Numerical Simulation Of HAP Three-Component Reaction Flow Field For Torpedo Thermal Power Engine

The combustion chamber is one of the most critical components for a torpedo thermodynamic system.The chemical energy of the fuel is converted into heat energy in the combustion chamber through a complex physico-chemical reaction.Most of the fuel gas produced after the full combustion reaction can reach a temperature of even more than 2500 K,which is not a problem for direct injection engines.However,to improve the underwater propulsion efficiency,the vast majority of torpedoes are connected to the turbine in the combustion chamber device,through the turbine to heat energy into mechanical energy,and then push the propeller and then promote the torpedo.Torpedo power plant turbines can withstand the operating temperature range is generally relatively low,which makes us have to be in the combustion chamber gas cooling water.In view of the above,this paper uses FLUENT commercial software to simulate the three-components HAP flow field of torpedo thermodynamic engine.The components and thermodynamic parameters of OTTO and HAP after the reaction in the combustion zone were calculated.Based on the engine output power and the requirement of cooling the gas in the combustion chamber limited by the turbine blades,the engine combustion chamber working parameters were calculated theoretically,and theoretically Of the reactant concentration and supply,through the thermal calculation of the reaction product component parameters and to achieve a reasonable cooling requirements of the amount of water.Taking advantage of FLUENT software to numerically simulate the above physical process,with the component transport model to establish the reaction and mixing model in the combustion chamber,through the DPM model to establish a water injection model to simulate the flow field inside the torch combustion chamber,and with the project The theoretical calculation value is compared and verified.The numerical simulation study was carried out on the effect of injection nozzle injection method on the flow field.The effects of the injection nozzle injection rate,the cone angle of the spray,and the average particle size of the injected water mist particles on the flow field parameters of the combustion chamber were studied.Studies have shown that under the premise of the same water injection rate,the increase of water injection speed can increase the mixing efficiency,but it must be kept within a certain limit.In a certain range,the cooling rate increases first and then decreases with the increase of the spray cone angle of the water injection nozzle.Within a certain range,changing the average particle size of the injected water mist hardly affects the combustion effect and the mixing effect of the combustion chamber.The simulation study on the effect of water injection nozzle position distribution on the flow field was carried out.The influence of the angle of injection of the water injection nozzle and the number of groups of water injection nozzles was studied,and the influence on the cooling and mixing of the combustion chamber was analyzed.Studies have shown that,compared with the injection angle of cooling water perpendicular to the wall surface,the nozzle sprayed into the combustion chamber at an angle with a larger angle of inclination is more conducive to improving the combustion efficiency,and can slightly improve the mixing effect,but the cooling rate will decrease when the inclination angle is too large.Decreased significantly.In a certain range,the more the number of nozzles,the better the mixing effect,but the mixing speed will decline slightly,and increase the complexity of the structure.