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Coking properties of aircraft engines- nozzles
Huang Yanfei, Zhu Yuelin, Xiong Changjian, Pan Yingjie*
School of Materials Science and Engineering, Beijing University of Aeronautics and Astronautics, Beijing 100191, China

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Abstract�� In order to solve the problem of air safety and service lives of the aircrafts with a mass of coking, the properties and micro-morphologies of coking which generated on aircrafts engines- nozzles when aircraft fuel combusted were researched. The properties of coking were characterized by the techniques of scanning electron microscopy(SEM), transmission electron microscopy(TEM), energy disperse spectroscopy(EDS) and X-ray diffraction(XRD). It is found that two coking morphologies are produced: one is filamentous coking, and the other is granular coking. On the one hand, the filamentous coking only appears on the smooth surface of machine parts which includes short fiber filamentous coking and amorphous filamentous coking. It is generated by metal catalysis reaction and its formation has close connection with machine parts- structures, materials and surface. On the other hand, the granular coking, including aggregative granular coking and dispersive granular coking, mainly emerges on the surface of nozzles- pistons and it is aroused by the interaction of catalytic reaction and thermal cracking.
Keywords�� aircraft engines   nozzles   coking     
Received 2010-03-24;
Fund:

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About author: �����(1986-),Ů,ɽ��������,˶ʿ��,huangyanfei123@126.com.
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�����, ������, �ܳ���, ��Ӣ��.���շ���������ό��̼������[J]  �������պ����ѧѧ��, 2011,V37(6): 753-756
Huang Yanfei, Zhu Yuelin, Xiong Changjian, Pan Yingjie.Coking properties of aircraft engines- nozzles[J]  JOURNAL OF BEIJING UNIVERSITY OF AERONAUTICS AND A, 2011,V37(6): 753-756
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