Plasma And Combustion Charateristic Research In A Novel Power System

At present, our country faces energy shortages a、 environmental degradation, and many other problems。 As an effective way to solve this situation, the development of advanced energy power system is increasingly becoming the research focus.Based on this situation, this paper proposes a new type of plasma detonation power generation system, the main research method were numerical simulation and theoretical analysis, the system focused on two core issues:partially ionized plasma propulsion characteristics under high pressure and detonation of two-dimensional simulation. This system includes entry nozzle, plasma propulsion paragraphs, detonation and MHD power generation, first of all, through the inlet nozzle section the working gas went to plasma propulsion section, by ion-neutral particles collision process, the electricity conversed to kinetic energy; Then, in the detonation section, steady detonation occurs, to efficiently release the chemical energy of fuel; Finally, the kinetic energy and heat energy was export to generate power in MHD section.In this paper, the new type of plasma-detonation power system’s working principle was analyzed. In the light of the problem of partially ionized plasma propulsion characteristics under high pressure, this paper introduced the modeling of plasma propulsion section, analyzes in detail its important assumptions, physical model, the geometric model, plasma reaction system, basic assumptions and mathematical model, the definite condition, the cathode thermal emission current, etc. The specific research content as follows:1. Entry nozzle characteristic analysis. For constant pressure、 non-constant pressure propulsion system, convergence-expansion nozzle has been two-dimensional numerical simulated, and obtained good parameters such as temperature, pressure, speed, density distribution characteristics.2. Constant pressure plasma propulsion section analysis. Variable cross-section constant pressure propulsion model is established, and the one dimensional theory is analyzed. In reference conditions and variable condition of the magnetic induction intensity、the working pressure、electronic thermal emission flow, the plasma field characteristics are analyzed, obtained the rule between the plasma field and the three variables. The constant pressure propulsion across a wide range of working point has been clearly revealed.3. Non-Constant pressure plasma propulsion section analysis. Variable cross-section non-constant pressure propulsion model is established, In reference conditions and variable condition of the magnetic induction intensity、the working pressure、electronic thermal emission flow, the plasma field characteristics are analyzed, obtained the rule between the plasma field and the three variables. At the same time, the parameters of flow and hea transfer field in plasma propulsion has been explored, shock wave and the plasma propulsion force all has affection on it. Finally, the whole energy coupling non-constant pressure plasma propulsion section was established, flow and heat transfer parameters were compared with non-pressure propulsion process. The analysis Detailed clearly reveals the non-constant pressure propulsion features across a wide range of working point.4. Detonation research. First, the international general methane-air chemical GRI Mesh reaction mechanism is simplified to one package overall reaction, and in the constant volume 0 d combustion numerical experiments, simplified reaction is proved reliable. On this basis, the convergent-expansion nozzle was established, the spatial non-uniformity of detonation heat source idea was put forward. The high temperature heat source at the exit and the high-energy source close to the exit detonated had been simulated, the simulation process successfully solved the detonation process of multidimensional modeling problem, by comparing with the conventional ZND model, proving the two-dimensional model was reliable.5. MHD power generation characteristics research. MHD power generation characteristics in different cases are analyzed, considering both output power and export pressure, the constant Mach power generation system was choose to be the best way to power generation. the paper analyzes the influence of Mach number magnetic conductivity and magnetic induction intensity on the generator characteristics, and get the rule of the two parameters and channel length.6. Power system analysis. The analysis calculated the constant pressure system, the non-constant pressure system, the whole energy coupling components of the non-constant pressure system parameters and efficiency; By analyzing the change of magnetic induction intensity of the constant pressure system features, it is concluded that the laws between the magnetic induction intensity and system efficiency. Results show that in the new type of plasma- detonation power generation system, plasma propulsion section is effective, when the system with coal-fired power units form a combined cycle, it has the advantages of high efficiency power generation.