Design method of low-heat-sink high-temperature fuel gas channel

Abstract

The invention discloses a design method of a low-heat-sink high-temperature fuel gas channel. The design method specifically comprises the steps that the minimum heat flux density needing to be conducted at each position of the high-temperature fuel gas channel along the way is obtained; the value range of the actual heat flux density needing to be conducted at each position of the high-temperature fuel gas channel along the way is determined based on the minimum heat flux density; matching design is carried out on the number, groove widths and groove heights of cooling grooves based on the flow of a coolant, and a heat transfer coefficient of the cooling structure is obtained; the heat conduction resistance of the channel wall is obtained based on the actual heat flux density needing to be conducted at each position of the high-temperature fuel gas channel along the way and the heat transfer coefficient of the cooling structure; and design parameter values are selected to adapt to the heat conduction resistance of the channel wall, and the size parameters comprise the number of layers of annular cavities, the thickness of each wall face, the height of each annular cavity and the distance length between adjacent supporting ribs in each annular cavity. The specific size of the channel wall is optimally designed, and the working medium heat sink consumed by the high-temperature fluid channel is minimum on the premise of ensuring safe working.

Description

technical field [0001] The invention relates to the technical field of high-temperature gas channel design, in particular to a low-heat-sink high-temperature gas channel design method. Background technique [0002] In the application process of high-temperature gas channels, considering the high-temperature resistance strength of channel wall materials, the wall surface of high-temperature gas channels generally has an upper working temperature limit. The inner wall temperature works below the usable limit temperature of the material. [0003] The commonly used heat dissipation scheme that can work for a long time is generally an active cooling scheme. Specifically, a cooling medium is used to flow through the flow channel reasonably set inside the wall surface, and the heat that exceeds the safe working range of the inner wall of the gas channel is taken away in time. The temperature of the inner wall of the channel is kept below the limit working temperature, and the temp...

AI Technical Summary

Problems solved by technology

In this case, the above active cooling scheme is adopted. When the cooling flow rate, allowable temperature rise, area, etc. are insufficient, the cooling capacity of the coolant is insufficient, which will lead to overheating of the inner wall of the gas channel and cooling failure.

However, if the quality of the cooling medium is increased, the allowable temperature rise, and the cooling area are too large, it will lead to too much heat flow, consume too much heat sink of the working medium, and cause energy waste.

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