Abstract: A new roots-type power machine was recommended. As for it, the working fluid of low pressure waste heat according was simulated to both the different operating conditions and the different intake and exhaust pressure and flow, and the changing process of internal flow field over time period using dynamic mesh technique was simulated when the power machine was in rotating work. The pressure field, velocity field and mass flow rate with the simulation results were analyzed, thus reaching the optimum operating conditions and the key parameters of the roots-type power machine. A test platform and conducted field tests was designed. As a result, the large consistency of the experimental data and simulation results illustrates the fact that numerical simulation of low-temperature conditions can be a practical means to research actual fluid machinery. It provides a new thinking in selecting appropriate roots-type power machines according to different types of waste heat in industrial production. Moreover, these efforts will provide strong theoretical guidance and foundation for the subsequent engineering practice of waste heat recovery system on roots-type power machine.

Key words: industrial low-temperature waste heat, waste heat recovery, roots-type power machine, numerical simulation, experimental study