CAJ | 학술논문

为研究双向泵在正、反向运行时非稳定区的内流特性，以名以比转速为1600的双向轴流泵为研究对象，采用标准k－ε湍流模型对双向泵进行了正反向、多工况下的非定常数值模拟，比较了正、反向马鞍区内泵的内流特征及压力脉动变化情况，结果表明：反向时鞍型曲线出现的流量减小，马鞍区范围变窄；在所研究工况，正、反向运行时在叶片进口前靠近壁面处、出口后靠近轮毂处以及导叶内均出现了较大尺度漩涡，反向时，叶轮前的大尺度漩涡向上游移动，在轮毂后也形成了较大的回流区，同时，由于流场的非稳定特性，正向在1～2、4～5倍转频，反向在0～2倍转频出现了明显的压力脉动。
위연구쌍향빙재정、반향운행시비은정구적내류특성，이명이비전속위1600적쌍향축류빙위연구대상，채용표준k－ε단류모형대쌍향빙진행료정반향、다공황하적비정상수치모의，비교료정、반향마안구내빙적내류특정급압력맥동변화정황，결과표명：반향시안형곡선출현적류량감소，마안구범위변착；재소연구공황，정、반향운행시재협편진구전고근벽면처、출구후고근륜곡처이급도협내균출현료교대척도선와，반향시，협륜전적대척도선와향상유이동，재륜곡후야형성료교대적회류구，동시，유우류장적비은정특성，정향재1～2、4～5배전빈，반향재0～2배전빈출현료명현적압력맥동。
In order to analyze the flow characteristics in unstable areas of both positive and revere operation,the unsteady nu-merical simulations in multi-conditions of positive and revere operation were carried out based on standard k-ε turbulence model for a bi-directional pump that approximate specific speed was 1600,and then the flow characteristics and pressure pulsation chan-ges along flow channel were compared.The results show that the saddle-shaped curve appears in a lower flow rate and the range of saddle-shaped curve becomes narrower in reverse operation.There are large scale vortexes close to the front of blade inlet and tube wall,near the back of blade outlet and hub,and the vortex also occurs in guide vane zone.Under reverse operation,the large scale vortexes move to upstream,and a large backflow appears after the fluid flowed hub.Due to the unsteady characteristics of the flow field,there are obvious pressure pulsations on 1~2、4~5 times of rotation frequency in positive operation and 0~2 times of rota-tion frequency in positive operation.