反压条件下离心喷嘴动态特性实验

doi:10.7527/S1000-6893.2022.27130

Abstract

Abstract:

The dynamic characteristics of nozzles are of critical significance to the combustion stability of liquid rocket engines. However， the lack of efficient external periodic flow pulsator， particularly in the environment of high back pressure， increases the difficulty in generating pressure and flow pulsation with strong amplitude of pipeline incoming flow. To solve these problems， a flow pulsator is developed using inertia drive to generate strong sinusoidal signals which can generate pressure amplitude up to 15% in a high back pressure environment. The flow pulsation was obtained by measuring the liquid film thickness of the swirl injector with the conductance method. The dynamic characteristics of the swirl injector at different pulsation frequencies were experimentally studied under the conditions of 0.5， 1.0 and 1.5 MPa， respectively. The results show that the increase of the back pressure has an inhibitory effect on the flow pulsation of the swirl injector. The pulsating velocity fields in different back pressure environments were obtained by cross-correlation processing of continuous spray images， and the results reveal a decreasing trend of the amplitude of the spray velocity transfer function with the increase of ambient pressure， consistent with the influence rule of back pressure on the nozzle transfer function.

Key words: flow pulsator, back pressure, dynamic characteristics, pulse flow, swirl injector

CLC Number:

V434

Qixiang GAO, Dingwei ZHANG, Lijun YANG, Qingfei FU. Experiment on dynamic characteristics of swirl injector under back pressure[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2023, 44(7): 127130.

Figures/Tables 19

Fig. 1

Fig. 2

Fig. 3

Fig. 4

Fig. 5

Fig. 6

Table 1

Geometry of experimental swirl injector

参数	$R c$ /mm	$R t$ /mm	$R k$ /mm	$L c$ /mm	n	A
数值	1	1	3.2	10	2	2.2

Table 1

Fig. 7

Fig. 8

Table 2

Uncertainty of film thickness measurement

不确定度来源	置信区间半宽度 $a$ /mm	置信系数 $k$	A类标准不确定度 $u A$ /mm	B类标准不确定度 $u B$ /mm
标定棒	0.001	$3$		0.000 6
环境因素				0
测试重复度			0.017

Table 2

Fig. 9

Fig. 10

Fig. 11

Fig. 12

Fig. 13

Fig. 14

Fig. 15

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Fig. 17

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Experiment on dynamic characteristics of swirl injector under back pressure

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