CAJ | 학술논문

基于传统的切割定律换算发现在小流量工况下，叶轮切割值不能按照传统的切割定律来选取。为了研究不同叶片切割值对低比速双吸离心泵性能的影响，以M S59―160型双吸式离心泵为研究对象，对其叶片进行 V型切割，采用C FD数值模拟对切割后的双吸离心泵流体动力性能进行预测。研究结果表明：小流量工况下，效率预测值比试验值略低，而大流量工况时二者吻合较好；随着切割角度的增加，叶轮出口处及蜗壳内的高压区呈梯度扩散且压差逐渐减少；当角度15°时，叶轮出口和蜗壳内部的压力梯度分布相较于切割前分布变得均匀；叶轮效率降低的主要原因是叶轮内部出现漩涡，随着切割角度的增加，漩涡面积剧增且在叶轮出口靠近前盖板处。
기우전통적절할정률환산발현재소류량공황하，협륜절할치불능안조전통적절할정률래선취。위료연구불동협편절할치대저비속쌍흡리심빙성능적영향，이M S59―160형쌍흡식리심빙위연구대상，대기협편진행 V형절할，채용C FD수치모의대절할후적쌍흡리심빙류체동력성능진행예측。연구결과표명：소류량공황하，효솔예측치비시험치략저，이대류량공황시이자문합교호；수착절할각도적증가，협륜출구처급와각내적고압구정제도확산차압차축점감소；당각도15°시，협륜출구화와각내부적압력제도분포상교우절할전분포변득균균；협륜효솔강저적주요원인시협륜내부출현선와，수착절할각도적증가，선와면적극증차재협륜출구고근전개판처。
After the conversion based on the traditional trimming law found the value of cutting cannot be selected in accordance with the trimming law under small flow rate conditions .For doing research on the influence of blades trim on performance of low specific speed double suction centrifugal pumps ,as the research object the MS59 - 160 double suction centrifugal pump's blades is v―shaped cutting ,and then based on the CFD numerical simulation the hydrodynamic performance of double suction pump after trimming is predicted .The research results show that the prediction efficiency is slightly lower than the test results at the small flow rate .On the contrary ,which can better coincide during the large flow rate .With the increase in cutting angle ,the outlet of the impeller and volute produced high gradient diffusion and the differential pressure gradually decreased .When the angle is 15° ,the pressure gradient distribution becomes uniform compared with before cutting in the outlet of impeller and internal of volute .From the distribution of streamline ,the main reason of the low efficiency of impellers comes to the internal spiral ,with the increase in cutting angle ,the vortex area is surge in the outlet of impeller near the shroud .