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Scramjet engine thrust control system design

Author: GaoSong
Tutor: HeZuo；YuDaRen；BaoWen
School: Harbin Institute of Technology
Course: Control Science and Engineering
Keywords: Scramjet Thrust Measure Control Simulation
CLC: V235
Type: Master's thesis
Year: 2010
Downloads: 162
Quote: 0
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Abstract


With the constant pursuit aircraft faster, scramjet applications are increasingly widespread. Scramjet work will face a very complex environment, and the work Mach number range is very wide, so the design of an effective control system is to ensure the normal operation of the engine key. This article scramjet multi-point fuel is injected through the engine combustion, acting to provide thrust. In this paper, the scramjet engine thrust is the amount of feedback control of multi-point fuel distribution, the design of the scramjet engine thrust control system. Ground test stand with built engine thrust measurement system for the firing test. The main contents are as follows: According to the mechanism of the combustion engine to establish a one-dimensional model of the engine, including the engine precursor inlet, isolator, a combustion chamber, nozzle model, and then calculates the engine thrust. To illustrate the operating characteristics of the engine, built in Simulink model of a one-dimensional combustion chamber. Because the use of multi-point burning, so you need to consider the amount of fuel distribution points, resulting in the same fuel to obtain the maximum thrust. According to the engine thrust output stable characteristics in a very short period of time, to get under the engine thrust at different Mach fuel injection with a single point of the relationship between the amount and make the corresponding calculation and analysis. In this paper, the engine ground test stand built thrust measurement system. First introduced the test bench composed of thrust measurement principle, calculate the friction test rig. And design of the thrust signal acquisition circuit. Engine test is divided into static and dynamic mechanical analysis situations, the static case, analysis of the force and make the force calibration. Dynamic cases, an ignition test, and analyze real engine work characteristics. Based on the established engine model for control system design. Using a double-loop closed loop design. Inner loop fuel control loop is analyzed fuel valve open-loop characteristics for closed-loop control. In order to verify the effect of the control for the actual test. Outer control first analyzes the characteristics of uncompensated thrust system, and analyzes the engine of uncertainty. Design and analysis of the closed-loop controller control the outcome. In order to verify the role of the control system for the semi-physical simulation. Using DSP development board as the next controller to the PC as the control object model combustor. Simulink and CCS3.0 through the connection of the engine control loop simulation.

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CLC: > Aviation, aerospace > Aviation > Aero-engine ( propulsion system ) > Air jet engine
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