复杂结构节流件非等温单相水阻力特性实验研究

Experimental Research on Hydraulic Resistance of Throttle Set with Special Structure under Non-Isothermal Condition with Single-Phase Water

采用理论推导和实验研究相结合的方法对非等温条件下的节流件阻力特性进行了研究。实验参数范围为:流量1.5～33kg/h,进口温度20～70℃,压力1.8～2.4MPa。通过研究节数、喉部直径以及温度、压力、流量和外部热源等参数对节流件阻力特性的影响,获得了计算节流件阻力的经验关系式。研究结果表明:节数、喉部直径和流量、温度等参数对节流件阻力特性的影响较大。入口温度相同时,外界热量的流入对节流件阻力影响较大,节流件进出口温升越大,阻力越小。

Experiments were done to examine the effects of geometric and operational parameters on the hydraulic resistance of throttle set,and the experimental parameters were as follows: flow rate ranged from 1.5 to 33 kg/h,inlet fluid temperature from 20 to 70°C,and pressure from 1.8 to 2.4 Mpa,respectively.An empirical equation for hydraulic resistance was obtained after the effects of pitch number of throttles,throat diameter,temperature,pressure,flow rate and outside heat source on the hydraulic resistance of throttle set were examined.The results indicated that the pitch number,throat diameter,flow rate and temperature has great effect on the resistance of throttle set;when the inlet temperature was constant,the effect of external heat flux on the resistance was considerable;the higher the heating power was,the higher the temperature rise between inlet and outlet was,and the less the resistance was.