Numerical Simulation of Gas Injection Impact on the Non-Machine Energy Separation Device

Abstract

The paper considers numerical simulation of a non-machine energy separation device with a porous inner tube. The results obtained show that with a flow rate variation up to 30% of general rate the channel efficiency of gas-dynamic non-machine device for energy separation falls by 3-5%. Hence, a heat efficiency loss due to the colder air injection prevails over the increase of heat flow resulting from a recovery factor decrease when the temperature difference between supersonic and subsonic flows rises. So, the use of gas injection (porous inner tube) to improve the efficiency of the non-machine device for energy separation is beside the purpose. The effect when the temperature changes its sign in the non-machine device for energy separation and supersonic flow becomes cooler while a subsonic one is heated has been also simulated. This effect was previously obtained experimentally. The numerical simulation has shown good coincidence with analytical solution in case of the laminar flow regime. The research has shown that with the laminar flow the efficiency of the non-machine device for energy separation can be significantly higher than with the turbulent flow, but its implementation is quite difficult.