基于正交实验设计的螺旋通道变流器水动力性能数值分析

Numerical Analysis of Hydrodynamic Performance of Helical Channel Converter Based on Orthogonal Experimental Design

关键词:  正交实验设计  螺旋通道  磁流体推进器  变流器  CFD

Key words:  Orthogonal experimental design  Helical channel  MHD thruster  Converter  CFD

摘要:

变流器是螺旋通道磁流体推进器推进通道中重要的水力部件之一，变流器的设计影响着推进器的水力性能进而影响其推进性能。为探究变流器结构参数对螺旋通道水动力性能的影响，提出了基于四阶贝塞尔曲线的螺旋通道变流器三维建模方法，明确了变流器的结构参数；采用正交实验设计方法，选用五因素四水平正交设计表基于CFD方法分析了变流器结构参数对螺旋通道水动力学性能的影响及其变化规律。分析结果表明：螺旋通道导流器会大幅减小水力损失，相较于无导流器的结构通道水力损失系数最大减小了33.87%；整流器会提高通道的整流效果，但同时也会使水力损失增加，相较于无整流器的结构通道整流系数最大提高了180.06%，水力损失系数最小增加了13.79%。

Abstract:

The converter is one of the important hydraulic components in the propulsion channel of the helical channel magneto-hydrodynamic（MHD） thruster. The design of converter affects the hydraulic performance of thruster， and then affects its propulsion performance. In order to explore the effects of converter structure parameters on the hydrodynamic performance of helical channel， a three-dimensional modeling method of the helical channel converter based on the fourth-order Bessel curve was proposed. The structural parameters of the converter were defined. Based on CFD method， the orthogonal experimental design method was used， and the effects of structural parameters of the converter on the hydrodynamic performance of helical channel and its variation law were analyzed by using orthogonal design table with five factors and four levels. The results show that the inlet flow-guide of helical channel can reduce the hydraulic loss greatly. Compared with the structure without the inlet flow-guide， the maximum hydraulic loss coefficient of the channel is reduced by 33.87%. The rectifier can improve the rectification effect of the channel， but also increase the hydraulic loss. Compared with the structure without rectifier， the maximum rectification coefficient of the channel increased by 180.06%， and the minimum hydraulic loss coefficient increased by 13.79%.