The effects of thermal radiation with/without TRI on performance of aero-engine combustors with varying geometric scales by preserving similarity of dynamics

Radiative heat transfer (RHT) and Turbulence-Radiation Interaction (TRI) are closely related with the performance of aero-engine combustors. The similarity of dynamics is preserved as the geometric scale changes at constant Reynolds number (Re), which may cause the effects of RHT with/without TRI on swirling flames to be different from that at constant Damkohler number. In this work, four cases with various geometric scales are constructed to investigate effects of RHT with/without TRI on flames of swirling combustors at constant Re. The results show that, when soot radiation is ignored, temperature drop at outlet caused by RHT without TRI increases as geometric scale is enlarged, while that caused by TRI increases first and then decreases. As soot radiation is included, the effect of RHT without TRI on mean temperature drop is enhanced, while that caused by TRI is weakened, and finally the mean temperature increases for large geometric scale when TRI is considered.