CAJ | 학술논문

为揭示双蜗壳离心泵的水力不稳定性,采用雷诺时均方法和SST k-ω湍流模型,对一双蜗壳双吸离心泵进行了三维非定常湍流数值模拟,得到了泵内部流场特性及双蜗壳内压力脉动情况.并对其进行了频谱分析.结果表明双蜗壳内存在比较明显的压力脉动.设计工况下压水室内的压力脉动强度小于非设计工况.在设计工况下,隔舌处和隔板区压力脉动频率均以叶片通过频率为主,其中隔板起始端的脉动幅值最大,约为隔舌处的2.5倍.在大流量工况下,隔舌处和隔板起始端压力脉动频率以叶片通过频率为主,而小流量工况下以叶轮转顿为主.叶轮受到的径向力随着叶轮的旋转呈现不稳定性,其中小流量工况时最明显.3种工况下径向力均指向隔板起始端侧.
위게시쌍와각리심빙적수력불은정성,채용뢰낙시균방법화SST k-ω단류모형,대일쌍와각쌍흡리심빙진행료삼유비정상단류수치모의,득도료빙내부류장특성급쌍와각내압력맥동정황.병대기진행료빈보분석.결과표명쌍와각내존재비교명현적압력맥동.설계공황하압수실내적압력맥동강도소우비설계공황.재설계공황하,격설처화격판구압력맥동빈솔균이협편통과빈솔위주,기중격판기시단적맥동폭치최대,약위격설처적2.5배.재대류량공황하,격설처화격판기시단압력맥동빈솔이협편통과빈솔위주,이소류량공황하이협륜전돈위주.협륜수도적경향력수착협륜적선전정현불은정성,기중소류량공황시최명현.3충공황하경향력균지향격판기시단측.
The three-dimensional, unsteady Reynolds-averaged Navier-Stokes equations with shear stress transport turbulent (SST) models were solved to investigate the flow field and the characteristic of pressure fluctuations in the double volute. The results show that the pressure fluctuations are strong in the double volute. The pressure fluctuations in the volute are relatively low at the design flow rate condition. The blade passing frequency dominates the pressure fluctuations near the volute tongue and the clapboard at the design flow rate condition. The amplitude of the pressure fluctuation is largest at the beginning of clapboard, which is 2.5 times larger than at the volute tongue. At the large flow rate condition, the blade passing frequency is also dominative in the pressure fluctuations, but at the small flow rate condition the rotation frequency becomes dominative. The radial force on the impeller is unsteady especially at the small flow rate. At three flow rates, the radial forces all point at the beginning of clapboard.