In this section, you can access to the latest technical information related to the FUTURE project topic.

Swirling effect on thermodynamic performance in a solid fueled ramjet with paraffin-polyethylene

In this work, systematic firing tests have been conducted to evaluate the thermodynamic performances and combustion behaviors of Solid Fuel Ramjet (SFRJ) fueled by paraffin-polyethylene blends fuel. The experiments are carried out via connected pipe facility. And three key parameters are identified, i.e. 1) fuel paraffin concentration, 2) swirl intensity (denoted by swirling number), and 3) solid fuel ramjet combustor geometry. These parameters are experimentally investigated one at a time. To characterize the propulsion system performance, the static temperature, pressure, and engine thrust data are logged in real-time. The time-averaged regression rate is obtained via a three dimensional scanner. A high-speed camera is employed to capture the flame shapes. The acquired pressure data from the engine is further analyzed by using Fast Fourier Transform to obtain its frequency spectrum and acoustical energy distribution over the frequency range of interest. The present results show that increasing the swirl number can increase the regression rate, combustion efficiency, and total thrust. However, increasing the paraffin concentration has a positive effect on the regression rate, but negative effect on the combustion efficiency. In addition, the regression rate is found to be inversely proportional to the inlet diameter and port diameter. In general, the present work shed lights on the thermodynamic performances of a SFRJ fueled by paraffin-polyethylene blends.

» Author: Weixuan Li, Xiong Chen, Dan Zhao, Bin Wang, Kun Ma, Tao Cai

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