Numerical simulation of low-pressure modeling of bio-jet coal combustion

In the context of global energy demand growth and environmental pollution intensification, bio-jet coal as a clean, low-carbon, sustainable fuel, leading the future fuel development. The prototype test of an aero-engine combustion chamber is limited by practical conditions, while the low-pressure modeling test simplifies working parameters, effectively solves practical problems and meets engineering requirements. Three modeling criteria are used in this article’s low-pressure modeling numerical simulation of the combustor, which uses bio-jet as fuel. The results are compared to those computed in the original design condition. The results show that the flow field distribution predicted by the equal volume flow rate criterion (Q criterion) is the closest to the original design state, and the axial and tangential temperature field distribution is better than the equal combustion efficiency criterion (K criterion) and L criterion. Under the condition of low-pressure modeling, the combustion efficiency is reduced by 2% to 3% compared to the original design state. Especially when the pressure index is too high, the fuel flow after the L criterion is too small, and it is not suitable for aero-engine modeling test. The prediction results of the temperature distribution coefficient of the exit section show that the predicted value of the K criterion has a negative deviation compared with the original design value. The Q criterion has the smallest average error in predicting results. In conclusion, the Q criterion is the best modeling criterion, and the results of its computations can be used as a guide for the low-pressure modeling test of the combustion chamber of an aero engine.