航空发动机极端条件下液雾自燃特性研究进展

贫油预混预蒸发（LPP）燃烧是目前最先进的民用航空发动机低排放燃烧技术，但在预混过程中面临的自燃与回火等风险，已成为制约其发展的瓶颈问题。在航空发动机燃烧室的高温（最高1000K）、高压（最高6MPa）来流极端条件下，预混预蒸发段内自燃属于受限空间内的液雾自燃，本文对与液雾自燃相关的实验研究进行回顾和分析。首先，描述民用航空发动机LPP燃烧室内的液雾自燃过程，分析液雾自燃的影响因素和特点，指出液雾自燃的重点研究方向；其次，对与液雾自燃密切相关的化学自燃研究进行简要综述，总结各物理参数对化学自燃的影响规律；最后，重点分析液雾自燃的实验研究现状，展示航空发动机极端条件下的液雾自燃随机性研究进展，探讨液雾自燃研究面临的问题和后续发展趋势。

Progress on spray autoignition under the extreme conditions in aero-engines

The lean premixed prevaporized (LPP) combustion is the most advanced low emission combustion technology of civil aero-engines. However, the LPP technology faces the risks of autoignition and flashback during the premixing process, which becomes the bottle-neck restricting the development of LPP technology. Under the extreme inlet conditions of high temperature (up to 1000K) and high pressure (up to 6MPa) in the aero-engine combustor, the autoignition in premixed and prevaporised section is a liquid fuel spray autoignition process in confinement. This paper reviews and analyzes the experimental research on the spray autoignition. Firstly, the spray autoignition process in the LPP combustor of civil aero-engine is described, the influencing factors and characteristics of spray autoignition are analyzed, and the key research directions are pointed out. Secondly, the study on the chemical autoignition is briefly reviewed and the effects of parameters on chemical autoignition are summarized. Finally, the experimental research status of spray autoigniton is analyzed, the research progress of autoigniton randomness under the extreme conditions in aero-engines is demonstrated, and the issues and subsequent developments are discussed.