中文摘要：

基于低温流体泵的设计理论,研制一台高速部分流低温液氮泵用以验证低温下水力特性.搭建一套闭式过冷低温泵外特性低温测试系统,可实现低温流体泵在无气蚀和无气缚条件下测试.设计的增压性系统可控制泵入口流体压力,并监测泵头处液位.通过改变系统管阻和电机变频,试验测试了低温流体泵的各项水力性能,试验结果表明：转速1.52×10^4 r/min,流量0.2L/s为最大效率工况点;此时的压头为46m,功率为200W,效率为36.3%,与理论值偏差分别为12%,4%和9%,具有较好的一致性.低温液氮泵的性能可满足设计要求,外特性低温测试系统精简,测量精度高.

英文摘要：

Based on the design theory of cryogenic liquid pump,a high speed partial emission cryogenic liquid nitrogen pump was developed to test the cryogenic hydraulic characteristics.A cryogenic supercooling test facility was designed which was used for pressurization.In the conditions of no cavitation and airless,accurate test was a chieved.The pressurization of closed system was used to control the inlet pressure and monitor the level of pump head.In the adjustment mode of variable diameter and speed,the actual hydraulic performance of pump were measured in a test facility prepared.Test results show that the high speed partial emission cryogenic pump achieves performance levels,providing a head of 46 m,power of 200 Wand efficiency of 36.3%at the speed of 1.52×10^4 r/min and the volume flow of 0.2L/s,respectively,and the deviation of theoretical and test value is 12%,4% and9%.Therefore,the response of pump is in good agreement with that of theoretical analysis.The cryogenic liquid pump can meet the design requirements.The cryogenic test system of pump has the simplified structure and high measurement accuracy.