一种适用于CJ1000A航空发动机的颗粒物排放性能评估方法

An evaluation method of particulate matter emission performance for CJ1000A aeroengine

为有效预测评估航空发动机的颗粒物排放适航性,对国产CJ1000A航空发动机的颗粒物排放标准适用性进行了分析,基于航空发动机在起降过程中最大非挥发性颗粒物质量排放浓度与发烟指数之间的转换关系,提出了一种适用于国产CJ1000A航空发动机非挥发性颗粒物排放性能的等效评估方法。以额定推力与CJ1000A相似的CFM56-5B航空发动机为例,研究表明该等效评估方法所得的分析结果与实际审定结果一致,可以有效评估航空发动机的非挥发性颗粒物排放性能;同时,分析了该方法估算CFM56-5B航空发动机非挥发性颗粒物质量排放浓度的相对误差,结果表明有必要进一步提升该方法的整体鲁棒性。总体上,提出的等效评估方法可为CJ1000A航空发动机的非挥发性颗粒物排放性能分析提供参考依据。

To effectively predict and evaluate the airworthiness of aero-engine particulate matter emission performance,we firstly analyze the applicability of particulate matter emission standard for domestic CJ1000A aeroengine in the paper,and use the conversion relationship between aeroengine maximum non-volatile Particulate Matter(nvPM)mass emission concentration and smoke number during the landing and take-off cycle to establish an equivalent evaluation method for domestic CJ1000A aeroengine nvPM emission performance.After that,an example of CFM56-5B aeroengine with a similar rated thrust to CJ1000A is used to verify the effectiveness of this evaluation method in predicting engine nvPM emission performance.Results show that the characteristic level of engine maximum nvPM emission mass concentration calculated by the equivalent evaluation method is in good agreement with the relevant correlation value given by ICAO EEDB,and the evaluation result of engine nvPM emission performance predicted by the equivalent evaluation method is consistent with the actual certification result.In addition,we analyze the relative error of predicted CFM56-5B aeroengine nvPM mass emission concentration calculated by the method,and the relevant path to further improve the overall robustness of the method is proposed.Results show that there are different errors in calculating the maximum nvPM emission mass concentrations of CFM56-5B aeroengines with different identification numbers,in which the relative errors for CFM56-5B1/3,CFM56-52B2/3 and CFM56-5B3/3 are all less than 10%,and the relative errors of CFM56-5B aeroengines with other identification numbers are all larger than 20%.Therefore,it is necessary to further establish the improved conversion relationship between the nvPM emission mass concentration and smoke number for CFM56-5B aeroengine,which is of great significance to improve the overall robustness of the evaluation method.However,the relative errors mentioned above do not influence the actual evaluation results of relevant engine nvPM emission performance.In general,the equivalent evaluation method proposed in this paper can provide important references for the analysis of CJ1000A aeroengine nvPM emission performance.