背压对气液针栓单元喷雾分布特性的影响

doi:10.7527/S1000-6893.2023.28614

Abstract

Abstract:

The spray distribution characteristics of a radial-orifice gas-liquid pintle injector element were studied by experiments in different backpressure environments. A normal flow cold atomization experimental system which can provide stable backpressure in the range of 0.1-6.0 MPa and has multiple optical measurement windows was built. The atomization experiment was conducted by using filtered water and dry air instead of liquid oxygen and gas methane. The range of experimental backpressure was 0.1-1.5 MPa. The spray image of pintle injector element was obtained by using the background light imaging technology. The spray morphology and spatial distribution were studied by image processing.Results show that the spray formed by the gas-liquid pintle injector element in the backpressure environment was dense， and the spray boundary has obvious “turning” characteristic. According to the spray density distribution， the spray field is divided into three zones： spray core zone， spray boundary zone， and sparse spray zone. The influences of backpressure and local momentum ratio on radial spatial distribution range of spray are opposite. The smaller the backpressure is， the larger the local momentum ratio is， the larger the spray half angle is and the larger the envelope range of the windward boundary contour of spray is. In addition， compared with the spray half angle， the windward boundary contour of spray can better show the change of the spray spatial distribution range in the near field of the nozzle.

Key words: liquid rocket engine, gas-liquid pintle injector element, backpressure, spray morphology, spray distribution characteristic

CLC Number:

V434.3

Ziguang LI, Peng CHENG, Qinglian LI, Xiao BAI, Pengjin CAO. Influence of backpressure on spray distribution characteristics of a gas-liquid pintle injector element[J]. Acta Aeronautica et Astronautica Sinica, 2024, 45(2): 128614-128614.

Figures/Tables 16

Fig.1

Table 1

Fig.2

Fig.3

Table 2

Fig.4

Fig.5

Fig.6

Fig.7

Fig.8

Fig.9

Table 3

Existing formulas of spray half angle for radial-orifice pintle injector element

序号	作者	针栓类型与工质	类型	方程	备注
1	Cheng等（2017年）^［14］	径向孔（水）/轴向膜（水）	理论模型	$θ = a r c c o s 1 1 + L M R$
2	王凯等（2020年）^［33］	径向孔（水）/轴向膜（水）	半经验模型	$θ = a r c c o s 1 C 1 + C 2 · L M R$	C₁=0.75和C₂=1.25，用于表征液膜、射流变形程度
3	张波涛等（2021年）^［16］	径向孔（水）/轴向膜（气）	半经验模型	$θ = C 1 a r c t a n (2 · L M R)$	C₁=0.61，适用的LMR范围为0~3

Table 3

Fig.10

Fig.11

Fig.12

Fig.13

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结构参数	数值
气膜厚度H/mm	3.00
气膜宽度L/mm	7.00
跳过距离L_s/mm	9.00
中心通道壁厚T/mm	1.00
喷孔宽度W/mm	0.70
喷孔高度Y/mm	2.00
孔间间隔X/mm	1.63
阻塞比	0.30

序号	背压/MPa	气膜流量/（g·s^-1）	气膜速度/（m·s^-1）	射流流量/（g·s^-1）	射流速度/（m·s^-1）	LMR
1	0.50	66.20	315.90	81.60	19.46	0.253
2	0.52	51.20	315.90	89.20	21.27	0.391
3	0.50	32.80	284.00	83.80	19.98	0.599
4	0.52	33.10	278.00	94.50	22.54	0.771
5	0.52	33.50	280.00	102.70	24.50	0.894
6	0.52	33.50	280.00	113.50	27.10	1.091
7	1.04	63.90	271.40	79.80	19.03	0.291
8	1.00	45.30	218.00	79.30	18.92	0.506
9	0.97	39.30	202.00	82.70	19.72	0.684
10	1.01	41.50	198.30	89.50	21.35	0.773
11	0.98	39.80	197.30	98.30	23.45	0.978
12	0.96	40.80	204.30	106.90	25.50	1.090
13	1.46	80.10	251.80	88.40	21.09	0.308
14	1.52	63.40	201.40	87.60	20.89	0.477
15	1.54	64.50	202.10	103.90	24.78	0.658
16	1.52	46.00	153.70	82.90	19.77	0.772
17	1.49	48.60	165.00	94.00	22.42	0.876
18	1.50	46.90	156.20	101.80	24.28	1.124

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Influence of backpressure on spray distribution characteristics of a gas-liquid pintle injector element

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