CAJ | 학술논문

在200～450 kg/(m~2·s)的低质量流速下,采用φ31.8 mm×6 mm的6头内螺纹管,在高压试验台上进行了垂直和倾斜并联内螺纹管两相流不稳定性对比试验研究.研究表明:对压力降脉动和密度波脉动,随着进口压力和质量流速的增加,发生脉动的界限热负荷增加,垂直并联管的界限热负荷总是大于倾斜并联管,说明垂直并联内螺纹管的稳定性更好;过冷度对脉动发生的界限热负荷和脉动周期的影响出现不同的趋势.通过对试验数据进行回归处理,给出了两种条件下发生不稳定性脉动的起始点无因次准则方程.
재200～450 kg/(m~2·s)적저질량류속하,채용φ31.8 mm×6 mm적6두내라문관,재고압시험태상진행료수직화경사병련내라문관량상류불은정성대비시험연구.연구표명:대압력강맥동화밀도파맥동,수착진구압력화질량류속적증가,발생맥동적계한열부하증가,수직병련관적계한열부하총시대우경사병련관,설명수직병련내라문관적은정성경호;과랭도대맥동발생적계한열부하화맥동주기적영향출현불동적추세.통과대시험수거진행회귀처리,급출료량충조건하발생불은정성맥동적기시점무인차준칙방정.
An experiment was conducted to investigate the two-phase flow instability in the vertical parallel rifled tubes and inclined parallel rifled tubes using six-head rifled tubes with a diameter of 31.8 mm in the mass flow rate range of 200-450kg/(m~2·s)in a high pressure test loop.The experimental results show that the boundary heat flux of the pressure-drop type oscillation or the density-wave type oscillation increased with the increase of the inlet pressure and the mass flow rate,and the boundary heat flux for the vertical parallel rifled tubes was greater than that for inclined parallel rifled tubes,indicating that the flow in vertical parallel rifled tubes would be more stable.The effects of inlet subcooling degree on the boundary heat flux and the oscillation period exhibited two different trends in the test.In addition,non-dimensional correlations of thresholds of heat flux both in the vertical parallel rifled tube and the inclined parallel rifled tube were obtained by the regression calculation of the test data.