Combustion plays a key role in many industrial applications. The efficiency of combustion processes is largely determined by the accumulated experience in the field of reacting flows and experimental studies. Different modes of combustion are possible under a certain condition. Depending on a mixture composition, energy input for ignition and geometrical parameters of combustion chamber, flame propagation mode can be treated as deflagration or detonation. For a current study numerical model of gas-dynamic processes of detonation and deflagration combustion of propane-oxygen mixture based on a hybrid approach for turbulence parameters modelling is proposed. For specific cases, random flow fluctuations can lead to the emergence of local detonation cells, which significantly affect the formation of the combustion front. Traditionally Reynolds-averaged Navier–Stokes equations (RANS) or unsteady RANS (URANS) approach is widely used for flow behaviour prediction, however a significant limitations of RANS regarding the anisotropy of turbulent viscosity, can lead to discrepancy between chemical and flow interaction. Thus, approach that is more robust should be used. For current study, stress blended eddy simulation (SBES) turbulence model was chosen as a good compromise between flow resolution and required computational resources. A comparative analysis for shear stress transport turbulence model (SST) and SBES was carried out for symmetric 3d case geometry representing a combustion chamber and surrounding media. The impact from detonation /deflagration front on a free surface was compared together with the flow distribution on a chamber exit.