二级供暖管网中可调式喷射泵的实验研究
Experimental study on adjustable ejectors in secondary heating pipe networks
摘要：
通过搭建喷射泵实验台,模拟了一种应用于二级供暖管网中的可调式喷射泵的实际工况,分析了工作流体压力、工作压差和用户阻力对可调式喷射泵运行特性的影响。实验结果表明:在工作压差不变的情况下,随着工作流体压力的增大,喷射泵的最大喷射系数和最高喷射效率变化幅度较小;喷射泵工作压差增大时,最大喷射系数显著增大;用户阻力增大时,喷射系数减小,用户阻力大于0.065 MPa时,喷射泵出现引射失效现象。
Abstract：
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.
Keywords:ejector; heating; secondary pipe network; injection coefficient; fluid pressure; working pressure difference; user resistance; valve opening