Abstract
In order to study the regenerative cooling mechanism, a three-dimensional numerical method for supercritical heat transfer of hydrocarbon fuels was established based on the Navier-Stokes equations and a thermophysical properties evaluation code. The supercritical heat transfer behavior of n-decane inside an electrically heated tube and n-dodecane inside a fuel-cooled panel has been computed. Detailed distributions of outer wall temperature and fuel temperature were obtained. The corresponding measurements are adopted to validate the numerical method. The relative deviations of the computational outer wall temperature from the test results are within 6.8%, and those of the fuel temperature are within 1%. Those indicate that the numerical method is reliable, and can be used as an effective tool to investigate the supercritical heat transfer of hydrocarbon fuels.
Highlights
Supercritical heat transfer of hydrocarbon fuels plays a key role in the regenerative cooling process for scramjet (Palaszewski, Ianovski & Carrick, 1998; Huang, Spadaccini, & Sobel, 2004)
In order to study the regenerative cooling mechanism, a three-dimensional numerical method for supercritical heat transfer of hydrocarbon fuels was established based on the Navier-Stokes equations and a thermophysical properties evaluation code
The relative deviations of the computational outer wall temperature from the test results are within 6.8%, and those of the fuel temperature are within 1%
Summary
Supercritical heat transfer of hydrocarbon fuels plays a key role in the regenerative cooling process for scramjet (Palaszewski, Ianovski & Carrick, 1998; Huang, Spadaccini, & Sobel, 2004). In order to maintain engine reliability and lifetime, the fuel is firstly injected into the cooling channels in the wall panels and into the combustor. On this occasion, the combustor wall is cooled via the convective heat transfer of fuel, and the heat energy is reused. Heat transfer deterioration could occur once the fuel temperature reaches the pseudo-critical temperature (Hua, Wang, & Meng, 2010; Dang, Zhong, Chen, & Zhang, 2013). These studies show that detailed investigation of supercritical heat transfer of hydrocarbon fuels is needed. The electrically heated tube and fuel-cooled panel experiments were conducted to validate the numerical method
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