基于势流理论的螺旋桨效率-噪声样本分析方法

Efficiency-Noise Sample Analysis Method of Propeller Based on Potential Flow Theory

关键词:  收缩和加载叶尖螺旋桨  势流理论  噪声预报  变参数分析  优化设计

Key words:  Contracted and loaded tip propeller  Potential flow theory  Noise prediction  Variable parameter analysis  Optimal design

摘要:

为了提高效率、降低噪声，螺旋桨设计需要在精确的性能预报基础上，平衡不同参数对设计目标带来的影响。本文以面元法为主要手段预报CLT桨的水动力性能，并引入噪声模型进行噪声预报。整个过程以4叶CLT（Contracted and Loaded Tip）桨—P1727桨为母型桨，在螺距比为原桨螺距比0.9~1.2倍范围内，考虑3叶、4叶、5叶三种叶数形式，最终计算100个设计桨案例的水动力性能和噪声性能。设计桨最终满足某中型船的推力要求，并寻找螺旋桨最小叶尖涡流噪声-最大效率解集。计算结果表明，在固定推力值的情况下，螺旋桨叶数与噪声成反比趋势，效率与噪声性能受螺距比影响，并呈现出一定的规律性。对于高效桨P1727而言，改变螺距比与叶数会使效率与噪声存在一定的平衡范围，可以应对不同的设计要求。

Abstract:

In order to improve efficiency and reduce noise， propeller design needs to balance the influence of different parameters on design goals based on accurate performance predictions. This paper used the panel method as the main method to predict the hydrodynamic performance of the CLT（Contracted and Loaded Tip） propeller， and introduced a noise model for the noise prediction.In the whole process， the 4-blade CLT propeller—P1727 propeller is used as the female propeller. Within the range of the pitch ratio of 0.9 to 1.2 times of the original pitch ratio， three forms of blade number （3-blade，4-blade，5-blade） are considered， and the hydrodynamic performance and noise performance of 100 design propeller cases are calculated finally.The propeller is designed to meet the thrust requirements of a medium-sized ship， and to find the minimum blade tip vortex noise and maximum efficiency solution set of the propeller.The calculation results show that the number of propeller blades is inversely proportional to the noise， the efficiency and noise performance are affected by the pitch ratio and show a certain regularity， when the thrust value is fixed. For the high-efficiency propeller P1727， changes in the pitch ratio and the number of blades will result in a certain range of balance between efficiency and noise， which can cope with different design requirements.