reduced from 1.146 µm to 0.802 µm. Moreoever, the roughness of blade basin decreased from 0.961 µm to 0.708 µm, and the roughness of hub reduced from 0.179 µm to 0.119 µm. The results prove the effectiveness of the proposed method, and can be used for ECM of other complex structures with poor flow field uniformity.

Simulation and Experimental Study on Improving Electrochemical Machining Stability of High Convex Structure on Casing Surface by Using Backwater Pressure

2021 ◽  
Author(s):  
Zhenghui Ge ◽  
Wangwang Chen ◽  
Yongwei Zhu
Keyword(s):  
Flow Field ◽  
Electrochemical Machining ◽  
Back Pressure ◽  
Convex Structure ◽  
Flow Field Characteristics ◽  
Simulation And Experiment ◽  
Different Shapes ◽  
Simulation Results ◽  
Structure Height ◽  
Engine Components

Abstract Casing parts are regarded as one of the key components in aero-engine components. Most casing parts are attached with different shapes of convex structures, and their heights range from hundreds of microns to tens of millimeters. The use of profiling blocky electrodes for electrochemical machining of casing parts is a widely used method, especially in the processing of high convex structures. However, with the increase of convex structure height, the flow field of machining areas will become more complex, and short circuits may occur at any time. In this study, a method to improve the flow field characteristics of machining area by adjusting the backwater pressure is proposed, the simulation and experiment are carried out respectively. The simulation results showed that the back-pressure mehtod can significantly improve the uniformity of the flow field around the convex structure compared with the extraction outlet mode and the open outlet mode, and then the optimized back-pressure of 0.5 MPa was obtained according to simulation results. The experimental results showed that under condition of the optimized back-pressure parameters, the cathode feed-rate increased from 0.6 mm/min to 0.8 mm/min, and the convex structure with a height of 18 mm was successfully machined. This indicated that the back-pressure method is suitable and effective for the electrochemical machining of high convex structure with blocky electrode.

Sign in / Sign up

Export Citation Format

Share Document