Study on Inlet Unstart Protection Control Method for the Solid Rocket Ramjet Engine

TANG Xiang; WANG Zhao; TIAN Xiaotao; HUANG Meng; ZHANG Bo

doi:10.15892/j.cnki.djzdxb.2025.05.012

Journal of Projectiles, Rockets, Missiles and Guidance >

2025 , Vol. 45 >Issue 5: 684 - 692

DOI: https://doi.org/10.15892/j.cnki.djzdxb.2025.05.012

Academic article

Study on Inlet Unstart Protection Control Method for the Solid Rocket Ramjet Engine

TANG Xiang ^,¹^,² ,
WANG Zhao ^,¹^,²^,^* ,
TIAN Xiaotao ¹^,² ,
HUANG Meng ¹^,² ,
ZHANG Bo ¹^,²

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¹ National Key Laboratory of Land and Air Based Information Perception and Control, Xi’an Modern Control Technology Research Institute, Xi’an 710065, Shaanxi, China
² Xi’an Modern Control Technology Research Institute, Xi’an 710065, Shaanxi, China

Received date: 2024-11-06

Online published: 2025-11-28

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Abstract

In order to fully explore the performance of the solid rocket ramjet engine,an equal-margin control method for inlet unstart protection was constructed in this paper.Firstly,the inlet unstart boundary was estimated by the steady state model of the inlet to obtain the maximum backpressure that the inlet can withstand under different flow conditions.Then,the parameters of the choked cross section were obtained by using the characteristics of the choked flow,and the inlet outlet parameters and unstart margin were obtained by using the zero-dimensional conversion equation,thus the computational model of the rocket ramjet engine was established.Finally,a unstart equal-margin control strategy was adopted to construct the double loop TD (Tracking differentiator)-PID controller to take control of the inlet unstart margin through adjusting the pressure of the gas generator,so that the optimal performance of the engine can be achieved while avoiding the inlet unstart.The simulation results show that for the square wave unstart margin command,the TD-PID controller can converge to the set value more rapidly,and reduce the steady-state relative error from 0.04% to 0.003% compared with the original PID controller,and the maximum relative negative regulation of gas flow is only 2.4%,which proves the validity of the method.

Key words： solid rocket ramjet engine; inlet unstart protection; equal-margin; TD-PID controller; without overshoot

Cite this article

TANG Xiang , WANG Zhao , TIAN Xiaotao , HUANG Meng , ZHANG Bo . Study on Inlet Unstart Protection Control Method for the Solid Rocket Ramjet Engine[J]. Journal of Projectiles, Rockets, Missiles and Guidance, 2025 , 45(5) : 684 -692 . DOI: 10.15892/j.cnki.djzdxb.2025.05.012

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