船用吊舱推进器结构强度的研究
发布时间：2018-09-07 13:44
【摘要】：目前,国际造船界密切地关注着船舶能效设计指数(EEDI)标准的变化。船用推进器的设计需要更全面、更深入地考虑推进效率、空泡性能、船尾的脉冲压力、振动噪音、强度。设计出满足国际标准的新型船用推进器是迫在眉睫。国内船用推进器水动力性能研究方法的不断成熟,同时对特殊工况下推进器结构强度的研究也正在进行。在船用推进器中,由于调距桨和吊舱推进器各自的特点,两者都具有巨大的潜在市场。本文基于单向流固耦合理论的数值方法对调距桨桨叶和吊舱推进器吊舱进行结构强度计算。具体的研究内容如下:选择散货船的MAU4-54桨为研究对象,计算得到不同进速系数下的水动力性能,并与试验结果进行比较,两者比较吻合,同时对桨叶的压力场进行具体分析。再提取设计工况下的桨叶压力系数数据,利用TECPLOT软件将压力系数插值到实桨有限元节点上,再通过相似定律计算得到实桨桨叶水动力载荷。最后利用ANSYS结构静力分析软件对实桨水动力载荷、离心力载荷进行加载、求解和强度校核,并具体分析桨叶应力、应变,同时与CCS规范校核进行比较,两者结果一致。此方法验证基于单向流固耦合理论的桨叶结构强度校核数值计算方法是合理的。与规范校核方法相比,此方法提供了更全面的应力分布信息。用JDC3-65图谱进行船-机-桨匹配设计,分别得出调距桨在设计工况、设计螺距下的系柱工况、最大推力工况三种情况下的几何参数和转速和水动力性能。再利用CFD数值方法分别对三种工况下的压力分布进行计算和分析。再利用有限元法对三种工况下的桨叶强度进行计算和分析,同时与CCS规范校核进行比较,两者结果一致。结果表明:在设计工况下满足结构强度要求,而在设计螺距下的系柱工况和最大推力工况下不满足强度要求。利用基于单向流固耦合理论的数值计算方法校核吊舱。首先对不同进速系数和不同来流方向下的拖式吊舱推进器进行水动力性能数值计算,同时分析吊舱包表面的压力分布。再用有限元法对这两种工况进行强度计算,分析吊舱表面的应力、应变分布。结果表明:最大应力发生在支架上端和前、后端;在吊舱小角度转动时,吊舱推进器的应力、应变分布是相似的,大小没有明显变化。
[Abstract]:At present, the international shipbuilding industry is closely following the change of (EEDI) standard of ship energy efficiency design index. The design of marine propellers needs to be more comprehensive, more in-depth consideration of propulsion efficiency, cavitation performance, stern pulse pressure, vibration noise, intensity. It is urgent to design a new marine propeller that meets the international standards. At the same time, the research on the strength of propeller structure under special working conditions is also being carried out with the development of hydrodynamic performance research methods of marine propellers in China. In marine propeller, both of them have a huge potential market because of their respective characteristics of adjustable pitch propeller and podded propeller. Based on the unidirectional fluid-solid coupling theory, the structural strength of the adjustable pitch propeller blade and podded propeller pods is calculated. The specific research contents are as follows: the hydrodynamic performance of MAU4-54 propeller of bulk carrier is calculated and compared with the experimental results, and the pressure field of the blade is analyzed in detail. The pressure coefficient data of the blade under the design condition are extracted, and the pressure coefficient is interpolated to the finite element node of the real propeller by TECPLOT software, and the hydrodynamic load of the real propeller blade is calculated by the similarity law. Finally, ANSYS structural static analysis software is used to load, solve and check the strength of solid propeller hydrodynamic load and centrifugal force load. The stress and strain of blade are analyzed in detail, and the results are compared with those of CCS code. The results are in agreement with each other. This method verifies that the numerical calculation method of blade structure strength based on unidirectional fluid-solid coupling theory is reasonable. Compared with the standard checking method, this method provides more comprehensive information on stress distribution. The matching design of ship, engine and propeller is carried out by using JDC3-65 diagram. The geometric parameters, rotational speed and hydrodynamic performance of adjustable pitch propeller under design condition, mooring column condition under design pitch and maximum thrust condition are obtained respectively. Then the pressure distribution under three conditions is calculated and analyzed by CFD numerical method. The finite element method is used to calculate and analyze the blade strength under three working conditions, and the results are compared with the CCS code. The results are in good agreement with each other. The results show that the structural strength requirements are satisfied under the design condition, but not under the mooring column condition and the maximum thrust condition under the design pitch. A numerical method based on unidirectional fluid-solid coupling theory is used to check the pods. Firstly, the hydrodynamic performance of towed podded thrusters with different feed coefficients and different flow directions are calculated, and the pressure distribution on the surface of the pods is analyzed. The finite element method is used to calculate the strength of the two working conditions, and the stress and strain distribution on the surface of the pod is analyzed. The results show that the maximum stress occurs at the upper end, front end and back end of the support, and the stress and strain distribution of the podded propeller is similar when the pod is rotated at a small angle, but the magnitude does not change obviously.
【学位授予单位】：江苏科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U664.3
本文编号：2228429
[Abstract]:At present, the international shipbuilding industry is closely following the change of (EEDI) standard of ship energy efficiency design index. The design of marine propellers needs to be more comprehensive, more in-depth consideration of propulsion efficiency, cavitation performance, stern pulse pressure, vibration noise, intensity. It is urgent to design a new marine propeller that meets the international standards. At the same time, the research on the strength of propeller structure under special working conditions is also being carried out with the development of hydrodynamic performance research methods of marine propellers in China. In marine propeller, both of them have a huge potential market because of their respective characteristics of adjustable pitch propeller and podded propeller. Based on the unidirectional fluid-solid coupling theory, the structural strength of the adjustable pitch propeller blade and podded propeller pods is calculated. The specific research contents are as follows: the hydrodynamic performance of MAU4-54 propeller of bulk carrier is calculated and compared with the experimental results, and the pressure field of the blade is analyzed in detail. The pressure coefficient data of the blade under the design condition are extracted, and the pressure coefficient is interpolated to the finite element node of the real propeller by TECPLOT software, and the hydrodynamic load of the real propeller blade is calculated by the similarity law. Finally, ANSYS structural static analysis software is used to load, solve and check the strength of solid propeller hydrodynamic load and centrifugal force load. The stress and strain of blade are analyzed in detail, and the results are compared with those of CCS code. The results are in agreement with each other. This method verifies that the numerical calculation method of blade structure strength based on unidirectional fluid-solid coupling theory is reasonable. Compared with the standard checking method, this method provides more comprehensive information on stress distribution. The matching design of ship, engine and propeller is carried out by using JDC3-65 diagram. The geometric parameters, rotational speed and hydrodynamic performance of adjustable pitch propeller under design condition, mooring column condition under design pitch and maximum thrust condition are obtained respectively. Then the pressure distribution under three conditions is calculated and analyzed by CFD numerical method. The finite element method is used to calculate and analyze the blade strength under three working conditions, and the results are compared with the CCS code. The results are in good agreement with each other. The results show that the structural strength requirements are satisfied under the design condition, but not under the mooring column condition and the maximum thrust condition under the design pitch. A numerical method based on unidirectional fluid-solid coupling theory is used to check the pods. Firstly, the hydrodynamic performance of towed podded thrusters with different feed coefficients and different flow directions are calculated, and the pressure distribution on the surface of the pods is analyzed. The finite element method is used to calculate the strength of the two working conditions, and the stress and strain distribution on the surface of the pod is analyzed. The results show that the maximum stress occurs at the upper end, front end and back end of the support, and the stress and strain distribution of the podded propeller is similar when the pod is rotated at a small angle, but the magnitude does not change obviously.
【学位授予单位】：江苏科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U664.3
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