| Citation: | ZHANG S J，GE J H，MA Z，et al. Influence of gap between splitter plate and side wall on performance of TBCC exhaust system[J]. Journal of Beijing University of Aeronautics and Astronautics，2024，50（11）：3553-3565 （in Chinese） doi: 10.13700/j.bh.1001-5965.2022.0842
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In order to study the influence of the gap between splitter plate and side wall of a turbine-based combined cycle (TBCC) exhaust system on its performance, the numerical simulation method was used to analyze the influence of different gap lengths and widths on the performance parameters of the nozzle. Then, the influence of whether there was a gap between the turbine channel and the stamping channel under different working conditions on the nozzle performance was studied. The results show that when two channels of the nozzle are under-expanded, there is a gap between splitter plate and side wall. For the turbine channel with gas leakage, the thrust coefficient of the turbine channel decreases, and the lift increases with the increase in the gap length, while the thrust coefficient of the stamping channel has almost no change, but the lift increases. In addition, the influence of gap width change on nozzle performance is consistent with that of length. The research on different nozzle working conditions finds that the existence of gaps always reduces the thrust coefficient. When the relative width and length of the gap are 0.033 and 0.31, 2.8% of the gas leakage can cause more than 1% loss of the thrust coefficient.
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