STUDY ON LOACAL HEAT TRANSFER ENHANCEMENT TECHNIQUE FOR HIGH PRESSURE CHAMBER

摘要

Although the increase of velocity in the regeneratively cooling channels can enhance the heat transfer to protect the wall of the thrust chamber, which operating under the conditions of high temperature and high pressure by using kerosene as coolant, it may results in deteriorating the chamber flow resistance characteristics seriously. The artificial roughness (AR) located in cooling channels properly may not only to fit the resistance characteristics but also to enhance local heat transfer. The mechanism of AR and its influence factors on enhanced heat transfer in chamber cooling channels have been analyzed. The results of numerical simulation with or without AR in the straight cooling channels are compared for the farther understanding of the mechanism of heat enhancement, and the effects 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 K decrease with AR located in the throat region. The validation of numerical models has also carried out by the experimental results of AR resistance characteristics. The results of the numerical simulation show that the AR can make the temperature distribution at the outlet cross section more uniform, which will be of an advantage for preventing the coke's formation of the chamber with high pressure using kerosene as coolant under the same other conditions.