射流预冷装置温降与流阻特性试验研究

摘要

为了满足基于某型传统涡轮发动机射流预冷技术验证的需求,以射流预冷装置的温降和流阻特性研究为基础,设计了1种高效蒸发、低流阻的射流预冷装置,搭建了国内首套基于全尺寸的地面模拟试验系统,通过试验验证的方法研究了喷入介质的流量变化和进气温度变化对温降和流阻特性的影响,验证了射流预冷技术的有效性.结果表明:发动机入口来流温度不变时,射流预冷装置的温降特性主要取决于喷入介质的流量变化;随着来流温度的升高,射流预冷装置的介质蒸发率提高,来流降温量也会随之增大;通过调节喷射介质的流量,可将发动机风扇前气流温度维持在80~120 ℃;流阻特性主要取决于射流预冷装置自身,而介质喷射对流阻特性几乎不产生影响;射流预冷装置的总压损失小于4%,且随着来流温度的升高,总压损失有所减小.%In order to meet the demand for the verification of the Mass Injection Pre-Compressor Cooling (MIPCC) based on a traditional turbine engine,a kind of MIPCC device with high efficiency evaporation and low flow resistance was designed,and a set of test system was built based on the study of characteristics of temperature drop and flow resistance.The effects of medium flow rate variation and inlet temperature variation on the characteristics of temperature drop and flow resistance were studied respectively,and the effectiveness of the MIPCC was verified. The results show that the characteristics of temperature drop of MIPCC device lie on the medium flow rate variation,while the inlet temperature steadiness,the evaporation efficiency and the temperature drop of MIPCC increase with the increase of the inlet temperature.The inlet temperature in front of the fan could be maintained within the range of 80~120℃by adjusting the flow rate of medium injection. The flow resistance was mainly caused by the MIPCC device rather than the injection, however, the medium jet influences hardly on flow resistance characteristics. The total pressure loss of MIPCC decrease with the increase of the inlet temperature, and total pressure loss of MIPCC was less than 4%.