以我国某新研民用涡轴发动机为验证平台，自主开展了结冰适航试验研究；攻克了结冰喷雾系统研制、云雾场模拟等技术难题，利用新建的结冰试车台，完成了结冰包线工况点的结冰试验，揭示了进气系统结冰形成机理，获得了发动机进气系统结冰形貌，分析了飞行环境条件对结冰形貌的影响，总结了进气系统总压损失、压气机效率、燃气涡轮出口温度等参数变化规律。试验结果表明，发动机结冰主要出现在进气网罩，结冰类型主要表现为明冰和霜冰；结冰形貌多样，霜冰覆盖范围较大，最大结冰厚度可达260 mm，出现在温度-10 ℃、高度1.2 km、风速280 km/h结冰工况。进气系统结冰对发动机性能有较大影响，在温度-30 ℃、高度6 km、风速280 km/h结冰条件下，发动机结冰造成的进气总压损失系数高达13.3%，压气机效率值下降7.8个百分点，燃气涡轮出口的燃气温度升高41 ℃，功率损失达15.8%。结冰试验全过程中发动机未出现喘振、熄火等异常现象，充分验证了发动机在恶劣结冰气象条件下稳定可靠的工作能力。

A newly developed civil turbo-shaft engine was taken as a verification platform to do icing airworthiness test research independently; Technical problems such as development of icing spray system and simulation of cloud spray flowfield were overcome, icing tests in the icing envelope conditions were completed by using newly constructed icing test bench, the icing form mechanism of the intake system was revealed, the icing morphology of the engine intake system was obtained, the impact of the flight environment on icing morphology was analyzed, the changing rules of total pressure loss, compressor efficiency, turbine gas temperature and the other parameters were summarized. The test results show that engine icing mainly occurs in the intake mesh cover, and the icing type is mainly manifested as glaze ice and rime ice; There are various forms of ice morphology, and the rime ice covers a large range, with the maximum icing thickness up to 260mm which appears in icing condition at temperature -10 ℃, altitude 1.2 km, velocity 280 km/h. Icing has a significant impact on engine performance. Due to icing, the total intake pressure loss coefficient of the engine reaches up to 13.3％，the compressor efficiency value decreases by up to 7.8 percentage points, the gas temperature at gas turbine outlet increases by 41℃ and the engine power decreases by 15.8％ under temperature -30 ℃, altitude 6 km, velocity 280 km/h icing condition. During the icing test, the engine does not show any abnormal phenomena such as stalling or flame-out, which fully verifies the stable and reliable working capability of the engine under the adverse icing weather conditions.