火箭推进

为探究口环间隙对离心泵性能的影响,以双级低比转速高速离心泵为研究对象,测量了原型及减小口环间隙改进型的水力性能,对比了两种方案的测试结果,结合试验数据和计算分析了口环间隙对离心泵泄漏损耗及摩擦损耗的影响。结果表明:减小口环间隙能有效提高离心泵的扬程及效率,改进方案的泵效率提升约5%; 在设计转速测量工况范围内,随着流量的增大,原型方案的扬程系数逐渐下降,小口环间隙方案的扬程系数变化较小,扬程系数下降使得计算的泄漏损耗占比变化更加显著; 尽管减小口环间隙会增加摩擦损耗,但考虑泄漏损耗的影响时,确保运行安全的情况下减小口环间隙是提高泵性能的有效途径。

In order to explore the impacts of ring clearance on the performance of centrifugal pumps, a two-stage low specific speed centrifugal pump with high speed is chosen as the research object. The hydraulic performance of the prototype and improved scheme with decreased ring clearance are measured at multiple operation points, the test results of these two schemes are compared, and the influences of wear ring clearance on the leakage loss and friction loss are analyzed by experiments and empirical formula calculations. As a result, the reduction of ring clearance can effectively enhance the head and efficiency of centrifugal pumps, and the pump efficiency of the improved scheme is increased by 5%. In the range of measurement conditions at the designed speed, with the increase of the flow, the head coefficient of the prototype gradually decreases, while the change of the improved scheme is not obvious. The decrease in the head coefficient makes the change in the calculated leakage loss ratio more obvious. Although the friction loss is higher with a smaller ring clearance, reducing the ring clearance is an available approach to improve the pump performance which reduces the leakage loss remarkably.

引言
1 试验台及试验方案
2 试验结果分析
3 结论

图1 高速电动泵综合测试示意图<br/>Fig.1 Integrated test schematic for high-speed electric pumps

图1 高速电动泵综合测试示意图
Fig.1 Integrated test schematic for high-speed electric pumps

图2 电动泵供电及电参数测试示意图<br/>Fig.2 Schematic of power supply and parameters measurement of the electric pump

图2 电动泵供电及电参数测试示意图
Fig.2 Schematic of power supply and parameters measurement of the electric pump

图3 高速离心泵示意图<br/>Fig.3 Schematic of high speed centrifugal pumps

图3 高速离心泵示意图
Fig.3 Schematic of high speed centrifugal pumps

表1 试验方案口环间隙减小量<br/>Tab.1 Decrements of ring clearances for test schemes

表1 试验方案口环间隙减小量
Tab.1 Decrements of ring clearances for test schemes

图4 原型方案转速与扬程、效率关系<br/>Fig.4 Relationship between pump head, efficiency and rotating speed of the prototype scheme

图4 原型方案转速与扬程、效率关系
Fig.4 Relationship between pump head, efficiency and rotating speed of the prototype scheme

图5 原型方案变转速特性<br/>Fig.5 Characteristic of the pump with variable rotate speed

图5 原型方案变转速特性
Fig.5 Characteristic of the pump with variable rotate speed

图6 原型与改进方案性能对比<br/>Fig.6 Comparison of performance between the prototype and improved schemes

图6 原型与改进方案性能对比
Fig.6 Comparison of performance between the prototype and improved schemes

图7 原型与改进方案泵特性曲线对比<br/>Fig.7 Comparison of pump characteristic curves between the prototype and improved schemes

图7 原型与改进方案泵特性曲线对比
Fig.7 Comparison of pump characteristic curves between the prototype and improved schemes

图8 不同转速的口环相对泄漏流量、泵泄漏损耗占比及摩擦损耗占比对比<br/>Fig.8 Comparison of relative leakage mass flow, leakage loss ratio and friction loss ratio of the pump at various speeds

图8 不同转速的口环相对泄漏流量、泵泄漏损耗占比及摩擦损耗占比对比
Fig.8 Comparison of relative leakage mass flow, leakage loss ratio and friction loss ratio of the pump at various speeds

图9 同一转速下不同出口流量的口环相对泄漏量、泵泄漏损耗及摩擦损耗对比<br/>Fig.9 Relative leakage mass flow, leakage loss ratio and friction loss ratio of the pump at various flow coefficients

图9 同一转速下不同出口流量的口环相对泄漏量、泵泄漏损耗及摩擦损耗对比
Fig.9 Relative leakage mass flow, leakage loss ratio and friction loss ratio of the pump at various flow coefficients

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备注

引言

1 试验台及试验方案

2 试验结果分析

3 结论

期刊信息