The relevance of the research is determined by the need to create effective gas turbine engines used in the oil and gas industry. The aim of the research is to investigate the impact of the turbine design mode on flow gas dynamics in its impeller using the model of spatial gas flow in a centripetal turbine. Object: centripetal turbine of low power energy unit applied in the oil and gas industry. Methods. Spatial flow equations are used to describe the flow in the turbine. To bring this system of equations to the system of equations in two coordinates, the method of lines is used. The obtained system of two-dimensional flow equations is solved by the method of successive approximations. Result. Based on the optimal design method, the impellers of the centripetal turbine are designed for different design pressures of gas at the inlet. The design results showed that, with the increase of the calculated gas pressure at the turbine inlet, the area of the passage section at the inlet and outlet of the impeller decreases. On the basis of one-dimensional model of the flow in turbines the influence of the height of impeller blades on the turbine efficiency and power is shown. As a result of the research, it can be stated that with the increase in the height of the impeller blade, the efficiency of the turbine grows, and the effective power decreases. The effect of the calculated gas pressure at the turbine inlet on the gas dynamics of the flow in its impeller is shown for a centripetal turbine. As a result of the studies it was found that with a decrease in the calculated gas pressure at the turbine inlet, the region of the flow separation in the impeller increases. The line of the flow separation region is determined under the condition of zero Meridian projection of the relative velocity. The experimental and calculated velocity profile at the turbine outlet is presented. Comparison of the calculated velocity profile with the experimental one allows us to conclude that the applied model for calculating the two-dimensional flow in the turbine make it possible to calculate the gas dynamics of the flow in it with high accuracy.