不同倾角放置螺旋管汽波两相摩擦阻力特性

在宽广的参数范围内试验研究了螺旋管在不同倾角放置时的单相及汽液两相摩擦阻力特性,获得了螺旋管放置方向及各主要系统参数对汽液两相摩擦阻力特性的影响规律。在对试验结果及前人研究结果进行详细分析的基础上,获得了第一个能适用于不同倾角放置螺旋管的单相及汽液两相摩擦阻力计算式,从而为汽液两相摩擦阻力及螺旋管的进一步研究和应用提供了依据。

FRICTIONAL PRESSURE DROP CHARACTERISTICS OF STEAM-WATER TWO-PHASE FLOW IN HELICALLY COILED TUBES ORIENTED WITH VARIOUS AXIAL ANGLES

In this paper, an experimental and theoretical investigation on the characteristics of factional pressure losses of steam - water two - phase flow in helically coiled tubes was conducted in a wide range of system and flow parameters, which are as follows: system pressure p =0.5 -3.5 MPa; mass flow rate G = 200-4300 kg·m-2·s-1; heat flux q =0-580 kW·m-2; exit mass quality x= -0.01- +1.2. The angle between the central axis of helically coiled tube and horizontal line: θ= 0°, + 45°, 90°, - 45°. The experimental results were analyzed and compared with some correlation and data proposed in previous literature. Based on Chens correlation and our experimental data, a new revised correlation was proposed for the calculation of frictional pressure drop of gas liquid two - phase flow in helically coiled tubes oriented with various axial angles. A good agreement was arrived between the calculated values and experimental data.