绝热毛细管流量快速计算模型

针对毛细管进口压力、状态以及结构尺寸变化对毛细管流量的影响,提出一种新的毛细管流量快速计算公式.该公式为显式形式,不存在迭代,保证了流量计算的快速性和绝对稳定性.在给定出口背压情况下,可判定出口是否为临界流.利用取点软件从ASHER Handbook诺模图上取点进行验证,结果表明,流量平均相对误差为2.17%,最大相对误差为13.42%,结果较理想;对毛细管内径、长度和进口过冷度(干度)变化引起流量变化进行分析,结果表明,所提出的模型可直接用于毛细管流量计算.

Fast Calculation Model of Adiabatic Capillary Tube Flow

For the impact of capillary import pressure, import status, and structural changes on capillary flow, this paper proposed a new fast calculation formula. The formula has the explicit form, in which does not exist iteration, and it guarantees high speed and absolute stability of the flow calculation. When the back pressure is given, the export flow can be judged whether it is a critical flow. Software is used to check point from the ASHER Handbook nomogram and a verification is given. The result shows that the average relative deviation is 2.17%, the largest relative deviation is 13.42%, the result is ideal. At the same time, the influence of the capillary diameter, length, and import status on the capillary flow is analyzed. The model can be used in capillary flow calculation model directly.