高温磁流体动密封结构散热特性分析与优化

针对某型高温磁流体动密封结构在工作时磁流体温度过高的问题，提出了在原有结构上增加冷却水道和隔热气孔的结构优化方案，以降低高温工作环境中的磁流体工作温度，使其工作温度在要求的工作范围内。通过对比该密封装置在结构优化前后两种热源温度下的温度场、压力场和速度场，进而分析该密封结构的散热特性及优化的可行性。分析结果表明，温度和结构的变化对压力场和速度场并无明显影响；增加散热水道和隔热气孔能有效降低整体结构温度。优化后，在热源温度为700 ℃或500 ℃时，磁流体域最高温度分别降低了173 ℃和95 ℃，均极大地降低了磁流体在工作时的温度。该结构优化方案可将磁流体的温度降低至正常工作范围，提高结构的使用寿命，并为磁流体密封结构的优化提供了一定的参考。

Analysis and Optimization of Heat Dissipation Characteristics of High Temperature Magneto Hydro Dynamic Seal Structure

In view of the problem of a high magnetic fluid temperature during operation of a certain type of high-temperature magnetic fluid in a high temperature MHD dynamic seal structure, a structural optimization scheme has thus been proposed to add cooling water channels and insulation air holes to the original structure, so as to reduce the working temperature of the magnetic fluid in the high-temperature working environment, thus ensuring a working temperature within the required working range. Based on a comparison between the temperature, pressure, and velocity fields of the sealing device under two different heat source temperatures before and after structural optimization, a further analysis has been made of the heat dissipation characteristics of the sealing structure and the feasibility of optimization. The analysis results indicate that changes in temperature and structure have no significant impact on the pressure and velocity fields, while adding heat dissipation channels and insulation pores helps to effectively reduce the temperature of the overall structure. After optimization, with the heat source temperature reaching as high as 700℃ or 500℃, the maximum temperature in the MHD domain decreases by 173℃ and 95℃ respectively, thus significantly reducing the temperature of the magnetic fluid during operation. This structural optimization plan can reduce the temperature of the magnetic fluid to the normal working range, and improve its service life, thus providing certain reference value for the optimization of the magnetic fluid sealing structure.