Journal of Jilin University(Engineering and Technology Edition) ›› 2024, Vol. 54 ›› Issue (9): 2460-2468.doi: 10.13229/j.cnki.jdxbgxb.20221503

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Ground⁃based experiments of measuring flame speed for combustion science rack aboard china space station

Yu FANG1,2(),De-qing MEI3,Hui-long ZHENG1,Xiao-fang YANG1,Hai-long WU4,Xiao-wu ZHANG1   

  1. 1.Institute of Engineering Thermophysics，Chinese Academy of Sciences，Beijing 100190，China
    2.School of Engineering Science，University of Chinese Academy of Sciences，Beijing 100049，China
    3.School of Automotive and Traffic Engineering，Jiangsu University，Zhenjiang 212013，China
    4.School of Energy and Environment，Shenyang Aerospace University，Shengyang 110136，China
  • Received:2022-11-24 Online:2024-09-01 Published:2024-10-28

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Abstract:

Based on the Bunsen flame method and digital image processing technology， the ground-based experiments for measuring the flame speed of methane and ethylene were carried out using combustion science rack aboard china space station， to provide ground data for future comparison of space-ground （microgravity-normal gravity） combustion experiments， and to lay the foundation for the on-orbit combustion scientific research of Combustion Science Rack. According to the results， as the equivalence ratio increased， the flame speed increased first and then decreased， but the flame height decreased first and then increased， both of which reached their maximum or minimum value at around the equivalent ratio of 1.04. The maximum flame speed of methane premixed combustion was approximately 37.36 cm/s， while that of ethylene premixed combustion was approximately 67.58 cm/s， with the latter being about 1.81 times higher than the former. As the equivalence ratio was constant， the variation of outlet flow rates and Reynolds number of unburn air-fuel mixture gave a noticeable change in flame height but did not affect the flame speed.

Key words: power machinery and engineering, combustion science rack, flame speed, Bunsen flame, image processing

CLC Number: 

  • V419/TK16

Fig.1

Location of optical diagnostic equipment"

Table 1

Principal parameters of optical diagnosis equipment"

参数数值
最大分辨率1 296×1 024
最大帧率（全分辨率）/（f·s-1）3 096
曝光时间/μs1.5~40 000
光谱范围/nm290~1 100
感光度/ISO160~6400

Fig.2

External mass supply system"

Fig.3

Structure of Bunsen flame"

Fig.4

Pre-processing of flame image"

Fig.5

Detection and optimization of flame edge"

Fig.6

Linear fitting of flame edge"

Fig.7

Detection of flame edge"

Fig.8

Polynomial fitting of flame edge"

Fig.9

Comparison of results calculated by flame area method and flame cone angle method"

Fig.10

Comparison of results from this paper and other references"

Table 2

Experimental schemes of methane and ethylene premixed combustion at different equivalent ratios"

工况当量比ΦCH4流量/（L·min-1）

空气流量/

（L·min-1）

工况当量比ΦC2H4流量/（L·min-1）

空气流量/

（L·min-1）

10.800.4995.940230.720.2995.940
20.840.5245.940240.760.3165.940
30.880.5495.940250.800.3335.940
???5.940???5.940
201.560.9735.940441.560.6495.940
211.600.9985.940451.600.6665.940
221.641.0235.940461.640.6825.940

Fig.11

Flame images of methane and ethylene at different equivalent ratios"

Fig.12

Flame speed and height of methane and ethylene at different equivalent ratios"

Table 3

Experimental schemes of methane premixed combustion at different flow rates"

工况当量比ΦCH4流量/（L·min-1）空气流量Qair/（L·min-1）出口流量/（L·min-1）
10.840.4194.7525.171
20.5245.9406.464
30.6297.1287.757
41.000.4994.7525.251
50.6245.9406.564
60.7497.1287.877
71.160.5794.7525.331
80.7245.9406.664
90.8697.1287.997
101.320.6594.7525.411
110.8245.9406.764
120.9887.1288.116

Fig.13

Flame images of methane at different flow rates"

Fig.14

Flame speed and height of methane at different flow rates"

Table 4

Experimental schemes of methane premixed combustion at different Reynolds number"

工况当量比ΦCH4流量/（L·min-1）空气流量/（L·min-1）燃烧器喷口直径d/mm雷诺数Re
11.040.6495.94010961
271 373
31.120.6995.94010965
471379
51.200.7495.94010970
671 385
71.280.7995.94010974
871 391

Fig.15

Flame images of methane at different Reynolds number"

Fig.16

Flame speed and height of methane at different Reynolds number"

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