能量旁路组合发动机磁流体发电通道数值模拟

利用简化的一维低磁雷诺数下磁流体动力学方程组,对理想分段法拉第型MHD发电通道开展了数值模拟研究,分析了电磁参数和通道几何参数的变化对MHD发电通道性能的影响。结果表明:MHD发电通道能够有效减小出口气流速度,降低总温,并提取出能量,但由于电磁作用的不可逆效应以及焦耳热的产生总压有所损失。磁场强度B、电导率σ的大小,反映了通道内电磁作用强度。适度扩张型通道能够抑制出口气流速度、静温和总温,并增强电磁作用效果。要使通道出口速度减小,总温和总压降低,能量提取率增加,可以增大磁场强度B或电导率σ;反之则反向调节。

Numerical Simulation Investigation on MHD Power Generation Channel of Energy Bypass Combined Engine

With simplified one-dimensional low magnetic Reynolds number MHD equations,this paper involves study on the numerical simulation of ideal Faraday MHD power generation channel,analyzing influence that the change of electromagnetic parameters and channel geometry parameters have on the performance of MHD power generation channel.Results show that MHD power generation channel can reduce flow velocity and total temperature,and extract energy effectively.However,it can inflict losses upon total pressure because of electromagnetic irreversible and Joule heat effects.Increasing of magnetic field strength and electric conductivity means role in enhancing of electromagnetic.A reasonable expand channel can efficiently refrain from static temperature,flow velocity and total temperature at the exit,and get the favorable influencing factors of electromagnetic.Effect of decreasing in outlet velocity,total temperature as well as total pressure and increasing in extracting-energy-rate can be received by enhancing parameters such as magnetic field strength,electric conductivity.Otherwise,magnetic field strength and electric conductivity should be diminished.