Numerical simulation of blade-type adjustable steam ejector

As a kind of pressurizing equipment, the ejector has some problems, such as low efficiency and poor anti-wave ability. The design of the adjustable ejector can improve the efficiency of ejector and broaden the application range. In this paper, a blade-type adjustable ejector is proposed for the first time. Firstly, the computational fluid dynamics model is established and verified by experimental data. The effects of different working pressures, blade openings and back pressures on the blade-type adjustable ejector performance are analyzed, and we also analyze the influence of blade geometric parameters (blade angle, blade height, blade number) on the blade-type adjustable ejector. Compared with the traditional fixed steam ejector, when the working conditions change, by changing the geometric parameters of the blade-type adjustable ejector, the entrainment ratio of the blade-type adjustable ejector is always greater than 0.71 and the efficiency is always greater than 13%. The entrainment ratio can be increased by 204% and the efficiency can be increased by 8.49%. In addition, the geometrical parameters of the blade are optimized and the sensitivity analysis is carried out by orthogonal test, which further improves the performance of the ejector. According to the sensitivity analysis results, the order is: blade number, blade height, blade angle. When the working condition changes, the ejector designed in this paper can operate efficiently in a wide working range by adjusting its parameters. At the same time, this study broadens the research direction of the adjustable ejector and provides more extensive reference for the design of the adjustable ejector.