The absorptance of metals is often low within the visible and near-infrared band at room temperature. Increasing the absorption of metals plays a vital role in reducing energy consumption and production cost. After irradiation by 10 ns linearly polarized pulses with fluence close to the zero-probability damage threshold, the surface of 45# steel samples exhibited four kinds of surface structures in the spot area. The samples’ absorptance is improved by 38% when a high-quality laser-induced surface structure (LIPSS) appears at the spot centre. With the increase of the number of pulses, LIPSS begin to melt down, which will decrease the surface absorptance due to the appearance of damage stripes. The relative absorptance of samples was measured by an integrating sphere system. The paper reports detailed experiments to show that LIPSS can improve samples’ absorptance significantly.

In order to investigate the influence of plasma combustion on the performance of aeroengine combustor, a local geometric model of the two-head sector section of the short combustor was established. The steady-state numerical calculation of the kerosene in the combustor was carried out under the conventional mechanism and the specific operating condition under the plasma mechanism. The numerical calculation results of the combustor with or without the plasma mechanism were compared and analyzed. The results show that the average temperature, flow field velocity, density and turbulent kinetic energy behind the cyclone in the two-head fan section of the combustion chamber are better than those under the conventional mechanism, which indicates that the application of plasma mechanism can significantly improve the combustion performance of the combustion chamber to a certain extent. Under the chemical proper ratio, the average temperature of the outlet section of the combustion chamber increases from 1910 K to 2050 K, and the combustion efficiency increases from 82.4% to 90.1% by 7.7%, indicating that the addition of plasma mechanism can deepen the chemical reaction degree of kerosene and release more heat to improve the combustion efficiency of kerosene.