Energy loss evaluation in a side channel pump under different wrapping angles using entropy production method
Energy loss evaluation in a side channel pump under different wrapping angles using entropy production method
复制标题
采用熵产法评估不同包角下侧通道泵的能量损失
DOI：
10.1016/j.icheatmasstransfer.2020.104526
复制
发表时间：
2020-04-01
影响因子：
7
通讯作者：
Wei, Xueyuan
中科院分区：
文献类型：
--
作者：
Zhang, Fan;Appiah, Desmond;Wei, Xueyuan
普通叶片泵如离心泵的流动损失已经得到了广泛的研究，而对食品加工和石油化工行业中常用的侧通道泵的研究关注较少。因此，这项研究揭示了准确的区域高水力损失的侧通道泵模型使用熵损失生产方法。采用非定常雷诺平均Navier-Stokes（RANS）方程和剪切应力输运（SST）k-ω湍流模型，计算了该流动的熵耗散分量。通过与包角为30 °的泵壳2的实验测量值的比较，验证了数值方法的准确性。结果表明，叶轮域比侧通道产生更高的损失。叶轮通常在144处记录最高的zeta（D '）损失系数，而侧通道在zeta（D'）< 6处记录最低。叶轮区域的高熵损失主要与不规则的速度场有关。此外，在所有泵壳中，在叶轮的内半径处可视化的损失高于外半径。所有泵壳的所有叶轮通道的内径与外径相比显示出更高的损失系数（zeta（D '）> 0.2），并且随着流量的增加而平缓地减小。尽管如此，在所有泵的情况下产生的高损失，情况1产生了最高的能量损失相比，其他泵的情况下，即使它有最好的水力性能。因此，这项研究有助于侧通道泵的基础知识，提供了高能量损失的区域，为进一步优化的主要几何部件，特别是叶轮。这将有助于提高侧通道泵的性能和运行可靠性，并增强其应用。
Flow losses in common vanned pumps such as centrifugal pumps have been widely studied, while less research attention has been paid to side channel pumps that are commonly used in the food processing and petrochemical industries. Therefore, this study reveals the exact regions of high hydraulic losses for side channel pump models using the entropy loss production method. Numerical calculations based on unsteady Reynolds-averaged Navier-Stokes (RANS) equations coupled with the shear stress transport (SST) k-omega turbulence model were used to acquire the entropy dissipative components of the flow. The accuracy of the numerical method was validated by comparing the experimental measurements of pump case 2 with a wrapping angle of 30 degrees. The results showed that the impeller domain produced higher losses compared to the side channel. The impeller generally recorded the highest loss coefficient of zeta(D') at 144 whiles the side channel recorded the lowest at zeta(D') < 6. The high entropy losses in the impeller domain are mainly associated with the irregular velocity fields. Furthermore, the losses visualized at the inner radius of the impeller are higher than the outer radius in all pump cases. The inner radius of all the impeller passage of all pump cases revealed higher loss coefficient (zeta(D') > 0.2) compared to the outer radius and decreased gently with increasing flows. Notwithstanding, the high losses produced in all pump cases, case 1 produced the highest energy losses compared with the other pump cases even though it had the best hydraulic performance. Thus, this study contributes to the fundamental knowledge of side channel pumps by providing the regions of high-energy losses for further optimization of the main geometrical parts especially the impeller. This will subsequently help improve the performance and operational reliability of side channel pumps and enhance its applications.