Improvement of aircraft classification method based on wake safety assessment

doi:10.16265/j.cnki.issn1003-3033.2022.07.1241

Abstract

Abstract:

In order to analyze the rationality of different aircraft classification methods and the safety of wake separation standards, a wake vortex safety assessment model was established based on the rapid simulation method, and the induced RMC was used as the assessment index of wake vortex severity. During approaching and landing phase wake safety of 10 heavy-sized aircraft and 36 medium-sized aircraft under different wake separation standards was calculated and analyzed. RECAT-NEW method was proposed base on reclassification of the medium-sized aircraft and the adjustment of wake separation standards. Results show that the RMC calculated by the ICAO and RECAT-EU methods is larger and the wake vortex severity more serious. The RECAT-CN and RECAT1.5 methods are relatively conservative in the classification of medium-sized aircraft, and there is a reduction space in the wake interval. The RECAT-NEW grouping method is 54% higher than ICAO and RECAT-EU methods in terms of safety margin, and the wake separation is 0.3 km shorter than RECAT-CN and RECAT1.5.

Key words: safety assessment, aircraft classification, induced rolling moment coefficient (RMC), wake vortex, wake interval

WEI Zhiqiang, LI Xiaochen. Improvement of aircraft classification method based on wake safety assessment[J]. China Safety Science Journal, 2022, 32(7): 70-76.

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后机机型	尾涡遭遇模拟数据	文中模型计算结果	相对误差/%
B753	0.04	0.039	-2.5
B738	0.043	0.041	-4.7
MD83	0.048	0.047	-2.1
A320	0.047	0.049	4.3
F100	0.053	0.052	-1.9
E145	0.062	0.06	-3.2

ICAO分组			我国现行RECAT-CN
MTOW/t	翼展/m	组别	MTOW/t	翼展/m	组别
≥136	>74.68	A	≥136	>75	J
≥136	>53.34 ≤74.68	B	≥136	>54 ≤75	B
≥136	>38.1 ≤53.34	C	≥136	≤54	C
>18.6	>32	D	7~136	—	M
	>27.43 ≤32	E
	<27.43	F
≤18.6	—	G	≤7	—	L

前机	RECAT-CN/ n mile	ICAO分组/ n mile			RECAT1.5/ n mile		RECAT-EU/ n mile
	后机	后机			后机		后机
	M	D	E	F	D	E	D	E
B	5	4	5	5	5	5	4	5
C	3.5	3	3.5	3.5	3.5	3.5	3	4

参数	机型
参数	B744	A346	B773	B772	A343	A333	A332	MD11	B763	A306
最大着陆质量/t	281.23	256.04	237.68	201.85	186.03	185.03	180.03	222.94	145.15	140
机翼面积/m²	541.16	436.99	427.81	427.81	361.6	361.6	361.6	338.91	283.35	260
翼展/m	64.92	63.42	60.92	60.92	60.32	60.32	60.32	51.66	47.58	44.84
梢根比	0.277 5	0.2	0.148 6	0.148 6	0.219 8	0.219 8	0.219 8	0.245 9	0.267 2	0.3
进近着陆速度/kn	145	141	141	130	132	133	132	151	138	131
RECAT-CN	B	B	B	B	B	B	B	C	C	C
ICAO分组	B	B	B	B	B	B	B	C	C	C
RECAT1.5	B	B	B	B	B	B	B	C	C	C
RECAT-EU	B	B	B	B	B	B	B	C	C	C

参数	机型
参数	A321	B722	B739	B738	A320	A319	MD83	…	E145
最大着陆重量/t	77.8	70.08	66.81	66.36	64.51	62.5	68.04	…	19.3
机翼面积/m²	122.4	157.94	125	125	122.4	122.4	112.32		51.19
翼展/m	33.92	32.92	34.32	34.32	33.92	34.12	32.89		20.03
梢根比	0.249 2	0.321 1	0.218 9	0.218 9	0.249 2	0.249 2	0.2		0.25
进近着陆速度/kn	131	125	137	135	116	113	135		129
RECAT-CN	M	M	M	M	M	M	M		M
ICAO分组	D	D	D	D	D	D	D		F
RECAT1.5	D	D	D	D	D	D	D		E
RECAT-EU	D	D	D	D	D	D	D		E