Thermal Analysis Of Slow Wave Structure Of Helix Traveling Wave Tube

Traveling wave tube(TWT) as the application of the current military equipment is the more common pieces of microwave power amplifier with high power, wide-band, high-gain, multi-mode operation and other characteristics. It is widely used in electronic warfare, radar, communications and other fields. Due to the continuous improvement of the performance of military equipment, make TWT for continuous development of wide-band frequencies, and the demand for flexibility, also makes the miniaturization of TWT research is extremely important. Broadband, high-power and miniaturization will lead to higher thermal-loads, thus affecting the life and reliability of the TWT, therefore the thermal performance analysis of TWT has its significance.This paper is based on the heat transfer theory, through theoretical analysis and simulation software analysis thermal deformation and high frequency characteristics of slow wave structure of TWT, finally designed a helix structure with improved heat dissipation capability. The main work of this paper is:1. The research on thermal properties and high-frequency characteristics of slow-wave structure,comprising: the first-law of thermodynamics,the basic principles of heat transfer, thermal contact resistance, heat generation and transfer, high-frequency characteristics of slow-wave structure, finite element theory and software of ANSYS.2. Analysis of deformation and heat of sector holding structure. Based on thermodynamic, integrating finite element(FEM) theory, analysis the slow-wave structure with the use of simulation software ANSYS, the simulation results are shown in the form of temperature distribution. Then use the heat- structure coupling module of ANSYS, the results of the simulation as heat load, effecting on structural unit, analyzing its deformation, getting the displacement deformation at high temperatures. When thermal analysis: focus on the problem of contact thermal resistance, analyzed and compared two different thermalmethods.When deformation analysis, the SWS calculation-software of MTSS is used to calculate the high frequency parameters, confirmed the influence by thermal deformation.3. The design and optimization of high thermal slow-wave structure. Respectively, from the two aspects of reducing heat production and heat dissipation to consider, starting from the holding assembly, shape, fins, surface coating four angles, using ANSYS simulate for the same type of TWT, integrated cooling capacity and two high-frequency characteristics, designed a slow-wave structure with cooling capacity greatly improved, and study deformation when it is at high temperatures. among them: when the helix surface coating research, considering the impact of high-frequency characteristics from the coating material, only film mulching treatment of the second half where heat is more concentrated; for the new designed Ring-T type holding structure through of thermal analysis results and theory of TWT, using MTSS calculate the dispersion characteristics,and coupling impedance, comparing the effects of different size on the high-frequency parameters, then determined the specific dimensions of each component, and analysis deformation of the new holding structure.