Pulse Detonation Engine Ignition System Research And Design

In recently decades, the Pulse Detonation Engine (PDE) has been extensively researched due to the advantages of simple structure, high thermal cycle efficiency, high thrust-weight ratio etc. In this thesis, based on the research background of ignition requirements of ignition system of Pulse Detonation Engine (PDE), an new adjustable both in ignition energy and frequency ignition system with high frequency and high output voltage was designed, which overcomes the drawbacks of conventional50Hz high voltage output supply systems, such as large volume, large weigh and low transforming efficiency. Detailed analysis and descriptions were given on the main tropolgy, controlling strategy etc. Theoretical analysis and numerical simulation methods were carried out to investigate the comprehensive research on the ignition system of PDE, while experimental method was also applied to demonstrate the rationality of control system. The work presents as follows:Firstly, development history, structure, working principles and development directions and key technologies of the pulse detonation engine (PDE) was comprehensively introduced. Detailed descriptions on the classifications of the working principles of different ignition systems was conducted, which is one of the key technologies that determines the development of pulse detonation engine. According to the ignition system ignition requirements and pulse detonation engine applications, the electric power stored energy discharge ignition system solutions was put forward, and accordingly the low voltage-high energy semiconductor sparking plug ignition system was adopted as the ultimate solution.Secondly, the main circuit topology model of low voltage-high energy semiconductor sparking plug ignition system was designed according to semiconductor ignitor discharge ignition mechanism and properties, in which the buck DC/DC converter was adopted in adjusting input voltage, and a LCC series-parallel resonant inverter with step-up transformer was applied in boosting voltage while power transistors were employed in controlling the spark frequency. Working principles of Buck chopper for regulating circuit and LCC series-parallel resonant circuit in the CCM work mode were analyzed using the fundamental wave analysis method, and the converter steady state model were deduced as well as the detailed design process and calculation method. Based on the main circuit topology, control circuits in each module of the main circuit were designed, and the design method of relevant auxiliary circuits were provided.Thirdly, numerical simulations and experiments were carried out on the basis of the designed hardware circuits. The main circuit topology model was established with simulation software Simulink, the Buck regulating circuit, LCC-SPRC inverter circuit and discharge frequency control circuit were simulated respectively. In addition, the discharge energy measurement circuit model was also designed and established; the simulation and calculation results demonstrated the validity of discharge measurement circuit in theory.Finally, according to the design of the Buck regulating circuit, LCC-SPRC inverter circuit and discharge frequency control circuit, real control circuit board were made and the circuit experiments were conducted. Experimental results revealed that the driving signals were the very correct control signals that designed previously, and hence verified the feasibility and correctness of the circuit indirectly.