Roots compressor - High temperature testing and modeling

The Roots compressor has enjoyed a multitude of applications. Retuned to produce a high-temperature stream of gas, the Roots compressor can be a part of such applications as pyrolitic synthesis, chemical decomposition, optical fiber production and experimental studies. Presently, it appears that by using advanced materials, a prototype capable of withstanding temperatures up to 1500-2000 K could be built. A series of experiments was performed and various performance data were recorded at 2280 and 3430 rpm. The maximum steady state temperature achieved and the corresponding pressure ratio were 660 K and 3.9. Numerical modeling revealed a good correlation for pressure ratios up to 3. While the outlet pressure signature was accurately reproduced, the magnitude of the actual pressure fluctuation was somewhat in error. A more detailed physical model of gas dynamic processes could improve the agreement. The calculations were based on measurements of the internal leakage, need for modeling of which is emphasized.