发动机泵后模拟供应系统频率特性的液流激励试验

doi:10.7527/S1000-6893.2022.27419

Abstract

Abstract:

To master the frequency characteristics of the feed system after pump in a liquid rocket engine and further understand the stability problems in the development of rocket engines， a test study is carried out on the frequency response of the hydraulic excitation system of the simulated structure after pump. The hard acoustic reflection boundary of the pump and the pulsating signal source formed by combustion of the gas generator are simulated by using the acoustic closed-end device and the turntable exciter， respectively， and the frequency response characteristics of the hydraulic excitation system under forced oscillation are obtained by sweeping the frequency. The results show that in the frequency range of 30-230 Hz， the excitation source can generate artificial pressure pulsation signals with a frequency division amplitude of 0.3-1.07 MPa. There is no difference between linear and stepped frequency sweeps in identifying frequencies， but the identification amplitude of linear frequency sweeps above 100 Hz is smaller than the real amplitude at the stepped frequency sweep platform. The acoustic closed-end device has obvious frequency selectivity. In the test system where the acoustic closed-end device is installed， the frequency band with better closed-end effect accounts for 82.5% of the research frequency range and the closed-end device makes this frequency range increase by 67%， demonstrating a relatively ideal closed-end boundary of the test system. With the increase of steady-state flow， the pulsation amplitude increases， and the main circuit shows more obviously the multi-order resonance frequency characteristics of the whole system， where the first three frequencies are 36， 65 and 101 Hz. In the local subsystem with strong boundary divided by large impedance components， the frequency characteristics under this boundary are highlighted. For a purely forced excitation system， the phase lags along the excitation propagation direction in turn； the phase difference changes greatly near the resonance point， and the pulsating pressure forms a large phase difference before and after the throttle plate and the tee with a long branch.

Key words: liquid rocket engine, feed system, frequency characteristic, hydraulic excitation, acoustic closed-end

CLC Number:

V434

Meng DONG, Yonghua TAN, Chuang HE, Lixiang XING, Ruiguo ZHAO. Hydraulic excitation experiment on frequency characteristic of simulated feed system after pump in a rocket engine[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2023, 44(9): 127419-127419.

Figures/Tables 20

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参数	数值
参数	真实供应系统	模拟供应系统
介质	煤油	水
质量流量/（kg∙s^-1）	5.2 7.1 10.0	5.7 7.8 10.9
试验件压降/MPa	5.0 6.9 8.8	4.6 6.3 8.0
试验件阻抗/（10⁹Pa∙s∙m^-3）	1.61 1.62 1.47	1.61 1.62 1.47
主管路特征阻抗/（10⁸Pa∙s∙m^-3）	7.13	7.13
泵端（闭端）阻抗/（10⁹Pa∙s∙m^-3）	6.32~7.93	5.66~11.2
激励脉动压力与稳态压力之比/%	7~13	4~15
频率范围/Hz	130~170	30~230

q_m/（kg∙s^-1）	p₁/MPa	p₂/MPa	p₆/MPa	p₉/MPa
5.91	10.20	9.07	4.60	4.31
5.82	9.92	8.82	4.45	4.36
5.63	8.75	8.55	4.62	4.51
7.71	13.78	11.88	6.20	6.05
7.82	15.12	13.16	6.62	6.56
10.71	18.29	14.65	7.31	7.11
10.48	15.06	14.38	7.39	7.34

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Hydraulic excitation experiment on frequency characteristic of simulated feed system after pump in a rocket engine

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