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中国航空科学基金(2008ZB52013)

作品数:4 被引量:39H指数:4
相关作者:金义何小民蒋波丁国玉吴泽俊更多>>
相关机构:南京航空航天大学更多>>
发文基金:中国航空科学基金江苏省普通高校研究生科研创新计划项目更多>>
相关领域:航空宇航科学技术交通运输工程机械工程化学工程更多>>

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超声波/离心组合喷嘴性能研究被引量:6
2012年
采用试验研究方法初步探索了一种超声波/离心组合喷嘴应用于航空发动机燃烧室的可行性.对该组合喷嘴开展冷态试验,得到了其流量特性和雾化特性(包括油雾索太尔平均直径(SMD)和雾化锥角),设计加工了横截面尺寸为117mm×60mm的单头部矩形燃烧室模型,并在不同进口条件下开展了相关的燃烧性能试验.结果表明:在冷态情况下,喷嘴流量特性符合传统离心喷嘴的流量特性,流量与供油压差呈二次函数关系;喷嘴雾化细度较好,无气状态下,油雾SMD在38~45μm之间变化,在满足产生超声波要求的气压条件范围内油雾SMD在8~12μm之间变化;喷雾锥角主要受供气条件影响,供油压力对喷雾锥角基本无影响;装有该喷嘴的模型燃烧室在所有试验工况下均可以稳定燃烧,燃烧效率最高达到99%.
金义何小民吴泽俊丁国玉秦伟林
关键词:航空发动机雾化特性燃烧性能可行性
富油燃烧/快速淬熄/贫油燃烧(RQL)工作模式下驻涡燃烧室排放性能试验被引量:23
2011年
针对使用液态燃料(航空煤油)的富油燃烧/快速淬熄/贫油燃烧(RQL)工作模式驻涡燃烧室排放性能开展了系统的试验研究,分析总结了驻涡区余气系数、进口空气流量和进口空气温度等参数影响RQL工作模式驻涡燃烧室排放性能的变化规律.结果表明:随着驻涡区余气系数增大(α=0.61~1.53),CO和UHC(未燃碳氢化合物)体积分数升高,NOx体积分数降低;随着进口空气流量增大(Wa=0.4~0.6 kg/s),CO,UHC,NOx体积分数均升高;随着进口空气温度升高(283~473 K),CO和UHC体积分数降低,NOx体积分数升高.
金义何小民蒋波
关键词:驻涡燃烧室液态燃料排放性能
Experimental Study on Emission Performance of an LPP/TVC被引量:17
2012年
A key issue in the commercial aircraft engine design is environmental acceptability, and designers are continually challenged to reduce emissions. In this paper, an experimental investigation is performed to evaluate the emission performance of a liquid-fueled trapped vortex combustor (TVC) under lean premixed prevaporized (LPP) mode. When operating as an LPP system, a TVC is fueled both in the cavities and in the main stream. The correlations between the emission performance and the total ex- cess air ratio, the positions (4 positions) of the fuel injectors in the main stream, and the inlet temperature are obtained. Experimental results show that both the volume concentrations of unburnt hydrocarbon (UHC) and NOv (NO, NOxusually grouped together as NOx) increase with the increase of total excess air ratio from 1.5 to 3.0; the emission performance relies heavily on the position of the main stream injector, and the best perfomlance is achieved at Position 4 in the experiments, the increase of the inlet temperature impacts on the emission performance positively: the smallest volume concentrations of UHC and NO,. obtained in the experiment are 94×10^-6 and 2.3× 10 ^-6 respectively. This paper validates the feasibility of low emissions for an LPP/TVC and provides a reference for further optimization of TVCs.
JIN YiHE XiaominZHANG JingyuJIANG BoWU Zejun
关键词:COMBUSTION
Design and Performance of an Improved Trapped Vortex Combustor被引量:8
2012年
A trapped vortex combustor (TVC) has been a very promising novel concept for it offers improvements in lean blow out, altitude relight, operating range, as well as a potential to decrease NOx emissions compared to conventional combustors. The present paper discusses the improved designs of the new combustor over the prior ones of our research group, including that:a) the over-all dimensions, both axial and radial, are reduced to those of an actual aero-engine combustor; b) the air flow distribution is optimized, and especially 15% of the air is fed into the liner as cooling air; c) a straight-wall diffuser with divergence angle 9°is added. A series of experiments (cavity-fueled only, under atmospheric pressure) has been conducted to investigate the performance of the improved TVC. Experimental results show that at the inlet temperature of 523 K, the inlet pressure of 0.1 MPa, stable operation of the TVC test rig is observed for the Mach number 0.15-0.34, indicating good flame stability; the combustion efficiency obtained in this paper falls into the range of 60%-96%; as the total excess air ratio increases, the combustion efficiency decreases, while the increase of the inlet temperature is beneficial to high combustion efficiency; besides, the optimal Mach numbers for high combustion efficiency under different inlet conditions are confirmed. The outlet temperature profiles feature a bottom in the midheight of the exit. This paper demonstrates the feasibility for the TVC to be applied to a realistic aero-engine preliminarily and provides reference for TVC design.
JIN Yi HE Xiaomin JIANG Bo WU Zejun DING Guoyu
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