Abstract: Argon power cycle engine is a new concept of zero-emission engine. With the aim of developing a more efficient injection strategy for argon power cycle engine, the injection characteristics of oxygen injected into argon-hydrogen mixtures with different concentration ratios are investigated using the constant volume combustion bomb. The characteristics of oxygen jet such as penetration distance, jet volume and entrainment rate are calculated and analyzed. The study results demonstrate that with the increase of the injection pressure the penetration length and entrainment rate of oxygen jet increase. The decrease of ambient pressure leads to an increase of jet volume, but it will have a negative impact on entrainment rate. The ratio of hydrogen in argon-hydrogen atmosphere has a significant impact on the penetration distance and entrainment rate, with higher hydrogen concentration bringing about rapid increase of penetration distance and higher entrainment rate

Key words: argon power cycle engine; oxygen injection; argon-hydrogen atmosphere