Experimental study on adjustable ejectors in secondary heating pipe networks

This paper simulates the actual working conditions of an adjustable ejector used in a secondary heating pipe network by building an ejector test bench, and analyses the influence of working fluid pressure, working pressure difference and user resistance on the operating characteristics of the adjustable ejector. The experimental results show that when the working pressure difference is constant, the maximum injection coefficient and injection efficiency of the ejector change slightly with the increase of the working fluid pressure. When the working pressure difference of the ejector increases, the maximum injection coefficient increases significantly. When the user resistance increases, the injection coefficient decreases. When the user resistance is greater than 0.065 MPa, the ejector fails to eject.