螺旋管锅炉反应器管内汽液两相流压力降脉动研究

EXPERIMENTAL INVESTIGATION OF PRESSURE DROP OSCILLATIONS OF STEAM-WATER TWO-PHASE FLOW IN HELICALLY COILED TUBING BOILER-REACTORS

本又根据闭式循环热动力推进系统中锅炉反应器的各种可能的航行方向及运行参数，对螺旋管内汽液两相流压力降脉动特性进行了系统的试验研究，首次区分了两类不同特征的压力降脉动并得到了各主要因素的影响现律和发生脉动的界限准则。

An experimental investigation is described of the characteristics of pressure drop oscil-lations in helically coiled tubes using a steamuswater two-phase flow closed circulation testloop at pressure from 0.3～3.5 MPa. The heliX axis of helically coiled tubes were arrangedin four different inclinations, that is, horizontal, upwardly inclined 45°, downwardly inclined45°, and upwardly vertical. Two kinds of regions for pressure drop oscillations are classified.We describe their dependance on the arranged position of compressible volume in upstreamof heated evaporating sections and its values in addition to the system parameters such aspressure, mass flowrate, inlet subcooling and heat flux. Utilizing the experimental data to-gether with conservation constraints, two correlations are proposed for the occurrence of twokinds of regions for pressure drop oscillations.