Abstract
The pump-jet propulsor(PJP) performances under various rotational speeds (20~50 r/s) are analyzed for further studying the influence of the Reynolds number (Re) on the hydrodynamics of PJP, before this, the calculation model is verified by using the experiment data, it proves the present numerical method is proper to make a further study. The results indicate both the hydrodynamic coefficients of PJP and PJP components and the contours with dimensionless variables are present high similarity, yet the Re has the slight effect on the components performance, among which, the force coefficient of rotor is the least affected, with a relative error no more than 1%. Followed is the force coefficient of rotor stator, the maximum error is 2.1%, since the force of duct and stator is so low that has the slight effect on PJP, the total force error is less than 2%. However, the torque coefficient error is bigger with a value of about 3%. Besides, it is found that all hydrodynamic coefficients vary monotonically with rotating speed, the higher Re caused by increasing the rotational speed will contribute to enhance the work ability of rotor, thus cause a lower pressure at vortex core, and change the trajectory of TLV.
Highlights
The pump⁃jet propulsor( PJP) performances under various rotational speeds (20 ~ 50 r / s) are analyzed for further studying the influence of the Reynolds number ( Re) on the hydrodynamics of PJP, before this, the cal⁃ culation model is verified by using the experiment data, it proves the present numerical method is proper to make a further study
The results indicate both the hydrodynamic coefficients of PJP and PJP components and the contours with dimensionless variables are present high similarity, yet the Re has the slight effect on the components perform⁃ ance, among which, the force coefficient of rotor is the least affected, with a relative error no more than 1%
Fol⁃ lowed is the force coefficient of rotor stator, the maximum error is 2.1%, since the force of duct and stator is so low that has the slight effect on PJP, the total force error is less than 2%
Summary
究院( 中船第 708 所) 提供,其原始几何模型如图 1 所示,定子和 转子叶片随边为钝边, 叶根部分别有 2 mm和 2.5 mm 半径的倒圆,为后续几何模型处理 及离散网格的方便,取消叶根倒圆,并将叶片随边处 理为圆角。 改型后的泵喷如图 1 所示,其中定子和 转子叶片数目为 6 和 8,转子的直径 Dr 为 166.4 mm, 间隙为 1 mm,大约为 0.6Dr,毂径比为 0.3,投影盘面 比为 0.8。 转子各半径处螺距比(P / D)如表 1 所示。 克罗内克函数, - ρ u′i u′j 是雷诺应力。 考虑到 k⁃ω 方 程对近壁区域、尾流和绕流计算效果比较好,以及对 观察图 8c)可以发现各性能系数偏差均随转速 呈单调性变化,综合来看, KTr 的相对偏差最小, 紧 随其后的是 KT 和 KTs ,其次是扭矩系数 KQr 和 KQs ,偏 差最大 的 为 KTd , 其相对偏差在 50 r / s时达到最大 14%。
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callMore From: Xibei Gongye Daxue Xuebao/Journal of Northwestern Polytechnical University
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
