Study on local heat transfer enhancement technique for high pressure chamber

Paper number

IAC-06-C4.P.3.06

Author

Prof. Jianhua Chen, Academy of Propulsion Technology, China

Coauthor

Mr. Guitian Zhang, Academy of Propulsion Technology, China

Year

2006

Abstract

Although the increase of velocity in the regeneratively cooling channels can enhance heat transfer to protect the wall of the thrust chamber, which operating under the conditions of high temperature, high pressure and with large heat flux by using kerosene as coolant, it may result in resistance characteristics deteriorated seriously. However, the artificial roughness (AR) set in cooling channels properly will be of advantage not only to fit the resistance characteristics but to enhance local heat transfer and to prevent the coke’s production. 
The mechanism AR and factors of influence on enhanced heat transfer in chamber cooling channels have been analyzed. The results of numerical simulation with or without AR in straight cooling channels are compared and the effect of AR on improved heat transfer, as an example for a specific thrust chamber, has been estimated. It is shown that the average temperature drop of the gas-side is about 43 degrees with AR in the throat area. Therefore, reasonable use of AR is of advantage to heat protection for high pressure thrust chambers of reusable engine.
Compared with the process of flow and heat transfer with or without AR for the farther understanding of the mechanism of heat enhancement, the validation of numerical models has also determined by the experimental results of AR resistance characteristics as while.  In additional, the numerical analysis with various structure parameters of AR indicates that parameters such as the height and space height ratio have significant effect on flow and heat transfer. The results show that the AR can make the temperature distribution at the outlet section more uniform, which will be of a good advantage for cooling performance of chamber with high pressure using kerosene as coolant under the same other conditions. Thus, the AR is a prospective technique to enhance the local heat transfer for high pressure rocket engine.

Abstract document

IAC-06-C4.P.3.06.pdf

Manuscript document

IAC-06-C4.P.3.06.pdf (🔒 authorized access only).

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