CFD-based design and analysis of air-bearing-supported paint spray spindle

作     者：Ali Khaghani Kai Cheng 

作者机构：College of Engineering Design and Physical Sciences Brunel University London 

出 版 物：《Nanotechnology and Precision Engineering》 (纳米技术与精密工程（英文）)

年 卷 期：2018年第1卷第4期

页      面：226-235页

核心收录：

学科分类：08[工学] 0817[工学-化学工程与技术] 0807[工学-动力工程及工程热物理] 0804[工学-仪器科学与技术] 0802[工学-机械工程] 0703[理学-化学] 0811[工学-控制科学与工程] 0801[工学-力学（可授工学、理学学位）] 

基　　金：the PhD Scholarship Support at Brunel University London 

主　　题：Air-bearing CFD analysis Paint spray spindle Air-turbine design Turbine blade design and optimization 

摘      要：In this paper, an analytical scientific approach is presented for the design and analysis of an air-turbine-driven paint spray spindle, and it is used to improve further the design concept of the existing spindle applied in automotive coating and paint spraying applications. The current spindle on the market can operate at a maximum speed of 100,000 rpm and features a maximum bell size of 70 mm diameter. Given the increasing demands for high automotive coating/painting quality and productivity in assembly, the design and development of a paint spray spindle with a speed of 145,000 rpm or higher is needed. Computational fluid dynamics(CFD)-based simulation is applied in the approach. Accordingly, CFD simulation-based design and analysis are undertaken, covering the characteristic factors of velocity, pressure of the air supply, rotational speed of the air-turbine, and torque and force reaction on the turbine blades. Furthermore, the turbine blade geometric shape is investigated through the simulations. Three geometrical concepts have been investigated against the original model. The results on Concept_03 verified the higher angular velocity speeds against the theoretical model. The pressure and velocity effects in the blades have been investigated. The results show that the pressure and velocity of the air supply driving the turbine are critical factors influencing the stability of turbine spinning. The results also demonstrate that the force acting on the blades is at the highest level when the adjacent face changes from a straight surface into a curve. Finally, changing the geometrical shape in the turbine likely increases the tangential air pressure at the blades surface and relatively increases the magnitude of the lateral torque and force in the spindle. Notwithstanding this condition, the analytical values surpass the theoretical target values.