Numerical Simulation Analysis Of 80kW Micro-turbine Dry Low NO_x Combustion Chamber

Gas turbines are an indispensable power plant in the world.It is a complex and intensive high-tech mechanical power equipment.It can represent the comprehensive ability of many theoretical disciplines and various engineering fields,and can significantly represent the equipment manufacturing strength of the country.The combustion chamber is one of the components of the three parts of the gas turbines for the performance index of the combustion chamber can be used as an important parameter to evaluate the performance of the gas turbine.The author researched and optimized the structure and performance of the combustion chamber,hoping to promote the overall level of gas turbines.For this thesis,the following are introduced:the gas turbine combustor;The gas turbine dry low NOx combustor and MGT80 micro gas turbine;the mechanism of NOx generation and control.Through calculation software such as FLUENT,it simulates the steady-state combustion of the MGT80 micro gas turbine combustion chamber;Analyze the performance of the MGT80 micro gas turbine combustion chamber under different powers;and through the changes on the fuel nozzle part to determine the performance and the feasibility of modification of the MGT80.The basic dimensions of each part of the combustion chamber of the MGT80 micro gas turbine are determined by the documentation.Each parts of the combustion chamber are modeled and assembled using UG mapping software.The ICEM software is used to mesh the combustion chamber,and after that,it is import into FLUENT,so that the steady combustion numerical simulation of the combustion chamber is performed.Based on those,the velocity,temperature and NOx concentration distribution of the combustion chamber are obtained,and then regulate the rated power of the chamber power to be 70%to perform the combustion simulation again.So that the temperature and NOx concentration distribution at the two powers are compared and analyzed.Modify of the combustion chamber structure,using the ICEM software to extract the MGT80 micro gas turbine combustor fuel nozzle upwards out of the nozzle itself by 1/20 unit,and then import into the FLUENT,expect to increase in fuel blends to reduce NOx.Stabilize the optimized combustion chamber again.State combustion simulation,after the distribution of velocity,temperature and NOx concentration is obtained,compare and analyze the structural changes,and found that the characteristics of the combustion chamber temperature and NOx concentration distribution remained basically unchanged after the improved design,and the optimization effect was not obvious which needs further study.