Abstract: With the method of mechanical pressure in inhaled segment of the ejector，a new approach to improve the ejecting performance of the system was discussed. The analysis of the experimental data indicated that the ejecting performance can be improved after mechanical pressurization，and the ejecting performance improved more obviously as the working water temperature increased with the new method. The suction steam flow is 3.80—5.35 times of the traditional system while the working water temperature is greater than or equal to 75 ℃，and the change value of ejective temperature was increased by 1.3—5.5 ℃，the absorbed heat of the unit working water is 2803—5051 kJ/kg higher than that of traditional method. Moreover，the cost effectiveness was 20 times higher than that of the consumption of electricity compared with the traditional method.

Key words: two-phase jet flow, inhaled segment, mechanical pressurization, ejecting performance, economic efficiency

摘要： 通过对液-汽两相喷射器吸入段进行机械加压，探讨了系统的引射性能的变化。实验结果表明，通过对喷射器吸入段进行机械加压能够提高系统的引射性能，且工作水温度越高，机械加压后引射性能提高越明显。当工作水温度≥75 ℃时，机械加压方式吸入蒸汽流量是加压前的3.80～5.35倍，工作水的升温幅度比传统方式提高了1.3～5.5 ℃，单位工作水流量吸收的热量提高了2803～5051 kJ/kg。此外，与传统方式相比，吸入段机械加压方式节约的蒸汽费用是所耗电费的20倍，提高了系统的经济效益。

关键词: 两相射流, 吸入段, 机械加压, 引射性能, 经济效益