Combined thermoelectric conversion device

Abstract

The invention discloses a combined thermoelectric conversion device suitable for heat protection and heat utilization of a hypersonic flight vehicle and combined with thermoelectric conversion and Rankine thermoelectric conversion. A hot end of the thermoelectric conversion absorbs aerodynamic heat of the skin of the flight vehicle, a cold end of the thermoelectric conversion transfers heat to an evaporator of a Rankine thermoelectric conversion system capable of adopting R141b organic working media, and heat of a condenser of the Rankine thermoelectric conversion system is taken away by a vehicle-mounted cold source of the flight vehicle. By fully utilizing the aerodynamic heat on the surface of the hypersonic flight vehicle, on one hand, the temperature on the surface of the flight vehicle is reduced, and certain heat protection on the flight vehicle is achieved; on the other hand, the thermoelectric power generation technology with a wide temperature range is combined with Rankine cycle with low operation temperature, energy is made full use of, efficiency of energy use is increased, and the whole thermoelectric conversion efficiency of the system is increased.

Description

technical field [0001] The invention relates to a combined thermoelectric conversion device, which belongs to the technical field of aircraft thermal control. Background technique [0002] The Mach number of hypersonic aircraft is high, and the surface of the aircraft will generate high temperature due to the aerodynamic heating effect [1] . There is no report on the aerodynamic thermoelectric conversion technology, and the thermoelectric conversion technology in other fields can be divided into two categories: direct conversion and thermodynamic cycle. Direct conversion technology can realize the direct conversion of heat energy to electric energy, mainly semiconductor thermoelectric power generation technology [2] , Alkali metal thermoelectric conversion technology [3-4] and MHD technology [5] ; Circular thermoelectric conversion technology first converts thermal energy into mechanical energy through a thermodynamic cycle, and then drives a generator to generate electr...

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Problems solved by technology

[0003] However, each thermoelectric conversion technology has its own disadvantages: the development of semiconductor thermoelectric power generation technology is relatively mature, but the thermoelectric conversion efficiency is low (generally less than 10%); the core device BASE material in alkali metal thermoelectric technology has serious performance degradation and poor stability. The application is not yet mature; the magnetic fluid technology requires a huge superconducting magnet, which is not suitable for application in aircraft; the Rankine cycle technology is relatively mature, but it is mainly suitable for environments with low temperatures (below 300°C); Brayton cycle and Stirling cycle Circulatory system components are complex

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