Numerical Investigation and Analysis of Heat Transfer for Natural Gas Spray Wall-Impingement

This study presents an experimental validation of numerical model for analyzing the influence of fuel injection strategies and impingement conditions on the flow field and heat transfer characteristics of natural gas impinging spray. The flow field, temperature loss, surface heat flux and heat transfer coefficient under different influencing factors were compared to find the optimal parameters. The optimal parameters are investigated under low injection pressures (PR < 10) according to the world harmonized transient cycle to obtain data. The results of numerical model showed that the highest injection pressure and wall temperature values can maximum enhance 50.9%, and 36.7%, respectively of heat flux surface and heat transfer coefficient. However, the increase in spray-to-wall plate distance and wall temperature drop the heat transfer 16.7%, and 21.1%, respectively during the spray wall impingement process. Owing to the influence on the flow field, the turbulence intensity is considered a primary source of helping to reduce the temperature loss and heat transfer as fuel impinges onto the wall temperature surface. Moreover, this numerical simulation model could also be used to determine the optimal parameters and important variables, which can play an important role in the design of gaseous fuel spray impingement.